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Takafumi Sato

Section

Advanced Institute for Materials Research

Job title

Professor

Degree

博士（理学）（東北大学）
修士（理学）（東北大学）

researchmap

https://researchmap.jp/read0191551

J-GLOBAL ID

200901050938638484

Education 3

Tohoku University　Graduate School, Division of Natural Science　Department of Physics

- 2002/03/31
Tohoku University　Graduate School, Division of Natural Science　物理学

- 1999/03/31
Tohoku University　Faculty of Science　物理学

- 1997/03/31

Committee Memberships 9

JSTさきがけ [量子物質] 領域アドバイザー

2025/05 - Present
半導体クリエイティビティハブ (全学委員会)　運営委員 (学内委員)

2024/12 - Present
JSTさきがけ [ナノマテリアル・デバイス] 領域アドバイザー

2023/06 - Present
スピントロニクス国際共同大学院(GP-Spin)　プログラム長 (学内委員)

2023/04 - Present
CSIS (全学委員会)　運営委員, 幹事 (学内委員)

2022/04 - Present
JPSJ編集委員会　編集委員

2021/04 - Present
SRIS　運営委員 (学内委員)

2021/04 - Present
日本物理学会　領域４運営委員

2013/10 - 2014/09
日本物理学会　領域４運営委員

2013/10 - 2014/09

Show all ︎Show first 5

Professional Memberships 4

日本応用物理学会
日本表面科学会
日本放射光学会
日本物理学会

Research Interests 6

トポロジカル物質
表面
強相関電子系
低次元物質
超伝導
光電子分光

Research Areas 1

Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

Awards 8

Highly Cited Researchers 2014

2014/04/01　トムソンロイター
第３回泉萩奨励賞

2011/10/01　泉萩会　高分解能光電子分光による銅酸化物及び鉄系高温超伝導体の電子状態の研究
平成21年度科学技術分野の文部科学大臣表彰若手科学者賞

2009/04/17　文部科学省　銅酸化物及び鉄系高温超伝導体の電子構造の研究
日本物理学会若手研究奨励賞

2008/03/25　日本物理学会　高分解能光電子分光装置の開発と銅酸化物超伝導体の電子構造の研究
山下太郎学術研究奨励賞

2007/06/08　財団法人山下太郎顕彰育英会　超高分解能光電子分光装置の開発と高温超伝導機構の研究
第45回原田研究奨励賞

2005/07/11　財団法人本多記念会　超高分解能光電子分光による高温超伝導体の電子状態の研究
第３回青葉理学振興会「振興会賞」

2002/03/05　青葉理学振興会　高分解能角度分解光電子分光による高温超伝導体の電子構造の研究
笹川科学研究助成金

2001/04/27　日本科学協会　極低温超高分解能角度分解光電子分光法による高温超伝導体フェルミ準位微細電子構造の研究

Show all ︎Show 5

Papers 378

Band structure of monolayer 1T-TiS2 and its implications for the phase diagrams of Ti-based transition metal dichalcogenides

Koki Yanagizawa, Katsuaki Sugawara, Tappei Kawakami, Kosuke Nakayama, Takashi Takahashi, Takafumi Sato

Physical Review B　111　(20)　2025/05/08
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.111.205111 　

ISSN： 2469-9950

eISSN： 2469-9969
Spin-valley coupling enhanced high-TC ferromagnetism in a non-van der Waals monolayer Cr2Se3 on graphene

C.-W. Chuang, T. Kawakami, K. Sugawara, K. Nakayama, S. Souma, M. Kitamura, K. Amemiya, K. Horiba, H. Kumigashira, G. Kremer, Y. Fagot-Revurat, D. Malterre, C. Bigi, F. Bertran, F. H. Chang, H. J. Lin, C. T. Chen, T. Takahashi, A. Chainani, T. Sato

Nature Communications　16　(1)　2025/04/18
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-025-58643-3 　

eISSN： 2041-1723
Experimental verification of terahertz surface plasmon resonance using the Dirac electron system Bi₂Se_xTe_(3-x)

Hinano Sugimoto, Kana Nishimura, Mayuko Takahashi, Ryo Okano, Miho Kitamura, Katsuaki Sugawara, Seigo Souma, Takafumi Sato, Masaki Kobayashi, Hitoshi Tabata

Optical Materials Express　15　(4)　788-788　2025/03/19
Publisher: Optica Publishing Group
DOI： 10.1364/ome.553139 　

eISSN： 2159-3930

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Although the surface plasmon resonance excited by a Dirac electron system has gained considerable attention in the terahertz region, studies have been limited to grating-coupling surface plasmon resonance (GC-SPR) in Bi₂Se₃. In this study, we experimentally demonstrated terahertz prism-coupled surface plasmon resonance (PC-SPR) and GC-SPR in topological insulator systems, viz. Bi₂Se₃ (GC-SPR), Bi₂Se₂Te (GC-SPR), and Bi₂Se₃ (PC-SPR). The physical properties measured using angle-resolved photoemission spectroscopy indicate that the presence of surface state near the Fermi level is insufficient for SPR excitation; linearity of the Dirac cone is essential for SPR excitation in the THz range.
Giant Rashba splitting in PtTe/PtTe2 heterostructure

Runfa Feng, Yang Zhang, Jiaheng Li, Qian Li, Changhua Bao, Hongyun Zhang, Wanying Chen, Xiao Tang, Ken Yaegashi, Katsuaki Sugawara, Takafumi Sato, Wenhui Duan, Pu Yu, Shuyun Zhou

Nature Communications　16　(1)　2025/03/18
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-025-57835-1 　

eISSN： 2041-1723

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Abstract Achieving a large spin splitting is highly desirable for spintronic devices, which often requires breaking of the inversion symmetry. However, many atomically thin films are centrosymmetric, making them unsuitable for spintronic applications. Here, we report a strategy to achieve inversion symmetry breaking from a centrosymmetric transition metal dichalcogenide (TMDC) bilayer PtTe₂, leading to a giant Rashba spin splitting. Specifically, the thermal annealing turns one layer of PtTe₂ sample into a transition metal monochalcogenide (TMMC) PtTe through Te extraction, thus forming PtTe/PtTe₂ heterostructure with inversion symmetry breaking. In this naturally-formed PtTe/PtTe₂ heterostructure, we observe a giant Rashba spin splitting with Rashba coefficient of α _R = 1.8 eV ⋅ Å, as revealed by spin- and angle-resolved photoemission spectroscopy measurements. Our work demonstrates a convenient and effective pathway for achieving pronounced Rashba splitting in centrosymmetric TMDC thin films by creating TMMC/TMDC heterostructure, thereby extending their potential applications to spintronics.
Role of spin–orbit coupling for the band splitting in α-Sb and α-Bi on SiC(0001)

Ken Yaegashi, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato

Journal of Physics: Condensed Matter　37　(13)　135501-135501　2025/02/10
Publisher: IOP Publishing
DOI： 10.1088/1361-648x/ada981 　

ISSN： 0953-8984

eISSN： 1361-648X

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Abstract Monolayer atomic thin films of group-V elements have a high potential for application in spintronics and valleytronics because of their unique crystal structure and strong spin–orbit coupling. We fabricated Sb and Bi monolayers on a SiC(0001) substrate by the molecular-beam-epitaxy method and studied the electronic structure by angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. The fabricated Sb film shows the (√3 × √3)R30° superstructure associated with the formation of α-Sb, and exhibits a semiconducting nature with a band gap of more than 1.8 eV. Spin-resolved ARPES measurements of isostructural α-Bi revealed the in-plane spin polarization for the topmost valence band, demonstrating its Rashba-splitting nature due to the space-inversion-symmetry breaking. We discuss the origin of observed characteristic band structure and its similarity and difference between Sb and Bi.
Unusual temperature dependence of the band structure associated with local atomic distortion in monolayer 1T'-WTe2

Ryuichi Ando, Katsuaki Sugawara, Tappei Kawakami, Koki Yanagizawa, Ken Yaegashi, Takashi Takahashi, Takafumi Sato

Physical Review Materials　9　(1)　2025/01/23
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevmaterials.9.l011001 　

eISSN： 2475-9953
Evolution of band structure in the kagome superconductor Cs(V1-xCrx)3Sb5: Toward universal understanding of charge density wave and superconducting phase diagrams

Shuto Suzuki, Takemi Kato, Yongkai Li, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Kenichi Ozawa, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yugui Yao, Takafumi Sato

Physical Review B　110　(16)　2024/10/15

DOI： 10.1103/PhysRevB.110.165104 　

ISSN： 2469-9950

eISSN： 2469-9969
Ferromagnetism triggered by band tripling in ruthenate Sr4Ru3 O10

N. Watanabe, S. Souma, K. Nakayama, K. Yamauchi, J. F. Ribeiro, Y. Wang, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, T. Oguchi, Z. Q. Mao, Y. P. Chen, T. Sato

Physical Review B　110　(15)　2024/10/15

DOI： 10.1103/PhysRevB.110.155134 　

ISSN： 2469-9950

eISSN： 2469-9969
Universal role of combined symmetry for the protection of the Dirac cone in antiferromagnetic topological insulators

Asuka Honma, Noriyuki Kabeya, Seigo Souma, Yongjian Wang, Kunihiko Yamauchi, Kosuke Nakayama, Daichi Takane, Kenichi Ozawa, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Tamio Oguchi, Takashi Takahashi, Noriaki Kimura, Yoichi Ando, Takafumi Sato

Physical Review B　110　(11)　2024/09/26
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.110.115152 　

ISSN： 2469-9950

eISSN： 2469-9969
In-situ topotactic chemical reaction for spectroscopies

Tappei Kawakami, Kosuke Nakayama, Katsuaki Sugawara, Takafumi Sato

Electronic Structure　2024/09/01

DOI： 10.1088/2516-1075/ad5acb 　
Selective Fabrication of Monolayer 1H- and 1T′-WTe2

Ryuichi Ando, Katsuaki Sugawara, Tappei Kawakami, Takashi Takahashi, Takafumi Sato

Journal of the Physical Society of Japan　2024/08/15

DOI： 10.7566/JPSJ.93.085002 　
Observation of edge states derived from topological helix chains

K. Nakayama, A. Tokuyama, K. Yamauchi, A. Moriya, T. Kato, K. Sugawara, S. Souma, M. Kitamura, K. Horiba, H. Kumigashira, T. Oguchi, T. Takahashi, K. Segawa, T. Sato

Nature　2024/06/05
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41586-024-07484-z 　

ISSN： 0028-0836

eISSN： 1476-4687
180 °-twisted bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>ReSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> as an artificial noncentrosymmetric semiconductor

S. Akatsuka, M. Sakano, T. Yamamoto, T. Nomoto, R. Arita, R. Murata, T. Sasagawa, K. Watanabe, T. Taniguchi, N. Mitsuishi, M. Kitamura, K. Horiba, K. Sugawara, S. Souma, T. Sato, H. Kumigashira, K. Shinokita, H. Wang, K. Matsuda, S. Masubuchi, T. Machida, K. Ishizaka

Physical Review Research　6　(2)　2024/06/03
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevresearch.6.l022048 　

eISSN： 2643-1564

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We have fabricated a 180 °-twisted bilayer ReSe2 by stacking two centrosymmetric monolayer ReSe2 flakes in opposite directions, which is expected to cause the loss of spatial inversion symmetry. We successfully observed spatial inversion-symmetry breaking, in contrast to the monolayer and natural bilayer ReSe2 by the second harmonic generation. ARPES measurements further revealed emergent band dispersions in the 180 °-twisted bilayer ReSe2, distinct from those of the monolayer ReSe2 used in its fabrication. The band calculation shows the finite lifting of spin degeneracy (∼50 meV) distinct from natural monolayer and bilayer ReSe2, which demonstrates that the spin-momentum locked state leading to Berry curvature related phenomena can be realized even with the stacking of centrosymmetric monolayers. Published by the American Physical Society 2024
Quasi‐Homoepitaxial Growth of Highly Strained Alkali‐Metal Ultrathin Films on Kagome Superconductors

Takemi Kato, Kosuke Nakayama, Yongkai Li, Zhiwei Wang, Katsuaki Sugawara, Kiyohisa Tanaka, Takashi Takahashi, Yugui Yao, Takafumi Sato

Advanced Science　2024/06/03
Publisher: Wiley
DOI： 10.1002/advs.202309003 　

ISSN： 2198-3844

eISSN： 2198-3844

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Abstract Applying lattice strain to thin films, a critical factor to tailor their properties such as stabilizing a structural phase unstable at ambient pressure, generally necessitates heteroepitaxial growth to control the lattice mismatch with substrate. Therefore, while homoepitaxy, the growth of thin film on a substrate made of the same material, is a useful method to fabricate high‐quality thin films, its application to studying strain‐induced structural phases is limited. Contrary to this general belief, here the quasi‐homoepitaxial growth of Cs and Rb thin films is reported with substantial in‐plane compressive strain. This is achieved by utilizing the alkali‐metal layer existing in bulk crystal of kagome metals AV₃Sb₅ (A = Cs and Rb) as a structural template. The angle‐resolved photoemission spectroscopy measurements reveal the formation of metallic quantum well states and notable thickness‐dependent quasiparticle lifetime. Comparison with density functional theory calculations suggests that the obtained thin films crystalize in the face‐centered cubic structure, which is typically stable only under high pressure in bulk crystals. These findings provide a useful approach for synthesizing highly strained thin films by quasi‐homoepitaxy, and pave the way for investigating many‐body interactions in Fermi liquids with tunable dimensionality.
Indication of exchange interaction induced spin splitting in unoccupied electronic states of the high-TC ferromagnet (Cr0.35Sb0.65)2Te3

C. W. Chuang, Y. Nakata, K. Hori, S. Gupta, F. M. F. de Groot, A. Fujimori, T. P. T. Nguyen, K. Yamauchi, I. Rajput, A. Lakhani, F.-H. Chang, H.-J. Lin, C.-T. Chen, F. Matsukura, S. Souma, T. Takahashi, T. Sato, A. Chainani

Physical Review B　109　(19)　2024/05/10
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.109.195134 　

ISSN： 2469-9950

eISSN： 2469-9969
Observation of a giant band splitting in altermagnetic MnTe

T. Osumi, S. Souma, T. Aoyama, K. Yamauchi, A. Honma, K. Nakayama, T. Takahashi, K. Ohgushi, T. Sato

Physical Review B　109　(11)　115102/1-115102/8　2024/03/01
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.109.115102 　

ISSN： 2469-9950

eISSN： 2469-9969
Antiferromagnetic topological insulator with selectively gapped Dirac cones

A. Honma, D. Takane, S. Souma, K. Yamauchi, Y. Wang, K. Nakayama, K. Sugawara, M. Kitamura, K. Horiba, H. Kumigashira, K. Tanaka, T. K. Kim, C. Cacho, T. Oguchi, T. Takahashi, Yoichi Ando, T. Sato

Nature Communications　14　(1)　2023/11/17
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-023-42782-6 　

eISSN： 2041-1723

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Abstract Antiferromagnetic (AF) topological materials offer a fertile ground to explore a variety of quantum phenomena such as axion magnetoelectric dynamics and chiral Majorana fermions. To realize such intriguing states, it is essential to establish a direct link between electronic states and topology in the AF phase, whereas this has been challenging because of the lack of a suitable materials platform. Here we report the experimental realization of the AF topological-insulator phase in NdBi. By using micro-focused angle-resolved photoemission spectroscopy, we discovered contrasting surface electronic states for two types of AF domains; the surface having the out-of-plane component in the AF-ordering vector displays Dirac-cone states with a gigantic energy gap, whereas the surface parallel to the AF-ordering vector hosts gapless Dirac states despite the time-reversal-symmetry breaking. The present results establish an essential role of combined symmetry to protect massless Dirac fermions under the presence of AF order and widen opportunities to realize exotic phenomena utilizing AF topological materials.
Moiré‐Assisted Realization of Octahedral MoTe₂ Monolayer

Yasuaki Saruta, Katsuaki Sugawara, Hirofumi Oka, Tappei Kawakami, Takemi Kato, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Tomoteru Fukumura, Takafumi Sato

Advanced Science　2023/10/22
Publisher: Wiley
DOI： 10.1002/advs.202304461 　

ISSN： 2198-3844

eISSN： 2198-3844

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Abstract A current key challenge in 2D materials is the realization of emergent quantum phenomena in hetero structures via controlling the moiré potential created by the periodicity mismatch between adjacent layers, as highlighted by the discovery of superconductivity in twisted bilayer graphene. Generally, the lattice structure of the original host material remains unchanged even after the moiré superlattice is formed. However, much less attention is paid for the possibility that the moiré potential can also modify the original crystal structure itself. Here, it is demonstrated that octahedral MoTe₂ which is unstable in bulk is stabilized in a commensurate MoTe₂/graphene hetero‐bilayer due to the moiré potential created between the two layers. It is found that the reconstruction of electronic states via the moiré potential is responsible for this stabilization, as evidenced by the energy‐gap opening at the Fermi level observed by angle‐resolved photoemission and scanning tunneling spectroscopies. The present results provide a fresh approach to realize novel 2D quantum phases by utilizing the moiré potential.
Switching of charge-density wave by carrier tuning in monolayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">TiTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Koki Yanagizawa, Katsuaki Sugawara, Tappei Kawakami, Ryuichi Ando, Ken Yaegashi, Kosuke Nakayama, Seigo Souma, Kiyohisa Tanaka, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Takafumi Sato

Physical Review Materials　7　(10)　2023/10/18
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevmaterials.7.104002 　

eISSN： 2475-9953
Unusual surface states associated with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="script">PT</mml:mi></mml:math> -symmetry breaking and antiferromagnetic band folding in NdSb

Asuka Honma, Daichi Takane, Seigo Souma, Yongjian Wang, Kosuke Nakayama, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yoichi Ando, Takafumi Sato

Physical Review B　108　(11)　2023/09/11
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.108.115118 　

ISSN： 2469-9950

eISSN： 2469-9969
Pure nematic state in the iron-based superconductor FeSe

Y. Kubota, F. Nabeshima, K. Nakayama, H. Ohsumi, Yoshikazu Tanaka, K. Tamasaku, T. Suzuki, K. Okazaki, T. Sato, A. Maeda, M. Yabashi

Physical Review B　108　(10)　2023/09/05
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.108.l100501 　

ISSN： 2469-9950

eISSN： 2469-9969
Surface-termination-dependent electronic states in kagome superconductors AV3Sb5 (A=K, Rb, Cs) studied by micro-ARPES

Takemi Kato, Yongkai Li, Min Liu, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yugui Yao, Takafumi Sato

Physical Review B　107　(24)　2023/06/29
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.107.245143 　

ISSN： 2469-9950

eISSN： 2469-9969
Visualizing crystal twin boundaries of bismuth by high-spatial-resolution ARPES

Ayumi Moriya, Kosuke Nakayama, Tappei Kawakami, Kensaku Maeda, Atsuya Tokuyama, Seigo Souma, Chaoyu Chen, José Avila, Maria Carmen Asensio, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Kozo Fujiwara, Kouji Segawa, Takafumi Sato

Physical Review Research　5　(2)　2023/06/06
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevresearch.5.023152 　

eISSN： 2643-1564
Charge-density wave associated with higher-order Fermi-surface nesting in monolayer VS2

Tappei Kawakami, Katsuaki Sugawara, Hirofumi Oka, Kosuke Nakayama, Ken Yaegashi, Seigo Souma, Takashi Takahashi, Tomoteru Fukumura, Takafumi Sato

npj 2D Materials and Applications　7　(1)　2023/05/02
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41699-023-00395-z 　

eISSN： 2397-7132

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Abstract Fermi-surface (FS) nesting originating from Peierls’ idea of electronic instabilities in one-dimensional materials is a key concept to stabilize charge-density wave (CDW), whereas its applicability to two-dimensional (2D) materials is under intensive debate. Here we report unusual CDW associated with the higher-order FS nesting in monolayer 2D VS2. Angle-resolved photoemission spectroscopy and scanning tunneling microscopy uncovered stripe CDW with $$\sqrt {21} R10.9^\circ \times \sqrt 3 R30^\circ$$ periodicity together with an energy-gap opening on the entire FS. We suggest that this CDW involves the higher-order FS-nesting vector 2q twice larger than that of the normal one (q), as supported by the anomalies in the calculated phonon dispersion and electronic susceptibility. The present results suggest that the cooperation of q and 2q nesting leads to the fully gapped CDW state unlike the case of conventional single q nesting which produces a partial gap, pointing to an intriguing mechanism of CDW transition.
Exhaustive Analysis of Angle-resolved Photoemission Spectra Based on Bayesian Inference

Satoru TOKUDA, Takeshi NAKANISHI, Takafumi SATO

Vacuum and Surface Science　66　(3)　152-157　2023/03/10
Publisher: Surface Science Society Japan
DOI： 10.1380/vss.66.152 　

ISSN： 2433-5835

eISSN： 2433-5843
Direct Imaging of Band Structure for Powdered Rhombohedral Boron Monosulfide by Microfocused ARPES

Katsuaki Sugawara, Haruki Kusaka, Tappei Kawakami, Koki Yanagizawa, Asuka Honma, Seigo Souma, Kosuke Nakayama, Masashi Miyakawa, Takashi Taniguchi, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Shin-ichi Orimo, Masayuki Toyoda, Susumu Saito, Takahiro Kondo, Takafumi Sato

Nano Letters　23　(5)　1673-1679　2023/02/27
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.nanolett.2c04048 　

ISSN： 1530-6984

eISSN： 1530-6992
Charge order with unusual star-of-David lattice in monolayer NbTe2

Taiki Taguchi, Katsuaki Sugawara, Hirofumi Oka, Tappei Kawakami, Yasuaki Saruta, Takemi Kato, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Tomoteru Fukumura, Takafumi Sato

Physical Review B　107　(4)　2023/01/17
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.107.l041105 　

ISSN： 2469-9950

eISSN： 2469-9969
Fermiology and Origin of Tc Enhancement in a Kagome Superconductor Cs (V1-xNbx)3Sb5

Takemi Kato, Yongkai Li, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Fumihiko Matsui, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yugui Yao, Takafumi Sato

Physical Review Letters　129　(20)　2022/11/11

DOI： 10.1103/PhysRevLett.129.206402 　

ISSN： 0031-9007

eISSN： 1079-7114
Selective Fabrication of Bismuthene and α-Bi on Hydrogen-Terminated SiC(0001)

Ken Yaegashi, Katsuaki Sugawara, Takemi Kato, Takashi Takahashi, Takafumi Sato

Langmuir　38　(44)　13401-13406　2022/10/28
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.langmuir.2c01678 　

ISSN： 0743-7463

eISSN： 1520-5827
Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity: Angle-resolved photoemission study

Chien Wen Chuang, Seigo Souma, Ayumi Moriya, Kosuke Nakayama, Atsutoshi Ikeda, Mayo Kawaguchi, Keito Obata, Shanta Ranjan Saha, Hidemitsu Takahashi, Shunsaku Kitagawa, Kenji Ishida, Kiyohisa Tanaka, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Shingo Yonezawa, Johnpierre Paglione, Yoshiteru Maeno, Takafumi Sato

Physical Review Materials　6　(10)　2022/10

DOI： 10.1103/PhysRevMaterials.6.104203 　

eISSN： 2475-9953
Polarity-dependent charge density wave in the kagome superconductor CsV3Sb5

Takemi Kato, Yongkai Li, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Takafumi Sato

Physical Review B　106　(12)　2022/09/15

DOI： 10.1103/PhysRevB.106.L121112 　

ISSN： 2469-9950

eISSN： 2469-9969
Angle-resolved photoemission spectroscopy

Hongyun Zhang, Tommaso Pincelli, Chris Jozwiak, Takeshi Kondo, Ralph Ernstorfer, Takafumi Sato, Shuyun Zhou

Nature Reviews Methods Primers　2　(1)　2022/07/14
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s43586-022-00133-7 　

eISSN： 2662-8449
Rhombic Fermi surfaces in a ferromagnetic MnGa thin film with perpendicular magnetic anisotropy

M. Kobayashi, N. H. D. Khang, T. Takeda, K. Araki, R. Okano, M. Suzuki, K. Kuroda, K. Yaji, K. Sugawara, S. Souma, K. Nakayama, K. Yamauchi, M. Kitamura, K. Horiba, A. Fujimori, T. Sato, S. Shin, M. Tanaka, P. N. Hai

Physical Review Materials　2022/07

DOI： 10.1103/physrevmaterials.6.074403 　

ISSN： 2475-9953
Three-dimensional energy gap and origin of charge-density wave in kagome superconductor KV3Sb5

Takemi Kato, Yongkai Li, Tappei Kawakami, Min Liu, Kosuke Nakayama, Zhiwei Wang, Ayumi Moriya, Kiyohisa Tanaka, Takashi Takahashi, Yugui Yao, Takafumi Sato

Communications Materials　3　(1)　2022/05
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s43246-022-00255-1 　

eISSN： 2662-4443

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Abstract Kagome lattices offer a fertile ground to explore exotic quantum phenomena associated with electron correlation and band topology. The recent discovery of superconductivity coexisting with charge-density wave (CDW) in the kagome metals KV₃Sb₅, RbV₃Sb₅, and CsV₃Sb₅ suggests an intriguing entanglement of electronic order and superconductivity. However, the microscopic origin of CDW, a key to understanding the superconducting mechanism and its possible topological nature, remains elusive. Here, we report angle-resolved photoemission spectroscopy of KV₃Sb₅ and demonstrate a substantial reconstruction of Fermi surface in the CDW state that accompanies the formation of small three-dimensional pockets. The CDW gap exhibits a periodicity of undistorted Brillouin zone along the out-of-plane wave vector, signifying a dominant role of the in-plane inter-saddle-point scattering to the mechanism of CDW. The characteristics of experimental band dispersion can be captured by first-principles calculations with the inverse star-of-David structural distortion. The present result indicates a direct link between the low-energy excitations and CDW, and puts constraints on the microscopic theory of superconductivity in alkali-metal kagome lattices.
Pb/Bi heterostructure as a versatile platform to realize topological superconductivity

Ikuko Watanabe, Seigo Souma, Kosuke Nakayama, Katsuaki Sugawara, Chi Xuan Trang, Kouji Segawa, Kunihiko Yamauchi, Tamio Oguchi, Takashi Takahashi, Takafumi Sato

Progress of Theoretical and Experimental Physics　2022　(4)　2022/04/07
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptab105 　

eISSN： 2050-3911

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Abstract Realization of topological superconductors (TSCs) hosting Majorana fermions is an exciting challenge in materials science. Majorana fermions are predicted to emerge at vortex cores of two-dimensional (2D) TSCs and at both ends of one-dimensional (1D) TSCs; these two types of TSCs have been explored independently in different materials. Here, a system which has a potential to access both 1D and 2D TSCs in a single platform, Pb(111)/Bi(111) heterostructure, is proposed. One to twenty bilayers (BLs) of Bi(111) ultra-thin films are epitaxially fabricated on TlBiSe$_2$, and an intriguing evolution of electronic states upon variation of Bi-layer thickness is revealed by angle-resolved photoemission spectroscopy. The metallic quantum-well states at 1–2BLs are found to turn into the Rashba states at 5–20BLs, via the semiconducting states at 3BL. Fabrication of a Pb(111) film on 20BL Bi(111) enables observation of the proximity-induced superconductivity in Bi(111) as evident from a 1 meV energy gap at 5 K; these energy and temperature scales are considerably larger than those of Rashba superconductors. The Pb/Bi heterostructure serves as a versatile platform to study the interplay among proximity-induced superconductivity, band structure, and topology.
Development of a versatile micro-focused angle-resolved photoemission spectroscopy system with Kirkpatrick-Baez mirror optics

Miho Kitamura, Seigo Souma, Asuka Honma, Daisuke Wakabayashi, Hirokazu Tanaka, Akio Toyoshima, Kenta Amemiya, Tappei Kawakami, Katsuaki Sugawara, Kosuke Nakayama, Kohei Yoshimatsu, Hiroshi Kumigashira, Takafumi Sato, Koji Horiba

Review of Scientific Instruments　93　(3)　2022/03/01

DOI： 10.1063/5.0074393 　

ISSN： 0034-6748

eISSN： 1089-7623
Carrier Injection and Manipulation of Charge-Density Wave in Kagome Superconductor CsV3Sb5

Kosuke Nakayama, Yongkai Li, Takemi Kato, Min Liu, Zhiwei Wang, Takashi Takahashi, Yugui Yao, Takafumi Sato

Physical Review X　12　(1)　2022/01/03
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevx.12.011001 　

eISSN： 2160-3308
Dirac semimetal phase and switching of band inversion in XMg<inf>2</inf>Bi<inf>2</inf> (X = Ba and Sr)

Daichi Takane, Yuya Kubota, Kosuke Nakayama, Tappei Kawakami, Kunihiko Yamauchi, Seigo Souma, Takemi Kato, Katsuaki Sugawara, Shin ichiro Ideta, Kiyohisa Tanaka, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Tamio Oguchi, Takashi Takahashi, Kouji Segawa, Takafumi Sato

Scientific Reports　11　(1)　2021/12

DOI： 10.1038/s41598-021-01333-z 　

eISSN： 2045-2322
Unveiling quasiparticle dynamics of topological insulators through Bayesian modelling

Satoru Tokuda, Seigo Souma, Kouji Segawa, Takashi Takahashi, Yoichi Ando, Takeshi Nakanishi, Takafumi Sato

Communications Physics　4　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s42005-021-00673-6 　

eISSN： 2399-3650

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<title>Abstract</title>Quasiparticle - a key concept to describe interacting particles - characterizes electron-electron interaction in metals (Fermi liquid) and electron pairing in superconductors. While this concept essentially relies on the simplification of hard-to-solve many-body problem into one-particle picture and residual effects, a difficulty in disentangling many-body effects from experimental quasiparticle signature sometimes hinders unveiling intrinsic low-energy dynamics, as highlighted by the fierce controversy on the origin of Dirac-band anomaly in graphene and dispersion kink in high-temperature superconductors. Here, we propose an approach to solve this fundamental problem - the Bayesian modelling of quasiparticles. We have chosen a topological insulator TlBi(S,Se)₂ as a model system to formulate an inverse problem of quasiparticle spectra with semiparametric Bayesian analysis, and successfully extracted one-particle and many-body characteristics, i.e. the intrinsic energy gap and unusual lifetime in Dirac-quasiparticle bands. Our approach is widely applicable to clarify the quasiparticle dynamics of quantum materials.
Multiple energy scales and anisotropic energy gap in the charge-density-wave phase of the kagome superconductor CsV3Sb5

Kosuke Nakayama, Yongkai Li, Takemi Kato, Min Liu, Zhiwei Wang, Takashi Takahashi, Yugui Yao, Takafumi Sato

Physical Review B　104　(16)　2021/10/21
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.104.l161112 　

ISSN： 2469-9950

eISSN： 2469-9969
Large magnetoresistance of a compensated metal Cu2Sb correlated with its Fermi surface topology

Mizuki Endo, Hideyuki Kawasoko, Seigo Soma, Kunihiko Yamauchi, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Noriaki Kimura, Tamio Oguchi, Takafumi Sato, Tomoteru Fukumura

Physical Review Materials　5　(10)　2021/10/06
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevmaterials.5.105002 　

eISSN： 2475-9953
Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2

Yuki Nakata, Katsuaki Sugawara, Ashish Chainani, Hirofumi Oka, Changhua Bao, Shaohua Zhou, Pei-Yu Chuang, Cheng-Maw Cheng, Tappei Kawakami, Yasuaki Saruta, Tomoteru Fukumura, Shuyun Zhou, Takashi Takahashi, Takafumi Sato

NATURE COMMUNICATIONS　12　(1)　2021/10

DOI： 10.1038/s41467-021-26105-1 　

eISSN： 2041-1723
Electronic states of multilayer VTe2: Quasi-one-dimensional Fermi surface and implications for charge density waves

Tappei Kawakami, Katsuaki Sugawara, Takemi Kato, Taiki Taguchi, Seigo Souma, Takashi Takahashi, Takafumi Sato

PHYSICAL REVIEW B　104　(4)　2021/07

DOI： 10.1103/PhysRevB.104.045136 　

ISSN： 2469-9950

eISSN： 2469-9969
Unveiling quasiparticle dynamics of topological insulators through Bayesian modelling

Satoru Tokuda, Seigo Souma, Kouji Segawa, Takashi Takahashi, Yoichi Ando, Takeshi Nakanishi, Takafumi Sato

COMMUNICATIONS PHYSICS　4　(1)　2021/07

DOI： 10.1038/s42005-021-00673-6 　

ISSN： 2399-3650
Manipulation of Dirac Cone in Topological Insulator/Topological Insulator Heterostructure

Takumi Sato, Katsuaki Sugawara, Takemi Kato, Yuki Nakata, Seigo Souma, Kunihiko Yamauchi, Tamio Oguchi, Takashi Takahashi, Takafumi Sato

ACS Applied Electronic Materials　3　(3)　1080-1085　2021/03/23

DOI： 10.1021/acsaelm.0c00918 　

ISSN： 2637-6113

eISSN： 2637-6113
Highly Tunable Near‐Room Temperature Ferromagnetism in Cr‐Doped Layered Td‐WTe 2

Li Yang, Hao Wu, Liang Zhang, Wenfeng Zhang, Luying Li, Tappei Kawakami, Katsuaki Sugawara, Takafumi Sato, Gaojie Zhang, Pengfei Gao, Younis Muhammad, Xiaokun Wen, Boran Tao, Fei Guo, Haixin Chang

Advanced Functional Materials　31　(13)　2008116-2008116　2021/03
Publisher: Wiley
DOI： 10.1002/adfm.202008116 　

ISSN： 1616-301X

eISSN： 1616-3028
Unusual Temperature Evolution of Quasiparticle Band Dispersion in Electron-Doped FeSe Films

Kosuke Nakayama, Koshin Shigekawa, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato

Symmetry　13　(2)　155-155　2021/01/20
Publisher: MDPI AG
DOI： 10.3390/sym13020155 　

eISSN： 2073-8994

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The discovery of high-temperature (high-Tc) superconductivity in one-monolayer FeSe on SrTiO3 has attracted tremendous attention. Subsequent studies suggested the importance of cooperation between intra-FeSe-layer and interfacial interactions to enhance Tc. However, the nature of intra-FeSe-layer interactions, which would play a primary role in determining the pairing symmetry, remains unclear. Here we have performed high-resolution angle-resolved photoemission spectroscopy of one-monolayer and alkaline-metal-deposited multilayer FeSe films on SrTiO3, and determined the evolution of quasiparticle band dispersion across Tc. We found that the band dispersion in the superconducting state deviates from the Bogoliubov-quasiparticle dispersion expected from the normal-state band dispersion with a constant gap size. This suggests highly anisotropic pairing originating from small momentum transfer and/or mass renormalization due to electron–boson coupling. This band anomaly is interpreted in terms of the electronic interactions within the FeSe layers that may be related to the high-Tc superconductivity in electron-doped FeSe.
Orbital mixing at the onset of high-temperature superconductivity in FeSe1−xTex/CaF2

K. Nakayama, R. Tsubono, G. N. Phan, F. Nabeshima, N. Shikama, T. Ishikawa, Y. Sakishita, S. Ideta, K. Tanaka, A. Maeda, T. Takahashi, T. Sato

Physical Review Research　3　(1)　2021/01/20
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevresearch.3.l012007 　

eISSN： 2643-1564
Conversion of a conventional superconductor into a topological superconductor by topological proximity effect Peer-reviewed

C. X. Trang, N. Shimamura, K. Nakayama, S. Souma, K. Sugawara, I. Watanabe, K. Yamauchi, T. Oguchi, K. Segawa, T. Takahashi, Yoichi Ando, T. Sato

Nature Communications　11　(1)　2020/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-019-13946-0 　

eISSN： 2041-1723
Signature of band inversion in the antiferromagnetic phase of axion insulator candidate EuIn2As2

Takafumi Sato, Zhiwei Wang, Daichi Takane, Seigo Souma, Chaoxi Cui, Yongkai Li, Kosuke Nakayama, Tappei Kawakami, Yuya Kubota, Cephise Cacho, Timur K. Kim, Arian Arab, Vladimir N. Strocov, Yugui Yao, Takashi Takahashi

Physical Review Research　2　(3)　2020/09/01

DOI： 10.1103/physrevresearch.2.033342 　

eISSN： 2643-1564
Modulation of Dirac electrons in epitaxial Bi2Se3 ultrathin films on van der Waals ferromagnet Cr2Si2Te6 Peer-reviewed

Takemi Kato, Katsuaki Sugawara, Naohiro Ito, Kunihiko Yamauchi, Takumi Sato, Tamio Oguchi, Takashi Takahashi, Yuki Shiomi, Eiji Saitoh, Takafumi Sato

Physical Review Materials　4　(8)　2020/08/12

DOI： 10.1103/physrevmaterials.4.084202 　

ISSN： 2475-9953

eISSN： 2475-9953
Unusual temperature evolution of the band structure of Bi(111) studied by angle-resolved photoemission spectroscopy and density functional theory Peer-reviewed

Takafumi Sato, Keiko Yamada, Takao Kosaka, Seigo Souma, Kunihiko Yamauchi, Katsuaki Sugawara, Tamio Oguchi, Takashi Takahashi

Physical Review B　102　(8)　2020/08/06

DOI： 10.1103/physrevb.102.085112 　

ISSN： 2469-9950

eISSN： 2469-9969
Observation of inverted band structure in the topological Dirac semimetal candidate CaAuAs Peer-reviewed

Kosuke Nakayama, Zhiwei Wang, Daichi Takane, Seigo Souma, Yuya Kubota, Yuki Nakata, Cephise Cacho, Timur Kim, Sandy Adhitia Ekahana, Ming Shi, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yoichi Ando, Takafumi Sato

Physical Review B　102　(4)　2020/07/06
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.102.041104 　

ISSN： 2469-9950

eISSN： 2469-9969
Two-dimensional growth of conductive ultra-thin Sn films on insulating substrate with an Fe buffer layer International-journal Peer-reviewed

Dingheng Zheng, Junichi Shiogai, Hisashi Inoue, Seigo Souma, Takafumi Sato, Atsushi Tsukazaki

APL Materials　8　(6)　061103-1-061103-7　2020/06/04

DOI： 10.1063/5.0009012 　

ISSN： 2166-532X
Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)2Se3 heterostructures Peer-reviewed

Y. Satake, J. Shiogai, G. P. Mazur, S. Kimura, S. Awaji, K. Fujiwara, T. Nojima, K. Nomura, S. Souma, T. Sato, T. Dietl, A. Tsukazaki

Physical Review Materials　4　(4)　2020/04/21
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevmaterials.4.044202 　

eISSN： 2475-9953
Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCoO2 ultrathin films Peer-reviewed

T. Harada, K. Sugawara, K. Fujiwara, M. Kitamura, S. Ito, T. Nojima, K. Horiba, H. Kumigashira, T. Takahashi, T. Sato, A. Tsukazaki

Physical Review Research　2　(1)　013282　2020/03/09
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevresearch.2.013282 　

eISSN： 2643-1564
Dichotomy of superconductivity between monolayer FeS and FeSe Peer-reviewed

Koshin Shigekawa, Kosuke Nakayama, Masato Kuno, Giao N. Phan, Kenta Owada, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato

Proceedings of the National Academy of Sciences　116　(49)　24470-24474　2019/12/03
Publisher: Proceedings of the National Academy of Sciences
DOI： 10.1073/pnas.1912836116 　

ISSN： 0027-8424

eISSN： 1091-6490

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The discovery of high-temperature (<italic>T</italic>_c) superconductivity in monolayer FeSe on SrTiO₃ raised a fundamental question: Whether high <italic>T</italic>_c is commonly realized in monolayer iron-based superconductors. Tetragonal FeS is a key material to resolve this issue because bulk FeS is a superconductor with <italic>T</italic>_c comparable to that of isostructural FeSe. However, difficulty in synthesizing tetragonal monolayer FeS due to its metastable nature has hindered further investigations. Here we report elucidation of band structure of monolayer FeS on SrTiO₃, enabled by a unique combination of in situ topotactic reaction and molecular-beam epitaxy. Our angle-resolved photoemission spectroscopy on FeS and FeSe revealed marked similarities in the electronic structure, such as heavy electron doping and interfacial electron–phonon coupling, both of which have been regarded as possible sources of high <italic>T</italic>_c in FeSe. However, surprisingly, high-<italic>T</italic>_c superconductivity is absent in monolayer FeS. This is linked to the weak superconducting pairing in electron-doped multilayer FeS in which the interfacial effects are absent. Our results strongly suggest that the cross-interface electron–phonon coupling enhances <italic>T</italic>_c only when it cooperates with the pairing interaction inherent to the superconducting layer. This finding provides a key insight to explore heterointerface high-<italic>T</italic>_c superconductors.
Unusual change in the Dirac-cone energy band upon a two-step magnetic transition in CeBi Peer-reviewed

Oinuma Hikaru, Souma Seigo, Nakayama Kosuke, Horiba Koji, Kumigashira Hiroshi, Yoshida Makoto, Ochiai Akira, Takahashi Takashi, Sato Takafumi

PHYSICAL REVIEW B　100　(12)　2019/09/10

DOI： 10.1103/PhysRevB.100.125122 　

ISSN： 2469-9950
Electronic structure of a Bi2Te3/FeTe heterostructure: Implications for unconventional superconductivity Peer-reviewed

Kenta Owada, Kosuke Nakayama, Ryuji Tsubono, Koshin Shigekawa, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato

Physical Review B　100　(6)　2019/08/21
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.100.064518 　

ISSN： 2469-9950

eISSN： 2469-9969
Dimensionality reduction and band quantization induced by potassium intercalation in 1T-HfTe2 Peer-reviewed

Y. Nakata, K. Sugawara, A. Chainani, K. Yamauchi, K. Nakayama, S. Souma, P.-Y. Chuang, C.-M. Cheng, T. Oguchi, K. Ueno, T. Takahashi, T. Sato

PHYSICAL REVIEW MATERIALS　3　071001(R)　2019/07
Monolayer VTe2: Incommensurate Fermi surface nesting and suppression of charge density waves Peer-reviewed

Katsuaki Sugawara, Yuki Nakata, Kazuki Fujii, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Takafumi Sato

PHYSICAL REVIEW B　99　241404(R)　2019/06
Evidence for bulk nodal loops and universality of Dirac-node arc surface statesin ZrGeXc (Xc=S, Se, Te) Peer-reviewed

Takechika Nakamura, Seigo Souma, Zhiwei Wang, Kunihiko Yamauchi, Daichi Takane, Hikaru Oinuma, Kosuke Nakayama, Koji Horiba, Hiroshi Kumigashira, Tamio Oguchi, Takashi Takahashi, Yoichi Ando, Takafumi Sato

PHYSICAL REVIEW B　99　245105　2019/06
Nanomosaic of Topological Dirac States on the Surface ofPb5Bi24Se41 Observed by Nano-ARPES Peer-reviewed

Kosuke Nakayama, Seigo Souma, Chi Xuan Trang, Daichi Takane, Chaoyu Chen, Jose Avila, Takashi Takahashi, Satoshi Sasaki, Kouji Segawa, Maria Carmen Asensio, Yoichi Ando, Takafumi Sato

Nano Letters　19　3737　2019/04
Observation of Chiral Fermions with a Large Topological Chargeand Associated Fermi-Arc Surface States in CoSi Peer-reviewed

Daichi Takane, Zhiwei Wang, Seigo Souma, Kosuke Nakayama, Takechika Nakamura, Hikaru Oinuma, Yuki Nakata, Hideaki Iwasawa, Cephise Cacho, Timur Kim, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yoichi Ando, Takafumi Sato

Physical Review Letters　122　076402　2019/02
Ultrathin Bismuth Film on High-Temperature Cuprate Superconductor Bi2Sr2CaCu2O8+d as a Candidate of a Topological Superconductor Peer-reviewed

Natsumi Shimamura, Katsuaki Sugawara, Sukrit Sucharitakul, Seigo Souma, Katsuya Iwaya, Kosuke Nakayama, Chi Xuan Trang, Kunihiko Yamauchi, Tamio Oguchi, Kazutaka Kudo, Takashi Noji, Yoji Koike, Takashi Takahashi, Tetsuo Hanaguri, Takafumi Sato

ACS Nano　12　10977-10983　2018/10
Observation of Dirac-like energy band and unusual spectral line shape in quasi-one-dimensionalsuperconductor Tl2Mo6Se6 Peer-reviewed

Kosuke Nakayama, Zhiwei Wang, Chi Xuan Trang, Seigo Souma, Emile D. L. Rienks, Takashi Takahashi, Yoichi Ando, Takafumi Sato

PHYSICAL REVIEW B　98　140502　2018/10
Pseudogap, Fermi arc, and Peierls-insulating phase induced by 3D–2D crossover in monolayer VSe2 Peer-reviewed

Yuki Umemoto, Katsuaki Sugawara, Yuki Nakata, Takashi Takahashi, Takafumi Sato

Nano Research　12　165-169　2018/09
Observation of a Dirac nodal line in AlB2 Peer-reviewed

Takane Daichi, Souma Seigo, Nakayama Kosuke, Nakamura Takechika, Oinuma Hikaru, Hori Kentaro, Horiba Kouji, Kumigashira Hiroshi, Kimura Noriaki, Takahashi Takashi, Sato Takafumi

PHYSICAL REVIEW B　98　(4)　2018/07/17

DOI： 10.1103/PhysRevB.98.041105 　

ISSN： 2469-9950
Observation of band crossings protected by nonsymmorphic symmetry in the layered ternary telluride Ta3SiTe6 Peer-reviewed

Takafumi Sato, Zhiwei Wang, Kosuke Nakayama, Seigo Souma, Daichi Takane, Yuki Nakata, Hideaki Iwasawa, Cephise Cacho, Timur Kim, Takashi Takahashi, Yoichi Ando

PHYSICAL REVIEW B　98　121111　2018/07
Ultrathin Bismuth Film on 1T-TaS2: Structural Transition and Charge-Density-Wave Proximity Effect Peer-reviewed

Keiko Yamada, Seigo Souma, Kunihiko Yamauchi, Natsumi Shimamura, Katsuaki Sugawara, Chi Xuan Trang, Tamio Oguchi, Keiji Ueno, Takashi Takahashi, Takafumi Sato

Nano Letters　18　(5)　3235-3240　2018/05/09

DOI： 10.1021/acs.nanolett.8b01003 　

ISSN： 1530-6992 1530-6984
Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave Peer-reviewed

Yuki Nakata, Katsuaki Sugawara, Satoru Ichinokura, Yoshinori Okada, Taro Hitosugi, Takashi Koretsune, Keiji Ueno, Shuji Hasegawa, Takashi Takahashi, Takafumi Sato

npj 2D Materials and Applications　2　12　2018/05
Temperature insensitivity of Fermi surface inelectron-doped high-temperature FeSe films on SrTiO3 Peer-reviewed

K. Shigekawa, K. Nakayama, G. N. Phan, M. Kuno, K. Sugawara, T. Takahashi, T. Sato

Journal of Physics: Conf. Series　1054　012019　2018/04
Selective Fabrication of Mott-Insulating and Metallic Monolayer TaSe2 Peer-reviewed

Y. Nakata, T. Yoshizawa, K. Sugawara, Y. Umemoto, T. Takahashi, T. Sato

ACS Appl. Nano Mater.　1　1456-1460　2018/03
Selective fabrication of free-standing ABA and ABC trilayer graphene with/without Dirac-cone energy bands Peer-reviewed

Sugawara Katsuaki, Yamamura Norifumi, Matsuda Keita, Norimatsu Wataru, Kusunoki Michiko, Sato Takafumi, Takahashi Takashi

NPG ASIA MATERIALS　10　2018/02/09

DOI： 10.1038/am.2017.238 　

ISSN： 1884-4049

eISSN： 1884-4057
Fermi-level tuning of the Dirac surface state in (Bi1-xSbx)2Se3 thin films Peer-reviewed

Yosuke Satake, Junichi Shiogai, Daichi Takane, Keiko Yamada, Kohei Fujiwara, Seigo Souma, Takafumi Sato, Takashi Takahashi, Atsushi Tsukazaki

Journal of Physics Condensed Matter　30　(8)　2018/02/01

DOI： 10.1088/1361-648X/aaa724 　

ISSN： 1361-648X 0953-8984
Observation of Dirac-like energy band in CaAgAs studied by soft x-ray ARPES

Takane D., Horiba K., Kumigashira H., Takahashi T., Sato T., Nakayama K., Souma S., Wada T., Okamoto Y., Takenaka K., Yamakawa Y., Yamakage A., Mitsuhashi T.

Meeting Abstracts of the Physical Society of Japan　73　(0)　1507-1507　2018
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.73.1.0_1507 　
Observation of Dirac-like energy band and ring-torus Fermi surface associated with the nodal line in topological insulator CaAgAs Peer-reviewed

Daichi Takane, Kosuke Nakayama, Seigo Souma, Taichi Wada, Yoshihiko Okamoto, Koshi Takenaka, Youichi Yamakawa, Ai Yamakage, Taichi Mitsuhashi, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Takafumi Sato

NPJ QUANTUM MATERIALS　3　2018/01

DOI： 10.1038/s41535-017-0074-z 　

ISSN： 2397-4648

eISSN： 2397-4648
Emergence of undulating surface band upon oxygen adsorption of Fe thin flim on W(110) Peer-reviewed

Seigo Souma, Kohei Honma, Takafumi Sato, Masahito Tsujikawa, Masafumi Shirai, Takashi Takahashi

APPLIED PHYSICS LETTERS　111　(24)　2017/12

DOI： 10.1063/1.5017484 　

ISSN： 0003-6951

eISSN： 1077-3118
Enhancement of band gap and evolution of in-gap states in hydrogen-adsorbed monolayer graphene on SiC(0001) Peer-reviewed

K. Sugawara, K. Suzuki, M. Sato, T. Sato, T. Takahashi

CARBON　124　584-587　2017/11

DOI： 10.1016/j.carbon.2017.09.024 　

ISSN： 0008-6223

eISSN： 1873-3891
Two-dimensional Dirac semimetal phase in non-doped one-monolayer FeSe film Peer-reviewed

S. Kanayama, K. Nakayama, G. N. Phan, M. Kuno, K. Sugawara, T. Takahashi, T. Sato

Phys. Rev. B　96　220509R-1-220509R-5　2017/10
Unconventional electronic structure of silicene on Ag/H-Si(111) Peer-reviewed

K. Sugawara, E. Noguchi, T. Sato, T. Takahashi

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　219　41-44　2017/08

DOI： 10.1016/j.elspec.2016.10.005 　

ISSN： 0368-2048

eISSN： 1873-2526
ARPES study of cesium-coated FeSe thin films on SrTiO3 Peer-reviewed

G. N. Phan, K. Nakayama, S. Kanayama, M. Kuno, K. Sugawara, T. Sato, T. Takahashi

Journal of Physics: Conference Series　871　(1)　012017　2017/07/26
Publisher: Institute of Physics Publishing
DOI： 10.1088/1742-6596/871/1/012017 　

ISSN： 1742-6596 1742-6588
Three-dimensional band structure of LaSb and CeSb: Absence of band inversion Peer-reviewed

H. Oinuma, S. Souma, D. Takane, T. Nakamura, K. Nakayama, T. Mitsuhashi, K. Horiba, H. Kumigashira, M. Yoshida, A. Ochiai, T. Takahashi, T. Sato

Physical Review B　96　(4)　2017/07/18

DOI： 10.1103/PhysRevB.96.041120 　

ISSN： 2469-9969 2469-9950
Effects of strain on the electronic structure, superconductivity, and nematicity in FeSe studied by angle-resolved photoemission spectroscopy Peer-reviewed

G. N. Phan, K. Nakayama, K. Sugawara, T. Sato, T. Urata, Y. Tanabe, K. Tanigaki, F. Nabeshima, Y. Imai, A. Maeda, T. Takahashi

PHYSICAL REVIEW B　95　(22)　224507-1-224507-6　2017/06

DOI： 10.1103/PhysRevB.95.224507 　

ISSN： 2469-9950

eISSN： 2469-9969
High- Temperature Superconductivity and Lattice Relaxation in Lithium- Deposited FeSe on SrTiO3 Peer-reviewed

Giao N. Phan, Kosuke Nakayama, Shota Kanayama, Masato Kuno, Katsuaki Sugawara, Takafumi Sato, Takashi Takahashi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　86　(3)　033706　2017/03

DOI： 10.7566/JPSJ.86.033706 　

ISSN： 0031-9015
Band splitting and Weyl nodes in trigonal tellurium studied by angle-resolved photoemission spectroscopy and density functional theory Peer-reviewed

K. Nakayama, M. Kuno, K. Yamauchi, S. Souma, K. Sugawara, T. Oguchi, T. Sato, T. Takahashi

PHYSICAL REVIEW B　95　(12)　125204　2017/03

DOI： 10.1103/PhysRevB.95.125204 　

ISSN： 2469-9950

eISSN： 2469-9969
Electronic states of topological line-node semimetal CaAgAs studied by Soft X-ray ARPES

Takane D., Horiba K., Kumigashira H., Sato T., Takahashi T., Nakayama K., Souma S., Wada T., Okamoto Y., Takenaka K., Yamakawa Y., Yamakage A., Mitsuhashi T.

Meeting Abstracts of the Physical Society of Japan　72　(0)　944-944　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.2.0_944 　
Monolayer 1 T-NbSe2 as a Mott insulator Peer-reviewed

Yuki Nakata, Katsuaki Sugawara, Ryota Shimizu, Yoshinori Okada, Patrick Han, Taro Hitosugi, Keiji Ueno, Takafumi Sato, Takashi Takahashi

NPG ASIA MATERIALS　8　e321　2016/11

DOI： 10.1038/am.2016.157 　

ISSN： 1884-4049

eISSN： 1884-4057
Dirac-node arc in the topological line-node semimetal HfSiS Peer-reviewed

D. Takane, Zhiwei Wang, S. Souma, K. Nakayama, C. X. Trang, T. Sato, T. Takahashi, Yoichi Ando

PHYSICAL REVIEW B　94　(12)　121108(R)　2016/09

DOI： 10.1103/PhysRevB.94.121108 　

ISSN： 2469-9950

eISSN： 2469-9969
Work function of bulk-insulating topological insulator Bi2-xSbxTe3-ySey Peer-reviewed

Daichi Takane, Seigo Souma, Takafumi Sato, Takashi Takahashi, Kouji Segawa, Yoichi Ando

APPLIED PHYSICS LETTERS　109　(9)　091601　2016/08

DOI： 10.1063/1.4961987 　

ISSN： 0003-6951

eISSN： 1077-3118
Fermi level position, Coulomb gap, and Dresselhaus splitting in (Ga,Mn)As Peer-reviewed

S. Souma, L. Chen, R. Oszwaldowski, T. Sato, F. Matsukura, T. Dietl, H. Ohno, T. Takahashi

SCIENTIFIC REPORTS　6　27266-1-27266-10　2016/06

DOI： 10.1038/srep27266 　

ISSN： 2045-2322
Fermiology of possible topological superconductor Tl0.5Bi2Te3 derived from hole-doped topological insulator Peer-reviewed

C. X. Trang, Z. Wang, D. Takane, K. Nakayama, S. Souma, T. Sato, T. Takahashi, A. A. Taskin, Yoichi Ando

PHYSICAL REVIEW B　93　(24)　241103(R)-1-241103(R)-5　2016/06

DOI： 10.1103/PhysRevB.93.241103 　

ISSN： 2469-9950

eISSN： 2469-9969
Enhancement of electron-phonon coupling in Cs-overlayered intercalated bilayer graphene Peer-reviewed

J. Kleeman, K. Sugawara, T. Sato, T. Takahashi

JOURNAL OF PHYSICS-CONDENSED MATTER　28　(20)　204001-1-204001-6　2016/05

DOI： 10.1088/0953-8984/28/20/204001 　

ISSN： 0953-8984

eISSN： 1361-648X
Tunable two-dimensional electron gas at the surface of thermoelectric material In4Se3 Peer-reviewed

K. Fukutani, T. Sato, P. V. Galiy, K. Sugawara, T. Takahashi

PHYSICAL REVIEW B　93　(20)　205156-1-205156-6　2016/05

DOI： 10.1103/PhysRevB.93.205156 　

ISSN： 2469-9950

eISSN： 2469-9969
Bulk superconducting gap of V3Si studied by low-energy ultrahigh-resolution photoemission spectroscopy Peer-reviewed

T. Sato, S. Souma, K. Nakayama, K. Sugawara, N. Toyota, T. Takahashi

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　208　40-42　2016/04

DOI： 10.1016/j.elspec.2015.04.009 　

ISSN： 0368-2048

eISSN： 1873-2526
Metal-insulator transition and tunable Dirac-cone surface state in the topological insulator TlBi1-xSbxTe2 studied by angle-resolved photoemission Peer-reviewed

Chi Xuan Trang, Zhiwei Wang, Keiko Yamada, Seigo Souma, Takafumi Sato, Takashi Takahashi, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW B　93　(16)　165123-1-165123-5　2016/04

DOI： 10.1103/PhysRevB.93.165123 　

ISSN： 2469-9950

eISSN： 2469-9969
Direct observation of nonequivalent Fermi-arc states of opposite surfaces in the noncentrosymmetric Weyl semimetal NbP Peer-reviewed

S. Souma, Zhiwei Wang, H. Kotaka, T. Sato, K. Nakayama, Y. Tanaka, H. Kimizuka, T. Takahashi, K. Yamauchi, T. Oguchi, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW B　93　(16)　161112R-1-161112R-6　2016/04

DOI： 10.1103/PhysRevB.93.161112 　

ISSN： 2469-9950

eISSN： 2469-9969
19aBQ-2 High-resolution ARPES study of superconductivity and nematicity in FeSe

Phan Giao, Kanayama S., Nakayama K., Sugawara K., Sato T., Urata T., Tanabe Y., Tanigaki K., Nabeshima F., Imai Y., Maeda A., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1991-1991　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1991 　

ISSN： 2189-079X
19aBQ-3 Electron-doping effects on FeSe studied by high-resolution ARPES

Kanayama S., Kuno M., Phan Giao, Nakayama K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1992-1992　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1992 　

ISSN： 2189-079X
19aAJ-6 Edge state of Sb thin film studied by spin-resolved ARPES

Takayama A., Sato T., Souma S., Oguchi T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　2472-2472　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_2472 　

ISSN： 2189-079X
19aAJ-4 Electronic structure of Bi ultrathin film on transition-metal dichalcogenide 1T-TaS_2 studied by high-resolution ARPES

Yamada K., Trang C., Souma S., Sugawara K., Sato T., Ueno K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　2470-2470　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_2470 　

ISSN： 2189-079X
19pBA-13 Surface Fermi-arc of Weyl-semimetal candidate NbP studied by high-resolution ARPES

Souma S., Wang Z., Kotaka H., Sato T., Nakayama K., Tanaka Y., Kimizuka H., Takahashi T., Yamauchi K., Oguchi T., Segawa K., Ando Y.

Meeting Abstracts of the Physical Society of Japan　71　1328-1328　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1328 　

ISSN： 2189-079X
20pBE-2 Thickness dependence of electronic states in NbSe_2 thin film studied by high-resolution ARPES

Nakata Y., Yamada K., Kimizuka H., Tanaka Y., Sugawara K., Souma S., Sato T., Shimizu R., Hitosugi T., Ueno K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1868-1868　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1868 　

ISSN： 2189-079X
22aAS-3 High-resolution ARPES study of trilayer graphene on H-SiC

Yamamura N., Suzuki K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1926-1926　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1926 　

ISSN： 2189-079X
20pBE-1 High-resolution ARPES study of TiSe_2 thin film

Sugawara K., Nakata Y., Shimizu R., Han P., Hitosugi T., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1867-1867　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1867 　

ISSN： 2189-079X
19aBP-6 High-resolution ARPES study on noncentrosymmetric Weyl-semimetallic transition-metal monopnictides

Takane D., Souma S., Wang Z., Kotaka H., Sato T., Nakayama K., Tanaka Y., Kimizuka H., Takahashi T., Yamauchi K., Oguchi T., Segawa K., Ando Y.

Meeting Abstracts of the Physical Society of Japan　71　1446-1446　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1446 　

ISSN： 2189-079X
19aBP-4 K-deposition effects on iron-based superconductors studied by high-resolution ARPES

Kuno M., Kanayama S., Phan Giao, Nakayama K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1444-1444　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1444 　

ISSN： 2189-079X
19aBP-3 High-resolution ARPES study of K-adsorbed monolayer graphene/SiC

Sato M., Yamamura N., Suzuki K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1443-1443　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1443 　

ISSN： 2189-079X
19aBP-5 Hybridization effects on the Dirac-cone electronic states of Bi_2Se_3 ultrathin films studied by high-resolution ARPES

Shimamura N., Kimizuka H., Tanaka Y., Souma S., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1445-1445　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1445 　

ISSN： 2189-079X
22aBA-5 High-resolution ARPES study of Tl(Bi,Sb)Te_2

Trang C., Yamada K., Tanaka Y., Souma S., Sato T., Wang Z., Segawa K., Ando Y., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1414-1414　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1414 　

ISSN： 2189-079X
In-situ high-resolution ARPES study of (Ga,Mn)As

Souma S, Chen L, Oszwałdowski R, Sato T, Matsukura F, Ditel T, Ohno H, Takahashi T

Meeting Abstracts of the Physical Society of Japan　71　848-848　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_848 　
Search for two-dimensional topological insulators in atomic-layer Bi thin films by high-resolution ARPES

Shimamura N., Nakata Y., Kimizuka H., Tanaka Y., Souma S., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1185-1185　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1185 　
Temperature dependence of band structure in TiSe₂ ultrathin film

Sugawara K., Nakata Y., Shimizu R., Han P., Hitosugi T., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1172-1172　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1172 　
Electronic structure of atomic layer NbSe₂ thin film studied by high-resolution ARPES

Nakata Y., Sugawara K., Souma S., Sato T., Shimuzu R., Hitosugi T., Ueno K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1171-1171　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1171 　
High-resolution ARPES study of doped iron selenide

Giao Phan

Meeting Abstracts of the Physical Society of Japan　71　2030-2030　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_2030 　
High-resolution ARPES study of S-substituted FeSe

Nakayama K., Kuno M., Kanayama S., Phan G., Sato T., Tanabe Y., Urata T., Tanigaki K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　2031-2031　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_2031 　
Termination dependence of surface electronic states in Weyl semimetal NbP.

Takane D., Souma S., Wang Z., Kotaka H., Sato T., Nakayama K., Tanaka Y., Kimizuka H., Takahashi T., Yamauchi K., Oguchi T., Segawa K., Ando Y.

Meeting Abstracts of the Physical Society of Japan　71　2314-2314　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_2314 　
K-doped trilayer graphene: high-resolution ARPES

Yamamura N., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1690-1690　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1690 　
High-resolution ARPES study of non-doped single-layer FeSe

Kanayama S., Kuno M., Phan G., Nakayama K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　2029-2029　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_2029 　
High-resolution ARPES study of bulk-insulating topological insulator TlBi_1-xSb_xTe₂

Trang C., Yamada K., Tanaka Y., Souma S., Sato T., Wang Z., Segawa K., Ando Y., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1332-1332　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1332 　

More details Close

<p>We have performed a systematic ARPES experiment on a solid-solution topological insulator (TI) system TlBi_1-x_Sb_x_Te_2_ which is bulk insulating at 0.5 < x < 0.9. We found that the surface Dirac point gradually becomes isolated from the bulk valence band, resulting in a sign change of Dirac carriers from n- to p-type. Moreover, we found that this TI system has the largest Dirac velocity among known solid-solution TI. In this presentation, we will discuss in detail the evolution of electronic states as a function of x.</p>
Bi-deposition effects on FeSe thin film studied by high-resolution ARPES

Kuno M., Kanayama S., Phan G., Nakayama K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1331-1331　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1331 　
High-resolution ARPES study of Li-adsorbed monolayer graphene

Sato M., Yamamura N., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1330-1330　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1330 　
High-resolution ARPES study of NbSe₂ thin film grown on Graphene

Nakata Y., Sugawara K., Souma S., Sato T., Shimuzu R., Hitosugi T., Ueno K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　1393-1393　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1393 　
Anomalous band structure of Bi ultrathin film on 1T-TaS₂ studied by high-resolution ARPES

Yamada K., Trang C., Souma S., Sugawara K., Sato T., Ueno K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　71　2310-2310　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_2310 　
Unconventional Charge-Density-Wave Transition in Monolayer 1T-TiSe2 Peer-reviewed

Katsuaki Sugawara, Yuki Nakata, Ryota Shimizu, Patrick Han, Taro Hitosugi, Takafumi Sato, Takashi Takahashi

ACS NANO　10　(1)　1341-1345　2016/01

DOI： 10.1021/acsnano.5b06727 　

ISSN： 1936-0851

eISSN： 1936-086X
Switching of Dirac-Fermion Mass at the Interface of Ultrathin Ferromagnet and Rashba Metal Peer-reviewed

K. Honma, T. Sato, S. Souma, K. Sugawara, Y. Tanaka, T. Takahashi

PHYSICAL REVIEW LETTERS　115　(26)　266401-1-266401-5　2015/12

DOI： 10.1103/PhysRevLett.115.266401 　

ISSN： 0031-9007

eISSN： 1079-7114
Observation of two-dimensional bulk electronic states in the superconducting topological insulator heterostructure Cu-x(PbSe)(5)(Bi2Se3)(6): Implications for unconventional superconductivity Peer-reviewed

K. Nakayama, H. Kimizuka, Y. Tanaka, T. Sato, S. Souma, T. Takahashi, Satoshi Sasaki, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW B　92　(10)　100508R-1-100508R-5　2015/09

DOI： 10.1103/PhysRevB.92.100508 　

ISSN： 1098-0121

eISSN： 1550-235X
High-temperature superconductivity in potassium-coated multilayer FeSe thin films Peer-reviewed

Y. Miyata, K. Nakayama, K. Sugawara, T. Sato, T. Takahashi

NATURE MATERIALS　14　(8)　775-+　2015/08

DOI： 10.1038/NMAT4302 　

ISSN： 1476-1122

eISSN： 1476-4660
Spin- and valley-coupled electronic states in monolayer WSe2 on bilayer graphene Peer-reviewed

K. Sugawara, T. Sato, Y. Tanaka, S. Souma, T. Takahashi

APPLIED PHYSICS LETTERS　107　(7)　071601-1-071601-4　2015/08

DOI： 10.1063/1.4928658 　

ISSN： 0003-6951

eISSN： 1077-3118
High-resolution angle-resolved photoemission study of quasi-one-dimensional semiconductor In4Se3 Peer-reviewed

K. Fukutani, Y. Miyata, I. Matsuzaki, P. V. Galiy, P. A. Dowen, T. Sato, T. Takahashi

J. Phys. Soc. Jpn.　84　(7)　074710-1-074710-6　2015/06/30
Publisher: The Physical Society of Japan
DOI： 10.7566/JPSJ.84.074710 　

ISSN： 0031-9015
Rashba effect of bismuth thin film on silicon studied by spin-resolved ARPES Peer-reviewed

A. Takayama, T. Sato, S. Souma, T. Takahashi

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　201　105-109　2015/05

DOI： 10.1016/j.elspec.2014.11.002 　

ISSN： 0368-2048

eISSN： 1873-2526
Superstructure-dependent electronic states in CaAlSi superconductors studied by angle-resolved photoemission spectroscopy Peer-reviewed

T. Sato, Y. X. Xiao, S. Souma, K. Nakayama, K. Sugawara, S. Kuroiwa, J. Akimitsu, T. Takahashi

PHYSICAL REVIEW B　91　(19)　195114-1-195114-6　2015/05

DOI： 10.1103/PhysRevB.91.195114 　

ISSN： 1098-0121

eISSN： 1550-235X
Charge-Density Wave in Ca-Intercalated Bilayer Graphene Induced by Commensurate Lattice Matching Peer-reviewed

Ryota Shimizu, Katsuaki Sugawara, Kohei Kanetani, Katsuya Iwaya, Takafumi Sato, Takashi Takahashi, Taro Hitosugi

PHYSICAL REVIEW LETTERS　114　(14)　146103-1-146103-5　2015/04

DOI： 10.1103/PhysRevLett.114.146103 　

ISSN： 0031-9007

eISSN： 1079-7114
Topological proximity effect in a topological insulator hybrid Peer-reviewed

T. Shoman, A. Takayama, T. Sato, S. Souma, T. Takahashi, T. Oguchi, Kouji Segawa, Yoichi Ando

NATURE COMMUNICATIONS　6　6547-1-6547-6　2015/03

DOI： 10.1038/ncomms7547 　

ISSN： 2041-1723
One-Dimensional Edge States with Giant Spin Splitting in a Bismuth Thin Film Peer-reviewed

A. Takayama, T. Sato, S. Souma, T. Oguchi, T. Takahashi

PHYSICAL REVIEW LETTERS　114　(6)　066402-1-066402-5　2015/02

DOI： 10.1103/PhysRevLett.114.066402 　

ISSN： 0031-9007

eISSN： 1079-7114
16pCB-7 Mass control of Dirac electrons at the interface of Fe/W(110)

Sato T., Honma K., Souma S., Tanaka Y., Sugawara K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　2255-2255　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_2255 　

ISSN： 2189-079X
16pCB-10 High-resolution angle-resolved photoemission study of quasi-one-dimensional electronic states on W(112)

Fukutani K., Honma K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　2258-2258　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_2258 　

ISSN： 2189-079X
17pAH-4 High-resolution ARPES study of NbSe_2 thin film

Nakata Y., Yamada K., Kimizuka H., Tanaka Y., Sugawara K., Souma S., Sato T., Ueno K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1592-1592　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1592 　

ISSN： 2189-079X
17pAH-3 High-resolution ARPES study of WSe_2 thin film

Sugawara K., Sato T., Tanaka Y., Souma S., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1591-1591　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1591 　

ISSN： 2189-079X
19pCA-4 Film-thickness dependence of electronic states in Bi_2Se_3 thin film studied by high-resolution ARPES

Kimizuka H., Tanaka Y., Souma S., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　2379-2379　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_2379 　

ISSN： 2189-079X
18aCE-4 High-resolution ARPES study of TlBi(S,Se,Te)_2

Trang C., Yamada K., Tanaka Y., Souma S., Sato T., Wang Z., Segawa K., Ando Y., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1231-1231　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1231 　

ISSN： 2189-079X
18aCE-3 Bi ultrathin film on 1T-TaS_2 studied by high-resolution ARPES

Yamada K., C. Trang, Souma S., Sugawara K., Sato T., Ueno K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1230-1230　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1230 　

ISSN： 2189-079X
18aCE-2 High-resolution ARPES study of trilayer graphene on H-SiC

Yamamura N., Suzuki K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1229-1229　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1229 　

ISSN： 2189-079X
18aAE-10 Hydrogen-adsorption effect of monolayer graphene on SiC studied by high-resolution ARPES

Suzuki K., Yamamura N., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1079-1079　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1079 　

ISSN： 2189-079X
16pAG-11 High-resolution ARPES study of a topological superconductor candidate Cu_x(PbSe)_5(Bi_2Se_3)_6

Nakayama K., Kimizuka H., Tanaka Y., Sato T., Souma S., Takahashi T., Sasaki S., Segawa K., Ando Y.

Meeting Abstracts of the Physical Society of Japan　70　1029-1029　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1029 　

ISSN： 2189-079X
16aDB-8 Fine electronic structure of FeSe studied by high-resolution ARPES

Phan Giao, Kanayama Shota, Nakayama Kosuke, Sato Takafumi, Tanabe Yoichi, Urata Takahiro, Tanigaki Katsumi, Takahashi Takashi

Meeting Abstracts of the Physical Society of Japan　70　1683-1683　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1683 　

ISSN： 2189-079X
16aDB-11 High-temperature superconductivity in K-coated multilayer FeSe thin films seen via high-resolution ARPES

Nakayama K., Miyata Y., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1686-1686　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1686 　

ISSN： 2189-079X
18aCE-5 Electronic structure of FeSe ultrathin films studied by high-resolution ARPES

Kanayama S., Phan G., Miyata Y., Nakayama K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1232-1232　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1232 　

ISSN： 2189-079X
18aAG-10 ARPES study of Bi-based topological-insulator thin films using newly-developed spin-resolved ARPES system

Tanaka Y., Kimizuka H., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1093-1093　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1093 　

ISSN： 2189-079X
19aCG-2 Oxygen adsorption effect on surface electronic band structure in Fe(110) thin film : High-resolution ARPES

Souma S., Honma K., Sugawara K., Sato T., Tsujikawa M., Shirai M., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　967-967　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_967 　

ISSN： 2189-079X
23pAS-4 Development of spin-resolved photoemission spectrometer and electronic structure of topological-insulator thin film

Souma S., Tanaka Y., Sugawara K., Kimizuka H., Honma H., Shoman T., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　2629-2629　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_2629 　

ISSN： 2189-079X
24aAL-1 Hydrogen-absorption-dependence of electronic states in single-layer graphene

Suzuki K., Noguchi E., Kleeman James, Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1902-1902　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1902 　

ISSN： 2189-079X
21pBA-16 High-resolution ARPES study of FeSe ultrathin films

Nakayama K., Miyata Y., Phan Giao, Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　2001-2001　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_2001 　

ISSN： 2189-079X
22pAC-7 Electron-phonon coupling of Cs-intercalated bilayer graphene

Kleeman J., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1850-1850　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1850 　

ISSN： 2189-079X
21pBA-14 High-resolution ARPES study of Fe_<1-x>Co_xSe

Phan Giao, Miyata Yasunari, Nakayama Kosuke, Sato Takafumi, Tanabe Yoichi, Urata Takahiro, Tanigaki Katsumi, Takahashi Takashi

Meeting Abstracts of the Physical Society of Japan　70　1999-1999　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1999 　

ISSN： 2189-079X
23pAB-4 High-resolution ARPES study of transition metal dichalcogenide thin film

Sugawara K., Tanaka Y., Suzuki K., Kimizuka H., Souma S., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1348-1348　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1348 　

ISSN： 2189-079X
21aCN-3 Topological proximity effect at the interface of Rashba metal and topological insulator studied by high-resolution ARPES

Shoman T., Sato T., Takayama A., Souma S., Takahashi T., Oguchi T., Segawa K., Ando Y.

Meeting Abstracts of the Physical Society of Japan　70　1419-1419　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1419 　

ISSN： 2189-079X
21aCN-1 Development of ultrahigh-resolution spin-resolved photoemission spectrometer

Tanaka Y., Souma S., Sugawara K., Kimizuka H., Honma K., Shoman T., Sato T., Baltzer Peter, Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1417-1417　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1417 　

ISSN： 2189-079X
21aCN-2 Fabrication and ARPES study of ultrathin films of topological insulator Bi_2Se_3

Kimizuka H., Sugawara K., Tanaka Y., Souma S., Shouman T., Honma K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1418-1418　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1418 　

ISSN： 2189-079X
21pAB-4 Magnetic proximity effect to Dirac-cone states at the interface of Fe/W(110) : High-resolution ARPES

Honma K., Souma S., Sato T., Tanaka Y., Sugawara K., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　2519-2519　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_2519 　

ISSN： 2189-079X
21aCN-4 High-resolution angle-resolved photoemission study of W(112)

Fukutani K., Honma K., Sugawara K., Sato T., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　1420-1420　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.1.0_1420 　

ISSN： 2189-079X
Anisotropic Electron-Phonon Coupling in Rb-Intercalated Bilayer Graphene Peer-reviewed

James Kleeman, Katsuaki Sugawara, Takafumi Sato, Takashi Takahashi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　83　(12)　124715-1-124715-5　2014/12

DOI： 10.7566/JPSJ.83.124715 　

ISSN： 0031-9015
Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor Peer-reviewed

K. Nakayama, Y. Miyata, G. N. Phan, T. Sato, Y. Tanabe, T. Urata, K. Tanigaki, T. Takahashi

PHYSICAL REVIEW LETTERS　113　(23)　237001-1-237001-5　2014/12

DOI： 10.1103/PhysRevLett.113.237001 　

ISSN： 0031-9007

eISSN： 1079-7114
Band-gap tuning of monolayer graphene by oxygen adsorption Peer-reviewed

Toru Takahashi, Katsuaki Sugawara, Eiichi Noguchi, Takafumi Sato, Takashi Takahashi

CARBON　73　141-145　2014/07

DOI： 10.1016/j.carbon.2014.02.049 　

ISSN： 0008-6223

eISSN： 1873-3891
Rashba effect in antimony and bismuth studied by spin-resolved ARPES Peer-reviewed

A. Takayama, T. Sato, S. Souma, T. Takahashi

NEW JOURNAL OF PHYSICS　16　155004　2014/05

DOI： 10.1088/1367-2630/16/5/055004 　

ISSN： 1367-2630
Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-xSex Peer-reviewed

E. Ieki, K. Nakayama, Y. Miyata, T. Sato, H. Miao, N. Xu, X. -P. Wang, P. Zhang, T. Qian, P. Richard, Z. -J. Xu, J. S. Wen, G. D. Gu, H. Q. Luo, H. -H. Wen, H. Ding, T. Takahashi

PHYSICAL REVIEW B　89　(14)　140506R　2014/04

DOI： 10.1103/PhysRevB.89.140506 　

ISSN： 1098-0121

eISSN： 1550-235X
Electronic band structure and Fermi surfaces of the quasi-two-dimensional monophosphate tungsten bronze, P4W12O44 Peer-reviewed

S. Paul, A. Ghosh, T. Sato, D. D. Sarma, T. Takahashi, E. Wang, M. Greenblatt, S. Raj

EPL　105　(4)　47003　2014/02

DOI： 10.1209/0295-5075/105/47003 　

ISSN： 0295-5075

eISSN： 1286-4854
Bi薄膜におけるエッジ構造のスピン分解ARPES

高山あかり, 佐藤宇史, 相馬清吾, 小口多美夫, 高橋隆

表面科学学術講演会要旨集　34　109-109　2014
Publisher: 公益社団法人日本表面科学会
DOI： 10.14886/sssj2008.34.0_109 　

More details Close

今回我々は、Si(111)上にアイランド成長したBi薄膜のエッジ構造について、東北大学で建設・改良した高分解能光電子分光装置を用いてスピン分解ARPES測定を行った。その結果、理論計算で予測された1次元ラシュバ効果のスピン構造と定性的に一致するスピン偏極率を観測した。講演では、詳細な実験結果を報告し、2次元ラシュバ効果および理論計算との比較から、1次元エッジ構造におけるラシュバ効果について議論を行う。
Relationship between Fermi surface warping and out-of-plane spin polarization in topological insulators: A view from spin- and angle-resolved photoemission Peer-reviewed

M. Nomura, S. Souma, A. Takayama, T. Sato, T. Takahashi, K. Eto, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW B　89　(4)　045134　2014/01

DOI： 10.1103/PhysRevB.89.045134 　

ISSN： 2469-9950

eISSN： 2469-9969
Two types of Dirac-cone surface states on the (111) surface of the topological crystalline insulator SnTe Peer-reviewed

Y. Tanaka, T. Shoman, K. Nakayama, S. Souma, T. Sato, T. Takahashi, M. Novak, Kouji Segawa, Yoichi Ando

Physical Review B - Condensed Matter and Materials Physics　88　(23)　235126　2013/12/26

DOI： 10.1103/PhysRevB.88.235126 　

ISSN： 1098-0121 1550-235X
Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2 Peer-reviewed

N. Xu, P. Richard, X. Shi, A. van Roekeghem, T. Qian, E. Razzoli, E. Rienks, G. -F. Chen, E. Ieki, K. Nakayama, T. Sato, T. Takahashi, M. Shi, H. Ding

PHYSICAL REVIEW B　88　(22)　220508R　2013/12

DOI： 10.1103/PhysRevB.88.220508 　

ISSN： 1098-0121

eISSN： 1550-235X
Electronic structure of the iron chalcogenide KFeAgTe2 revealed by angle-resolved photoemission spectroscopy Peer-reviewed

R. Ang, K. Nakayama, W. G. Yin, T. Sato, Hechang Lei, C. Petrovic, T. Takahashi

Physical Review B - Condensed Matter and Materials Physics　88　(15)　155102　2013/10/02

DOI： 10.1103/PhysRevB.88.155102 　

ISSN： 1098-0121 1550-235X
Superconductivity and bandwidth-controlled Mott metal-insulator transition in 1T-TaS2-xSex Peer-reviewed

R. Ang, Y. Miyata, E. Ieki, K. Nakayama, T. Sato, Y. Liu, W. J. Lu, Y. P. Sun, T. Takahashi

Physical Review B - Condensed Matter and Materials Physics　88　(11)　115145　2013/09/30

DOI： 10.1103/PhysRevB.88.115145 　

ISSN： 1098-0121 1550-235X
Fermiology of the strongly spin-orbit coupled superconductor Sn 1-xInxTe: Implications for topological superconductivity Peer-reviewed

T. Sato, Y. Tanaka, K. Nakayama, S. Souma, T. Takahashi, S. Sasaki, Z. Ren, A. A. Taskin, Kouji Segawa, Yoichi Ando

Physical Review Letters　110　(20)　206804　2013/05/17

DOI： 10.1103/PhysRevLett.110.206804 　

ISSN： 0031-9007 1079-7114
Direct evidence for a metallic interlayer band in Rb-intercalated bilayer graphene Peer-reviewed

J. Kleeman, K. Sugawara, T. Sato, T. Takahashi

PHYSICAL REVIEW B　87　(19)　195401　2013/05

DOI： 10.1103/PhysRevB.87.195401 　

ISSN： 1098-0121
Tunability of the k-space location of the Dirac cones in the topological crystalline insulator Pb1-xSnxTe Peer-reviewed

Y. Tanaka, T. Sato, K. Nakayama, S. Souma, T. Takahashi, Zhi Ren, M. Novak, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW B　87　(15)　155105　2013/04

DOI： 10.1103/PhysRevB.87.155105 　

ISSN： 1098-0121
Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe0.75Ru0.25)(2)As-2 Peer-reviewed

N. Xu, P. Richard, X-P Wang, X. Shi, A. van Roekeghem, T. Qian, E. Ieki, K. Nakayama, T. Sato, E. Rienks, S. Thirupathaiah, J. Xing, H-H Wen, M. Shi, T. Takahashi, H. Ding

PHYSICAL REVIEW B　87　(9)　194513　2013/03

DOI： 10.1103/PhysRevB.87.094513 　

ISSN： 1098-0121
Observation of momentum space semi-localization in Si-doped beta-Ga2O3 Peer-reviewed

P. Richard, T. Sato, S. Souma, K. Nakayama, H. W. Liu, K. Iwaya, T. Hitosugi, H. Aida, H. Ding, T. Takahashi

APPLIED PHYSICS LETTERS　101　(23)　232105　2012/12

DOI： 10.1063/1.4769109 　

ISSN： 0003-6951
Manipulation of Topological States and the Bulk Band Gap Using Natural Heterostructures of a Topological Insulator Peer-reviewed

K. Nakayama, K. Eto, Y. Tanaka, T. Sato, S. Souma, T. Takahashi, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW LETTERS　109　(23)　236804　2012/12

DOI： 10.1103/PhysRevLett.109.236804 　

ISSN： 0031-9007
Experimental realization of a topological crystalline insulator in SnTe Peer-reviewed

Y. Tanaka, Zhi Ren, T. Sato, K. Nakayama, S. Souma, T. Takahashi, Kouji Segawa, Yoichi Ando

NATURE PHYSICS　8　(11)　800-803　2012/11

DOI： 10.1038/NPHYS2442 　

ISSN： 1745-2473
Ca intercalated bilayer graphene as a thinnest limit of superconducting C6Ca Peer-reviewed

Kohei Kanetani, Katsuaki Sugawara, Takafumi Sato, Ryota Shimizu, Katsuya Iwaya, Taro Hitosugi, Takashi Takahashi

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　109　(48)　19610-19613　2012/11

DOI： 10.1073/pnas.1208889109 　

ISSN： 0027-8424
Spin Polarization of Gapped Dirac Surface States Near the Topological Phase Transition in TlBi(S1-xSex)(2) Peer-reviewed

S. Souma, M. Komatsu, M. Nomura, T. Sato, A. Takayama, T. Takahashi, K. Eto, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW LETTERS　109　(18)　186804　2012/11

DOI： 10.1103/PhysRevLett.109.186804 　

ISSN： 0031-9007

eISSN： 1079-7114
Angle-resolved photoemission spectroscopy of iron pnictides Peer-reviewed

Takafumi Sato, Pierre Richard, Kosuke Nakayama, Takashi Takahashi, Hong Dingc

Iron-based Superconductors: Materials, Properties and Mechanisms　89-124　2012/10/31
Publisher: Pan Stanford Publishing Pte. Ltd.
DOI： 10.4032/9789814303231 　
Real-Space Coexistence of the Melted Mott State and Superconductivity in Fe-Substituted 1T-TaS2 Peer-reviewed

R. Ang, Y. Tanaka, E. Ieki, K. Nakayama, T. Sato, L. J. Li, W. J. Lu, Y. P. Sun, T. Takahashi

PHYSICAL REVIEW LETTERS　109　(17)　176403　2012/10

DOI： 10.1103/PhysRevLett.109.176403 　

ISSN： 0031-9007
Many-body interactions in Cu_xBi_2Se_3 studied by high-resoulution ARPES

Tanaka,Y, Nakayama,K, Souma,S, Sato,T, Xu,N, Zhang,P, Richard,P, Ding,H, Suzuki,Y, Das,P, Kadowaki,K, Takahashi,T

Meeting abstracts of the Physical Society of Japan　67　(2)　649　2012/08
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo 1.73Fe 0.27B 2 Peer-reviewed

K. Nakayama, E. Ieki, Y. Tanaka, T. Sato, T. Takahashi, T. Kuroda, H. Mizoguchi, S. W. Kim, H. Hosono

Physical Review B - Condensed Matter and Materials Physics　86　(1)　014503　2012/07/05

DOI： 10.1103/PhysRevB.86.014503 　

ISSN： 1098-0121 1550-235X
Co-Based Boride Superconductor LaCo2B2: Similar to or Different from Fe-Based Pnitctide Superconductor? Peer-reviewed

K. Nakayama, E. Ieki, Y. Tanaka, T. Sato, T. Takahashi, T. Kuroda, H. Mizoguchi, S. W. Kim, H. Hosono

Phys. Rev. B　86　014503　2012/07/05
Anomalous Rashba effect of bismuth(111) thin films studied by high-resolution spin- and angle-resolved photoemission spectroscopy Peer-reviewed

Akari Takayama, Takafumi Sato, Seigo Souma, Takashi Takahashi

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B　30　(4)　04E107　2012/07

DOI： 10.1116/1.4731467 　

ISSN： 1071-1023
Tunable Spin Polarization in Bismuth Ultrathin Film on Si(111) Peer-reviewed

Akari Takayama, Takafumi Sato, Seigo Souma, Tamio Oguchi, Takashi Takahashi

NANO LETTERS　12　(4)　1776-1779　2012/04

DOI： 10.1021/nl2035018 　

ISSN： 1530-6984
Topological Surface States in Lead-Based Ternary Telluride Pb(Bi1-xSbx)(2)Te-4 Peer-reviewed

S. Souma, K. Eto, M. Nomura, K. Nakayama, T. Sato, T. Takahashi, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW LETTERS　108　(11)　116801-1-4　2012/03

DOI： 10.1103/PhysRevLett.108.116801 　

ISSN： 0031-9007
Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45 Peer-reviewed

H. Miao, P. Richard, Y. Tanaka, K. Nakayama, T. Qian, K. Umezawa, T. Sato, Y. -M. Xu, Y. B. Shi, N. Xu, X. -P. Wang, P. Zhang, H. -B. Yang, Z. -J. Xu, J. S. Wen, G. -D. Gu, X. Dai, J. -P. Hu, T. Takahashi, H. Ding

PHYSICAL REVIEW B　85　(9)　094506-1-6　2012/03

DOI： 10.1103/PhysRevB.85.094506 　

ISSN： 1098-0121
Evolution of electronic structure upon Cu doping in the topological insulator Bi2Se3 Peer-reviewed

Y. Tanaka, K. Nakayama, S. Souma, T. Sato, N. Xu, P. Zhang, P. Richard, H. Ding, Y. Suzuki, P. Das, K. Kadowaki, T. Takahashi

PHYSICAL REVIEW B　85　(12)　125111-1-5　2012/03

DOI： 10.1103/PhysRevB.85.125111 　

ISSN： 1098-0121
Dirac-cone surface electronic states in topological insulators

SATO TAKAFUMI

Abstract of annual meeting of the Surface Science of Japan　32　5-5　2012
Publisher: The Surface Science Society of Japan
DOI： 10.14886/sssj2008.32.0_5 　
Anomalous Rashba effect of bismuth(111) thin films studied by high-resolution spin- and angle-resolved photoemission spectroscopy Peer-reviewed

Akari Takayama, Takafumi Sato, Seigo Souma, Takashi Takahashi

Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics　30　(4)　2012
Publisher: AVS Science and Technology Society
DOI： 10.1116/1.4731467 　

ISSN： 2166-2754 2166-2746
Tunable Dirac cone in the topological insulator Bi2-xSbxTe3-ySey Peer-reviewed

T. Arakane, T. Sato, S. Souma, K. Kosaka, K. Nakayama, M. Komatsu, T. Takahashi, Zhi Ren, Kouji Segawa, Yoichi Ando

NATURE COMMUNICATIONS　3　636-1-5　2012/01

DOI： 10.1038/ncomms1639 　

ISSN： 2041-1723
Unconventional Anisotropic s-Wave Superconducting Gaps of the LiFeAs Iron-Pnictide Superconductor Peer-reviewed

K. Umezawa, Y. Li, H. Miao, K. Nakayama, Z. -H. Liu, P. Richard, T. Sato, J. B. He, D. -M. Wang, G. F. Chen, H. Ding, T. Takahashi, S. -C. Wang

PHYSICAL REVIEW LETTERS　108　(3)　037002-1-4　2012/01

DOI： 10.1103/PhysRevLett.108.037002 　

ISSN： 0031-9007
Fe-based superconductors: An angle-resolved photoemission spectroscopy perspective Peer-reviewed

P. Richard, T. Sato, K. Nakayama, T. Takahashi, H. Ding

Reports on Progress in Physics　74　(12)　124512　2011/12

DOI： 10.1088/0034-4885/74/12/124512 　

ISSN： 0034-4885
Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator

T. Sato, Kouji Segawa, K. Kosaka, S. Souma, K. Nakayama, K. Eto, T. Minami, Yoichi Ando, T. Takahashi

Nature Physics　7　(11)　840-844　2011/11

DOI： 10.1038/nphys2058 　

ISSN： 1745-2473 1745-2481
Unconventional superconducting gap in NaFe0.95Co0.05As observed by angle-resolved photoemission spectroscopy Peer-reviewed

Z. -H. Liu, P. Richard, K. Nakayama, G. -F. Chen, S. Dong, J. -B. He, D. -M. Wang, T. -L. Xia, K. Umezawa, T. Kawahara, S. Souma, T. Sato, T. Takahashi, T. Qian, Yaobo Huang, Nan Xu, Yingbo Shi, H. Ding, S. -C. Wang

PHYSICAL REVIEW B　84　(6)　2011/08

DOI： 10.1103/PhysRevB.84.064519 　

ISSN： 1098-0121
22aTN-7 High-resolution ARPES study of Cu_xBi_2Se_3 superconductor

Tanaka,Y, Umezawa,K, Nakayama,K, Souma,S, Sato,T, Suzuki,Y, Das,Pradip, Kadowaki,K, Takahashi,T

Meeting abstracts of the Physical Society of Japan　66　(2)　761　2011/08
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Fermi surface dichotomy of the superconducting gap and pseudogap in underdoped pnictides Peer-reviewed

Y. -M. Xu, P. Richard, K. Nakayama, T. Kawahara, Y. Sekiba, T. Qian, M. Neupane, S. Souma, T. Sato, T. Takahashi, H. -Q. Luo, H. -H. Wen, G. -F. Chen, N. -L. Wang, Z. Wang, Z. Fang, X. Dai, H. Ding

NATURE COMMUNICATIONS　2　392-1-5　2011/07

DOI： 10.1038/ncomms1394 　

ISSN： 2041-1723
Fabrication of Li-intercalated bilayer graphene Peer-reviewed

K. Sugawara, K. Kanetani, T. Sato, T. Takahashi

AIP ADVANCES　1　(2)　022103-1-5　2011/06

DOI： 10.1063/1.3582814 　

ISSN： 2158-3226
Two pseudogaps with different energy scales at the antinode of the high-temperature Bi2Sr2CuO6 superconductor using angle-resolved photoemission spectroscopy Peer-reviewed

K. Nakayama, T. Sato, Y. -M. Xu, Z. -H. Pan, P. Richard, H. Ding, H. -H. Wen, K. Kudo, T. Sasaki, N. Kobayashi, T. Takahashi

PHYSICAL REVIEW B　83　(22)　224509-1-4　2011/06

DOI： 10.1103/PhysRevB.83.224509 　

ISSN： 1098-0121
Three-dimensional electronic structure in highly doped NaxCoO2 studied by angle-resolved photoemission spectroscopy Peer-reviewed

Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Takenori Fujii, Atsushi Asamitsu

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　72　(5)　552-555　2011/05

DOI： 10.1016/j.jpcs.2010.10.047 　

ISSN： 0022-3697
Direct Measurement of the Out-of-Plane Spin Texture in the Dirac-Cone Surface State of a Topological Insulator Peer-reviewed

S. Souma, K. Kosaka, T. Sato, M. Komatsu, A. Takayama, T. Takahashi, M. Kriener, Kouji Segawa, Yoichi Ando

PHYSICAL REVIEW LETTERS　106　(21)　216803-1-4　2011/05

DOI： 10.1103/PhysRevLett.106.216803 　

ISSN： 0031-9007

eISSN： 1079-7114
Evolution of surface states in Bi1-xSbx alloys across the topological phase transition Peer-reviewed

H. Guo, K. Sugawara, A. Takayama, S. Souma, T. Sato, N. Satoh, A. Ohnishi, M. Kitaura, M. Sasaki, Q. -K. Xue, T. Takahashi

PHYSICAL REVIEW B　83　(20)　201104R-1-4　2011/05

DOI： 10.1103/PhysRevB.83.201104 　

ISSN： 1098-0121
Photoemission study of electronic structure evolution across the metal-insulator transition of heavily B-doped diamond Peer-reviewed

H. Okazaki, T. Arakane, K. Sugawara, T. Sato, T. Takahashi, T. Wakita, M. Hirai, Y. Muraoka, Y. Takano, S. Ishii, S. Iriyama, H. Kawarada, T. Yokoya

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　72　(5)　582-584　2011/05

DOI： 10.1016/j.jpcs.2010.10.052 　

ISSN： 0022-3697
Giant Out-of-Plane Spin Component and the Asymmetry of Spin Polarization in Surface Rashba States of Bismuth Thin Film Peer-reviewed

A. Takayama, T. Sato, S. Souma, T. Takahashi

PHYSICAL REVIEW LETTERS　106　(16)　166401-1-4　2011/04

DOI： 10.1103/PhysRevLett.106.166401 　

ISSN： 0031-9007

eISSN： 1079-7114
Angle-resolved photoemission study of the doping evolution of a three-dimensional Fermi surface in NaxCoO2 Peer-reviewed

T. Arakane, T. Sato, T. Takahashi, T. Fujii, A. Asamitsu

NEW JOURNAL OF PHYSICS　13　043021-1-4　2011/04

DOI： 10.1088/1367-2630/13/4/043021 　

ISSN： 1367-2630
Electronic structure of optimally doped pnictide Ba0.6K0.4Fe2As2: a comprehensive angle-resolved photoemission spectroscopy investigation Peer-reviewed

H. Ding, K. Nakayama, P. Richard, S. Souma, T. Sato, T. Takahashi, M. Neupane, Y-M Xu, Z-H Pan, A. V. Fedorov, Z. Wang, X. Dai, Z. Fang, G. F. Chen, J. L. Luo, N. L. Wang

JOURNAL OF PHYSICS-CONDENSED MATTER　23　(13)　135701-1-6　2011/04

DOI： 10.1088/0953-8984/23/13/135701 　

ISSN： 0953-8984
Quasinested Fe orbitals versus Mott-insulating V orbitals in superconducting Sr2VFeAsO3 as seen from angle-resolved photoemission Peer-reviewed

T. Qian, N. Xu, Y. -B. Shi, K. Nakayama, P. Richard, T. Kawahara, T. Sato, T. Takahashi, M. Neupane, Y. -M. Xu, X. -P. Wang, G. Xu, X. Dai, Z. Fang, P. Cheng, H. -H. Wen, H. Ding

PHYSICAL REVIEW B　83　(14)　140513R-1-4　2011/04

DOI： 10.1103/PhysRevB.83.140513 　

ISSN： 1098-0121
Unconventional superconducting gap in NaFe0.95Co0.05As observed by ARPES Peer-reviewed

T. Qian, N. Xu, Y.-B. Shi, K. Nakayama, P. Richard, T. Kawahara, T. Sato, T. Takahashi, M. Neupane, Y.-M. Xu, X.-P. Wang, G. Xu, X. Dai, Z. Fang, P. Cheng, H.-H. Wen, H. Ding

Phys. Rev. B　84　064519-1-5　2011/04/01
Electron-hole asymmetry in the superconductivity of doped BaFe2As2 seen via the rigid chemical-potential shift in photoemission Peer-reviewed

M. Neupane, P. Richard, Y. -M. Xu, K. Nakayama, T. Sato, T. Takahashi, A. V. Federov, G. Xu, X. Dai, Z. Fang, Z. Wang, G. -F. Chen, N. -L. Wang, H. -H. Wen, H. Ding

PHYSICAL REVIEW B　83　(9)　094522-1-4　2011/03

DOI： 10.1103/PhysRevB.83.094522 　

ISSN： 1098-0121
Semiconductor-Metal Transition and Band-Gap Tuning in Quasi-Free-Standing Epitaxial Bilayer Graphene on SiC Peer-reviewed

Katsuaki Sugawara, Takafumi Sato, Kohei Kanetani, Takashi Takahashi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　80　(2)　024705-1-4　2011/02

DOI： 10.1143/JPSJ.80.024705 　

ISSN： 0031-9015
Angle-Resolved Photoemission Spectroscopy of Graphene, Graphite, and Related Compounds Peer-reviewed

T. Sato, T. Takahashi

Comprehensive Semiconductor Science and Technology　1-6　383-409　2011/01/01
Publisher: Elsevier Inc.
DOI： 10.1016/B978-0-44-453153-7.00086-9 　
Universality of superconducting gaps in overdoped Ba0.3K0.7Fe2As2 observed by angle-resolved photoemission spectroscopy Peer-reviewed

K. Nakayama, T. Sato, P. Richard, Y. -M. Xu, T. Kawahara, K. Umezawa, T. Qian, M. Neupane, G. F. Chen, H. Ding, T. Takahashi

PHYSICAL REVIEW B　83　(2)　020501-1-4　2011/01

DOI： 10.1103/PhysRevB.83.020501 　

ISSN： 1098-0121
Angle-resolved photoemission study of heavily electron-doped BaFe2-xCoxAs2 Peer-reviewed

Y. Sekiba, T. Sato, K. Nakayama, K. Terashima, P. Richard, J. H. Bowen, H. Ding, Y. -M. Xu, L. J. Li, G. H. Cao, Z. -A. Xu, T. Takahashi

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　470　S394-S396　2010/12

DOI： 10.1016/j.physc.2009.11.137 　

ISSN： 0921-4534
Xenon-plasma light ultrahigh-resolution ARPES study of low-energy single-particle excitation gap in (Bi,Pb)(2)Sr2CuO6 Peer-reviewed

K. Nakayama, T. Sato, Y. Sekiba, K. Terashima, P. Richard, K. Kudo, N. Okumura, T. Sasaki, N. Kobayashi, T. Takahashi

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　470　S129-S131　2010/12

DOI： 10.1016/j.physc.2010.01.001 　

ISSN： 0921-4534
Angle-Resolved Photoemission Spectroscopy of the Iron-Chalcogenide Superconductor Fe1.03Te0.7Se0.3: Strong Coupling Behavior and the Universality of Interband Scattering Peer-reviewed

K. Nakayama, T. Sato, P. Richard, T. Kawahara, Y. Sekiba, T. Qian, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding, T. Takahashi

PHYSICAL REVIEW LETTERS　105　(19)　197001-1-4　2010/11

DOI： 10.1103/PhysRevLett.105.197001 　

ISSN： 0031-9007
Van Hove Singularities as a Result of Quantum Confinement: The Origin of Intriguing Physical Properties in Pb Thin Films Peer-reviewed

Yu Jie Sun, S. Souma, Wen Juan Li, T. Sato, Xie Gang Zhu, Guang Wang, Xi Chen, Xu Cun Ma, Qi Kun Xue, Jin Feng Jia, T. Takahashi, T. Sakurai

NANO RESEARCH　3　(11)　800-806　2010/11

DOI： 10.1007/s12274-010-0047-z 　

ISSN： 1998-0124
Ultrahigh-resolution spin-resolved photoemission spectrometer with a mini Mott detector (vol 81, 095101, 2010) Peer-reviewed

S. Souma, A. Takayama, K. Sugawara, T. Sato, T. Takahashi

REVIEW OF SCIENTIFIC INSTRUMENTS　81　(10)　109901　2010/10

DOI： 10.1063/1.3503485 　

ISSN： 0034-6748
Direct Evidence for Cage Conduction Band in Superconducting Cement 12CaO center dot 7Al(2)O(3) by Low-Energy High-Resolution Photoemission Spectroscopy Peer-reviewed

Seigo Souma, Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Sung Wng Kim, Satoru Matsuishi, Hideo Hosono

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　79　(10)　103074-1-4　2010/10

DOI： 10.1143/JPSJ.79.103704 　

ISSN： 0031-9015
Ultrahigh-resolution spin-resolved photoemission spectrometer with a mini Mott detector Peer-reviewed

S. Souma, A. Takayama, K. Sugawara, T. Sato, T. Takahashi

REVIEW OF SCIENTIFIC INSTRUMENTS　81　(9)　095101-1-4　2010/09

DOI： 10.1063/1.3480542 　

ISSN： 0034-6748
Direct Evidence for the Dirac-Cone Topological Surface States in the Ternary Chalcogenide TlBiSe2 Peer-reviewed

Takafumi Sato, Kouji Segawa, Hua Guo, Katsuaki Sugawara, Seigo Souma, Takashi Takahashi, Yoichi Ando

PHYSICAL REVIEW LETTERS　105　(13)　136802-1-4　2010/09

DOI： 10.1103/PhysRevLett.105.136802 　

ISSN： 0031-9007
Observation of Dirac Cone Electronic Dispersion in BaFe2As2 Peer-reviewed

P. Richard, K. Nakayama, T. Sato, M. Neupane, Y. -M. Xu, J. H. Bowen, G. F. Chen, J. L. Luo, N. L. Wang, X. Dai, Z. Fang, H. Ding, T. Takahashi

PHYSICAL REVIEW LETTERS　104　(13)　137001-1-4　2010/04

DOI： 10.1103/PhysRevLett.104.137001 　

ISSN： 0031-9007
High-resolution ARPES study of electron-doped Fe-based superconductor BaFe1.85Co0.15As2 Peer-reviewed

T. Kawahara, K. Terashima, Y. Sekiba, J. H. Bowen, K. Nakayama, T. Sato, P. Richard, Y.-M. Xu, L. J. Li, G. H. Cao, Z.-A. Xu, H. Ding, T. Takahashi

Physica C　470　S440-S442　2010/04/01

DOI： 10.1103/PhysRevB.82.174509 　
Pseudogap of Charge-Density-Wave Compound SmNiC2 Studied by High-Resolution Photoemission Spectroscopy Peer-reviewed

Takafumi Sato, Seigo Souma, Kosuke Nakayama, Takashi Takahashi, Susumu Shimomura, Hideya Onodera

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　79　(4)　044707　2010/04

DOI： 10.1143/JPSJ.79.044707 　

ISSN： 0031-9015
Evidence for transition of Fermi-surface topology in highly doped NaxCoO2 Peer-reviewed

T. Arakane, T. Sato, T. Takahashi, T. Fujii, A. Asamitsu

PHYSICAL REVIEW B　81　(11)　115132-1-5　2010/03

DOI： 10.1103/PhysRevB.81.115132 　

ISSN： 1098-0121
Peculiar Rashba Splitting Originating from the Two-Dimensional Symmetry of the Surface Peer-reviewed

Kazuyuki Sakamoto, Haruya Kakuta, Katsuaki Sugawara, Koji Miyamoto, Akio Kimura, Takuya Kuzumaki, Nobuo Ueno, Emilia Annese, Jun Fujii, Ayaka Kodama, Tatsuya Shishidou, Hirofumi Namatame, Masaki Taniguchi, Takafumi Sato, Takashi Takahashi, Tamio Oguchi

PHYSICAL REVIEW LETTERS　103　(15)　156801　2009/10

DOI： 10.1103/PhysRevLett.103.156801 　

ISSN： 0031-9007

eISSN： 1079-7114
METAL-INSULATOR TRANSITION OF NaxWO3 STUDIED BY ANGLE-RESOLVED PHOTOEMISSION SPECTROSCOPY Peer-reviewed

Satyabrata Raj, Takafumi Sato, Seigo Souma, Takashi Takahashi, D. D. Sarma, Priya Mahadevan

MODERN PHYSICS LETTERS B　23　(24)　2819-2846　2009/09

DOI： 10.1142/S0217984909021004 　

ISSN： 0217-9849

eISSN： 1793-6640
Reconstruction of the Fermi surface and the anisotropic excitation gap of Na0.5CoO2 Peer-reviewed

Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Takenori Fujii, Atsushi Asamitsu

PHYSICAL REVIEW B　80　(8)　081101(R)　2009/08

DOI： 10.1103/PhysRevB.80.081101 　

ISSN： 1098-0121
Magnetic phase transition of CeSb studied by low-energy angle-resolved photoemission spectroscopy Peer-reviewed

Akari Takayama, Seigo Souma, Takafumi Sato, Toshiyuki Arakane, Takashi Takahashi

Journal of the Physical Society of Japan　78　(7)　073702　2009/07

DOI： 10.1143/JPSJ.78.073702 　

ISSN： 0031-9015 1347-4073
Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe2As2 Peer-reviewed

T. Sato, K. Nakayama, Y. Sekiba, P. Richard, Y. -M. Xu, S. Souma, T. Takahashi, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding

PHYSICAL REVIEW LETTERS　103　(4)　047002　2009/07

DOI： 10.1103/PhysRevLett.103.047002 　

ISSN： 0031-9007
Evolution of a Pairing-Induced Pseudogap from the Superconducting Gap of (Bi,Pb)(2)Sr2CuO6 Peer-reviewed

K. Nakayama, T. Sato, Y. Sekiba, K. Terashima, P. Richard, T. Takahashi, K. Kudo, N. Okumura, T. Sasaki, N. Kobayashi

PHYSICAL REVIEW LETTERS　102　(22)　227006　2009/06

DOI： 10.1103/PhysRevLett.102.227006 　

ISSN： 0031-9007

eISSN： 1079-7114
Fermi surface nesting induced strong pairing in iron-based superconductors Peer-reviewed

K. Terashima, Y. Sekiba, J. H. Bowen, K. Nakayama, T. Kawahara, T. Sato, P. Richard, Y. -M. Xu, L. J. Li, G. H. Cao, Z. -A. Xu, H. Ding, T. Takahashi

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　106　(18)　7330-7333　2009/05

DOI： 10.1073/pnas.0900469106 　

ISSN： 0027-8424
Doping dependence of the gap anisotropy of the high-temperature YBa2Cu3O7-delta superconductor Peer-reviewed

K. Nakayama, T. Sato, K. Terashima, T. Arakane, T. Takahashi, M. Kubota, K. Ono, T. Nishizaki, Y. Takahashi, N. Kobayashi

PHYSICAL REVIEW B　79　(14)　2009/04

DOI： 10.1103/PhysRevB.79.140503 　

ISSN： 2469-9950

eISSN： 2469-9969
Doping dependence of superconducting-gap anisotropy in YBa2Cu3O7-δ Peer-reviewed

K. Nakayama, T. Sato, K. Terashima, T. Arakane, T. Takahashi, M. Kubota, K. Ono, T. Nishizaki, Y. Takahashi, N. Kobayashi

Phys. Rev. B　79　140503R　2009/04
Electronic structure of heavily electron-doped BaFe1.7Co0.3As2 studied by angle-resolved photoemission Invited Peer-reviewed

Y. Sekiba, T. Sato, K. Nakayama, K. Terashima, P. Richard, J. H. Bowen, H. Ding, Y-M Xu, L. J. Li, G. H. Cao, Z-A Xu, T. Takahashi

NEW JOURNAL OF PHYSICS　11　025020　2009/02

DOI： 10.1088/1367-2630/11/2/025020 　

ISSN： 1367-2630
High-Resolution Photoemission Study of NaV2O4 Peer-reviewed

Tian Qian, Kosuke Nakayama, Yujie Sun, Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Kazunari Yamaura, Eiji Takayama-Muromachi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　78　(2)　024709　2009/02

DOI： 10.1143/JPSJ.78.024709 　

ISSN： 0031-9015
Angle-Resolved Photoemission Spectroscopy of the Fe-Based Ba0.6K0.4Fe2As2 High Temperature Superconductor: Evidence for an Orbital Selective Electron-Mode Coupling Peer-reviewed

P. Richard, T. Sato, K. Nakayama, S. Souma, T. Takahashi, Y. -M. Xu, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding

PHYSICAL REVIEW LETTERS　102　(4)　047003　2009/01

DOI： 10.1103/PhysRevLett.102.047003 　

ISSN： 0031-9007
Three-dimensional band structure of highly metallic Na0.8WO3 by angle-resolved photoemission spectroscopy Peer-reviewed

Satyabrata Raj, Anirban Chakraborty, Debraj Choudhury, Takafumi Sato, Takashi Takahashi, Priya Mahadevan, Jun Fujii, Ivana Vobornik, D. D. Sarma

PHYSICAL REVIEW B　79　(3)　035119　2009/01

DOI： 10.1103/PhysRevB.79.035119 　

ISSN： 1098-0121

eISSN： 1550-235X
Superconducting gap symmetry of Ba0.6K0.4Fe 2As2 studied by angle-resolved photoemission spectroscopy Peer-reviewed

K. Nakayama, T. Sato, P. Richard, Y. M. Xu, Y. Sekiba, S. Souma, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding, T. Takahashi

EPL　85　(6)　67002　2009

DOI： 10.1209/0295-5075/85/67002 　

ISSN： 0295-5075 1286-4854
Fermi-surface-dependent superconducting gap in C6Ca Peer-reviewed

K. Sugawara, T. Sato, T. Takahashi

NATURE PHYSICS　5　(1)　40-43　2009/01

DOI： 10.1038/NPHYS1128 　

ISSN： 1745-2473
Many-body interactions in hole-doped high-T-c cuprates studied by high-resolution ARPES Peer-reviewed

T. Sato, K. Terashima, K. Nakayama, T. Arakane, H. Matsui, T. Takahashi

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　69　(12)　2949-2955　2008/12

DOI： 10.1016/j.jpcs.2008.06.016 　

ISSN： 0022-3697

eISSN： 1879-2553
Quasiparticle lifetime in graphite studied by ultrahigh-resolution ARPES Peer-reviewed

K. Sugawara, T. Sato, S. Souma, T. Takahashi, H. Suematsu

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　69　(12)　2996-2999　2008/12

DOI： 10.1016/j.jpcs.2008.06.008 　

ISSN： 0022-3697
High-resolution angle-resolved photoemission study of bulk electronic states in YBa2Cu3O7-delta Peer-reviewed

K. Nakayama, T. Sato, T. Takahashi, T. Nishizaki, Y. Takahashi, N. Kobayashi

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　69　(12)　2967-2970　2008/12

DOI： 10.1016/j.jpcs.2008.06.019 　

ISSN： 0022-3697
Coexistence of Competing Orders with Two Energy Gaps in Real and Momentum Space in the High Temperature Superconductor Bi(2)Sr(2-x)La(x)CuO(6+delta) Peer-reviewed

J. -H. Ma, Z. -H. Pan, F. C. Niestemski, M. Neupane, Y. -M. Xu, P. Richard, K. Nakayama, T. Sato, T. Takahashi, H. -Q. Luo, L. Fang, H. -H. Wen, Ziqiang Wang, H. Ding, V. Madhavan

PHYSICAL REVIEW LETTERS　101　(20)　207002　2008/11

DOI： 10.1103/PhysRevLett.101.207002 　

ISSN： 0031-9007
Fermi arc in the superconducting state of impurity-doped Bi2 Sr2 CaCu2 O8 Peer-reviewed

T. Sato, K. Terashima, K. Nakayama, S. Souma, T. Takahashi, T. Yamamoto, K. Kadowaki

Physical Review B - Condensed Matter and Materials Physics　78　(10)　2008/09/04

DOI： 10.1103/PhysRevB.78.100502 　

ISSN： 1098-0121 1550-235X
Fermi Arc in The Superconducting State of Impurity-Doped High-Temperature Superconductors Peer-reviewed

T., Sato, K., Terashima, K., Nakayama, S., Souma, T., Takahashi, T., Yamamoto, K., Kadowaki

Phys. Rev. B　78　(10)　100502(1-4)　2008/09
Publisher: APS
DOI： 10.1103/PhysRevB.78.100502 　
Fermi arc in the superconducting state of impurity-doped Bi2Sr2CaCu2O8 Peer-reviewed

T. Sato, K. Terashima, K. Nakayama, S. Souma, T. Takahashi, T. Yamamoto, K. Kadowaki

PHYSICAL REVIEW B　78　(10)　100502R-1--4　2008/09

DOI： 10.1103/PhysRevB.78.100502 　

ISSN： 2469-9950

eISSN： 2469-9969
Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs Peer-reviewed

Takafumi Sato, Seigo Souma, Kosuke Nakayama, Kensei Terashima, Katsuaki Sugawara, Takashi Takahashi, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　77　(6)　063708-1--3　2008/06

DOI： 10.1143/JPSJ.77.063708 　

ISSN： 0031-9015
Doping induced evolution of fermi surface in low carrier superconductor Tl-doped PbTe Peer-reviewed

K. Nakayama, T. Sato, T. Takahashi, H. Murakami

PHYSICAL REVIEW LETTERS　100　(22)　227004-1--4　2008/06

DOI： 10.1103/PhysRevLett.100.227004 　

ISSN： 0031-9007
Direct evidence for hidden one-dimensional Fermi surface of hexagonal K0.25WO3 Peer-reviewed

S. Raj, T. Sato, S. Souma, T. Takahashi, D. D. Sarma, Priya Mahadevan, J. C. Campuzano, M. Greenblatt, W. H. McCarroll

PHYSICAL REVIEW B　77　(24)　245120-1--5　2008/06

DOI： 10.1103/PhysRevB.77.245120 　

ISSN： 1098-0121

eISSN： 1550-235X
Band structure and Fermi surface of heavy Fermion compounds Ce2TIn8 (T = Co, Rh, In) studied by angle-resolved photoemission spectroscopy Peer-reviewed

S. Souma, S. Raj, J. C. Campuzano, T. Sato, T. Takahashi, S. Ohara, S. Sakamoto

PHYSICA B-CONDENSED MATTER　403　(5-9)　752-754　2008/04

DOI： 10.1016/j.physb.2007.10.026 　

ISSN： 0921-4526
Universal character of CoO2 plane studied by high-resolution angle-resolved photoemission Peer-reviewed

T. Arakane, T. Sato, T. Takahashi, H. Ding, T. Fujii, A. Asamitsu

PHYSICA B-CONDENSED MATTER　403　(5-9)　1086-1088　2008/04

DOI： 10.1016/j.physb.2007.10.092 　

ISSN： 0921-4526
Low-energy excitations in graphite studied by ultrahigh-resolution angle-resolved photoemission spectroscopy Peer-reviewed

K. Sugawara, T. Sato, S. Souma, T. Takahashi, H. Suematsu

PHYSICA B-CONDENSED MATTER　403　(5-9)　1531-1533　2008/04

DOI： 10.1016/j.physb.2007.10.181 　

ISSN： 0921-4526
Effect of Zn impurities on the electronic structure of La1.85 Sr0.15 Cu O4 studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

Kensei Terashima, Takafumi Sato, Kosuke Nakayama, Toshiyuki Arakane, Takashi Takahashi, Maiko Kofu, Kazuma Hirota

Physical Review B - Condensed Matter and Materials Physics　77　(9)　2008/03/04

DOI： 10.1103/PhysRevB.77.092501 　

ISSN： 1098-0121 1550-235X
Effect of Zn impurities on the electronic structure of La1.85Sr0.15CuO4 studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

Kensei Terashima, Takafumi Sato, Kosuke Nakayama, Toshiyuki Arakane, Takashi Takahashi, Maiko Kofu, Kazuma Hirota

PHYSICAL REVIEW B　77　(9)　092501-1--4　2008/03

DOI： 10.1103/PhysRevB.77.092501 　

ISSN： 2469-9950

eISSN： 2469-9969
Cooperative structural and Peierls transition of indium chains on Si(111) Peer-reviewed

Y. J. Sun, S. Agario, S. Souma, K. Sugawara, Y. Tago, T. Sato, T. Takahashi

PHYSICAL REVIEW B　77　(12)　125115-1--4　2008/03

DOI： 10.1103/PhysRevB.77.125115 　

ISSN： 1098-0121
24pWQ-5 Pseudogap of impurity-substituted Bi2212 studied by high-resolution ARPES

Terashima,K, Nakayama,K, Arakane,T, Sekiba,Y, Sato,T, Takahashi,T, Yamamoto,T, Kadowaki,K

Meeting abstracts of the Physical Society of Japan　63　(1)　606　2008/02
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pWQ-6 Superconducting gap of impurity-substituted Bi_2Sr_2CaCu_2O_8 studied by Xe-plasma-light ARPES

Sato,T, Terashima,K, Nakayama,K, Souma,S, Takahashi,T, Yamamoto,T, Kadowaki,K

Meeting abstracts of the Physical Society of Japan　63　(1)　606　2008/02
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba(0.6)K(0.4)Fe(2)As(2) Peer-reviewed

H. Ding, P. Richard, K. Nakayama, K. Sugawara, T. Arakane, Y. Sekiba, A. Takayama, S. Souma, T. Sato, T. Takahashi, Z. Wang, X. Dai, Z. Fang, G. F. Chen, J. L. Luo, N. L. Wang

EPL　83　(4)　47001-1--4　2008

DOI： 10.1209/0295-5075/83/47001 　

ISSN： 0295-5075
Doping dependence of pseudogap in LaFeAsO1-xFx Peer-reviewed

T. Sato, K. Nakayama, Y. Sekiba, T. Arakane, K. Terashima, S. Souma, T. Takahashi, Y. Kamihara, M. Hirano, H. Hosono

Journal of the Physical Society of Japan　77　(C)　65-68　2008
Publisher: Physical Society of Japan
DOI： 10.1143/JPSJS.77SC.65 　

ISSN： 1347-4073 0031-9015
High-intensity xenon plasma discharge lamp for bulk-sensitive high-resolution photoemission spectroscopy Peer-reviewed

S. Souma, T. Sato, T. Takahashi, P. Baltzer

REVIEW OF SCIENTIFIC INSTRUMENTS　78　(12)　123104-1--4　2007/12

DOI： 10.1063/1.2818806 　

ISSN： 0034-6748
Universality of low-energy mass renormalization in the superconducting state of hole-doped high-T-c superconductors Peer-reviewed

Takafumi Sato, Kensei Terashima, Kosuke Nakayama, Hiroaki Matsui, Takashi Takahashi, Kazuo Kadowaki, Maiko Kofu, Kazuma Hirota

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　76　(10)　103707-1--4　2007/10

DOI： 10.1143/JPSJ.76.103707 　

ISSN： 0031-9015
Origin of shadow bands in high-T-c cuprate superconductors studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

K. Nakayama, T. Dobashi, T. Sato, T. Takahashi, T. Kondo, T. Takeuchi, K. Kudo, N. Kobayashi

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　463　48-51　2007/10

DOI： 10.1016/j.physc.2007.04.227 　

ISSN： 0921-4534

eISSN： 1873-2143
Single-particle excitation gap in La2-xSrxCuO4 studied by high-resolution angle-resolved photoemission Peer-reviewed

Y. X. Xiao, T. Sato, K. Terashima, H. Matsui, T. Takahashi, M. Kofu, K. Hirota

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　463　44-47　2007/10

DOI： 10.1016/j.physc.2007.03.434 　

ISSN： 0921-4534

eISSN： 1873-2143
Electronic structure of MxCoO2 (M : Na, K, and Rb) studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

T. Arakane, T. Sato, T. Takahashi, T. Fujii, A. Asamitsu

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　463　149-151　2007/10

DOI： 10.1016/j.physc.2007.03.502 　

ISSN： 0921-4534
Anomalous superconducting-gap symmetry of noncentrosymmetric La(2)C(3) observed by ultrahigh-resolution photoemission spectroscopy Peer-reviewed

K. Sugawara, T. Sato, S. Souma, T. Takahashi, A. Ochiai

PHYSICAL REVIEW B　76　(13)　132512-1--4　2007/10

DOI： 10.1103/PhysRevB.76.132512 　

ISSN： 1098-0121
Xenon-plasma-light low-energy ultrahigh-resolution photoemission study of Co(S1-xSex)(2) (x=0.075) Peer-reviewed

Takafumi Sato, Seigo Souma, Katsuaki Sugawara, Kosuke Nakayama, Satyabrata Raj, Haruhiro Hiraka, Takashi Takahashi

PHYSICAL REVIEW B　76　(11)　113102-1--3　2007/09

DOI： 10.1103/PhysRevB.76.113102 　

ISSN： 1098-0121
Photoemission study of the superconducting-gap symmetry in electron-doped high-T-c superconductors Peer-reviewed

H. Matsui, T. Sato, T. Takahashi, K. Nakayama, K. Terashima, M. Fujita, K. Yamada

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　460　862-863　2007/09

DOI： 10.1016/j.physc.2007.03.155 　

ISSN： 0921-4534
Bogoliubov quasiparticle and low-energy dispersion kink in the superconducting state of La1.85Sr0.15CuO4 Peer-reviewed

T. Sato, K. Terashima, K. Nakyama, T. Takahashi, K. Kadowaki, M. Kofu, K. Hirota

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　460　864-865　2007/09

DOI： 10.1016/j.physc.2007.03.087 　

ISSN： 0921-4534
Origin of shadow bands in single-layered Bi2Sr2CUO6+delta studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

K. Nakayama, T. Sato, T. Dobashi, T. Takahashi, T. Kondo, T. Takeuchi, K. Kudo, N. Kobayashi

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　460　931-933　2007/09

DOI： 10.1016/j.physc.2007.03.328 　

ISSN： 0921-4534
Magnetic isotope effect in Bi2Sr2CaCu2O8+delta studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

K. Terashima, T. Sato, H. Matsui, T. Takahashi, H. Ding, T. Yamamoto, K. Kadowaki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　460　934-936　2007/09

DOI： 10.1016/j.physc.2007.03.329 　

ISSN： 0921-4534
22aTQ-7 Xenon-plasma-light bulk-sensitive ultrahigh-resolution ARPES study of Bi-based cuprates

Sato,T, Terashima,K, Nakayama,K, Souma,S, Takahashi,T, Kudo,K, Sasaki,T, Kobayashi,N, Yamamoto,T, Kadowaki,K

Meeting abstracts of the Physical Society of Japan　62　(2)　744　2007/08
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pWG-3 Xenon-plasma-light bulk-sensitive ultrahigh-resolution pnotoemission study of impurity-substituted Bi2212

Terashima,K, Sato,T, Nakayama,K, Souma,S, Takahashi,T, Yamamoto,T, Kadowaki,K

Meeting abstracts of the Physical Society of Japan　62　(2)　552　2007/08
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Anomalous momentum dependence of the superconducting coherence peak and its relation to the pseudogap of La1.85Sr0.15CuO4 Peer-reviewed

K. Terashima, H. Matsui, T. Sato, T. Takahashi, M. Kofu, K. Hirota

PHYSICAL REVIEW LETTERS　99　(1)　17003-1-17003-4　2007/07

DOI： 10.1103/PhysRevLett.99.017003 　

ISSN： 0031-9007

eISSN： 1079-7114
Electronic structure of quasi-one-dimensional conductors Nb3X4 (X=S,Se,Te) studied by angle-resolved photoemission spectroscopy Peer-reviewed

T. Dobashi, T. Sato, S. Souma, T. Takahashi, H. Kaneko, Y. Ishihara, H. Okamoto

PHYSICAL REVIEW B　76　(4)　045121-1-045121-8　2007/07

DOI： 10.1103/PhysRevB.76.045121 　

ISSN： 1098-0121
Evolution of the pseudogap across the magnetic-superconducting phase boundary of Nd2-xCexCuO4 Peer-reviewed

H. Matsui, T. Takahashi, T. Sato, K. Terashima, H. Ding, M. Fujita, K. Yamada

Phys. Rev. B　75　224514-1-224514-5　2007/06/29

DOI： 10.1103/PhysRevB.75.224514 　
Fermi surface and band dispersions of MxCoO2 (M : Na, K, and Rb) studied by angle-resolved photoemission spectroscopy Peer-reviewed

Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Hong Ding, Takenori Fujii, Atsushi Asamitsu

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　76　(5)　054704-1-054704-4　2007/05

DOI： 10.1143/JPSJ.76.054704 　

ISSN： 0031-9015
Electronic structure of sodium tungsten bronzes NaxWO3 by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

S. Raj, H. Matsui, S. Souma, T. Sato, T. Takahashi, A. Chakraborty, D. D. Sarma, P. Mahadevan, S. Oishi, W. H. McCarroll, M. Greenblatt

PHYSICAL REVIEW B　75　(15)　155116-1-155116-7　2007/04

DOI： 10.1103/PhysRevB.75.155116 　

ISSN： 1098-0121

eISSN： 1550-235X
Anisotropic spin-orbit interaction in Sb(111) surface studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

K. Sugawara, T. Sato, S. Souma, T. Takahashi, M. Arai, T. Sasaki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　2177-2179　2007/03

DOI： 10.1016/j.jmmm.2006.11.119 　

ISSN： 0304-8853
Metal-insulator transition in sodium tungsten bronzes, NaxWO3, studied by angle-resolved photoemission spectroscopy Peer-reviewed

S. Raj, D. Hashimoto, H. Matsui, S. Souma, T. Sato, T. Takahashi, S. Ray, A. Chakraborty, D. D. Sarma, P. Mahadevan, S. Oishi, W. H. McCarroll, M. Greenblatt

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　E231-E233　2007/03

DOI： 10.1016/j.jmmm.2006.10.1077 　

ISSN： 0304-8853

eISSN： 1873-4766
Electronic structure of LaAgSb2 and CeAgSb2 studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

T. Arakane, T. Sato, S. Souma, T. Takahashi, Y. Watanabe, Y. Inada

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　396-398　2007/03

DOI： 10.1016/j.jmmm.2006.10.101 　

ISSN： 0304-8853
Many-body interaction in hole- and electron-doped high-Tc cuprate superconductors Peer-reviewed

T. Takahashi, T. Sato, H. Matsui

Lecture Notes in Physics　715　271-293　2007

DOI： 10.1007/3-540-68133-7_10 　

ISSN： 0075-8450
Bulk and surface low-energy excitations in YBa2Cu3O7-delta studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

K. Nakayama, T. Sato, K. Terashima, H. Matsui, T. Takahashi, M. Kubota, K. Ono, T. Nishizaki, Y. Takahashi, N. Kobayashi

PHYSICAL REVIEW B　75　(1)　014513-1-014513-7　2007/01

DOI： 10.1103/PhysRevB.75.014513 　

ISSN： 2469-9950

eISSN： 2469-9969
Anomalous quasiparticle lifetime and strong electron-phonon coupling in graphite Peer-reviewed

K. Sugawara, T. Sato, S. Souma, T. Takahashi, H. Suematsu

PHYSICAL REVIEW LETTERS　98　(3)　036801-1-036801-4　2007/01

DOI： 10.1103/PhysRevLett.98.036801 　

ISSN： 0031-9007
Shadow bands in single-layered Bi2Sr2CuO6+delta studied by angle-resolved photoemission spectroscopy Peer-reviewed

K. Nakayama, T. Sato, T. Dobashi, K. Terashima, S. Souma, H. Matsui, T. Takahashi, J. C. Campuzano, K. Kudo, T. Sasaki, N. Kobayashi, T. Kondo, T. Takeuchi, K. Kadowaki, M. Kofu, K. Hirota

PHYSICAL REVIEW B　74　(5)　054505-1-054505-6　2006/08

DOI： 10.1103/PhysRevB.74.054505 　

ISSN： 2469-9950

eISSN： 2469-9969
Evolution of the pseudogap from Fermi arcs to the nodal liquid Peer-reviewed

A. Kanigel, M. R. Norman, M. Randeria, U. Chatterjee, S. Souma, A. Kaminski, H. M. Fretwell, S. Rosenkranz, M. Shi, T. Sato, T. Takahashi, Z. Z. Li, H. Raffy, K. Kadowaki, D. Hinks, L. Ozyuzer, J. C. Campuzano

Nature Physics　2　(7)　447-451　2006/07/28
Publisher: Nature publishing group
DOI： 10.1038/nphys334 　

ISSN： 1745-2473 1745-2481
Evolution of the pseudogap from Fermi arcs to the nodal liquid Peer-reviewed

A. Kanigel, M. R. Norman, M. Randeria, U. Chatterjee, S. Souma, A. Kaminski, H. M. Fretwell, S. Rosenkranz, M. Shi, T. Sato, T. Takahashi, Z. Z. Li, H. Raffy, K. Kadowaki, D. Hinks, L. Ozyuzer, J. C. Campuzano

NATURE PHYSICS　2　(7)　447-451　2006/07

DOI： 10.1038/nphys334 　

ISSN： 1745-2473

eISSN： 1745-2481
Angle-resolved photoemission spectroscopy of the insulating NaxWO3: Anderson localization, polaron formation, and remnant Fermi surface Peer-reviewed

S Raj, D Hashimoto, H Matsui, S Souma, T Sato, T Takahashi, DD Sarma, P Mahadevan, S Oishi

PHYSICAL REVIEW LETTERS　96　(14)　1476031-1-1476031-4　2006/04

DOI： 10.1103/PhysRevLett.96.147603 　

ISSN： 0031-9007

eISSN： 1079-7114
Fermi surface and anisotropic spin-orbit coupling of sb(111) studied by angle-resolved photoemission spectroscopy Peer-reviewed

K Sugawara, T Sato, S Souma, T Takahashi, M Arai, T Sasaki

PHYSICAL REVIEW LETTERS　96　(4)　046411　2006/02

DOI： 10.1103/PhysRevLett.96.046411 　

ISSN： 0031-9007
Electronic structure of impurity-substituted Bi2Sr 2CaCu2O8+δ studied by angle-resolved photoemission spectroscopy Peer-reviewed

K. Terashima, D. Hashimoto, H. Matsui, T. Sato, T. Takahashi, T. Yamamoto, K. Kadowaki

Journal of Physics and Chemistry of Solids　67　(1-3)　271-273　2006/01

DOI： 10.1016/j.jpcs.2005.10.054 　

ISSN： 0022-3697
Fermi surface and edge-localized states in graphite studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

K Sugawara, T Sato, S Souma, T Takahashi, H Suematsu

PHYSICAL REVIEW B　73　(4)　045124　2006/01

DOI： 10.1103/PhysRevB.73.045124 　

ISSN： 1098-0121
Many-body interactions in Bi-based high-T-c cuprates studied by angle-resolved photoemission spectroscopy Peer-reviewed

T Sato, H Matsui, K Terashima, T Takahashi, H Ding, HB Yang, SC Wang, T Fujii, T Watanabe, A Matsuda, T Terashima, K Kadowaki

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　67　(1-3)　628-631　2006/01

DOI： 10.1016/j.jpcs.2005.10.089 　

ISSN： 0022-3697

eISSN： 1879-2553
ARPES study of quasiparticle state in electron-doped cuprate Nd2-xCexCuO4 Peer-reviewed

H Matsui, K Terashima, T Sato, T Takahashi, SC Wang, HB Yang, H Ding, T Uefuji, K Yamada

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　67　(1-3)　249-253　2006/01

DOI： 10.1016/j.jpcs.2005.10.036 　

ISSN： 0022-3697
Anomalous electronic states in graphite studied by angle-resolved photoemission spectroscopy Peer-reviewed

K. Sugawara, T. Sato, S. Souma, T. Takahashi, H. Suematsu

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS　7　S94-S98　2006

DOI： 10.1016/j.stam.2006.04.007 　

ISSN： 1468-6996
Impurity effects on electron-mode coupling in high-temperature superconductors Peer-reviewed

K Terashima, H Matsui, D Hashimoto, T Sato, T Takahashi, H Ding, T Yamamoto, K Kadowaki

NATURE PHYSICS　2　(1)　27-31　2006/01

DOI： 10.1038/nphys200 　

ISSN： 1745-2473
Angle-resolved photoemission spectroscopy of the metallic sodium tungsten bronzes NaxWO3

S. Raj, D. Hashimoto, H. Matsui, S. Souma, T. Sato, T. Takahashi, Sugata Ray, A. Chakraborty, D. D. Sarma, Priya Mahadevan, W. H. McCarroll, M. Greenblatt

Physical Review B - Condensed Matter and Materials Physics　72　(12)　2005/09/15

DOI： 10.1103/PhysRevB.72.125125 　

ISSN： 1098-0121 1550-235X
Angle-resolved photoemission spectroscopy of the metallic sodium tungsten bronzes NaxWO(3) Peer-reviewed

S Raj, D Hashimoto, H Matsui, S Souma, T Sato, T Takahashi, S Ray, A Chakraborty, DD Sarma, P Mahadevan, WH McCarroll, M Greenblatt

PHYSICAL REVIEW B　72　(12)　125125-1-8　2005/09

DOI： 10.1103/PhysRevB.72.125125 　

ISSN： 2469-9950

eISSN： 2469-9969
Fermi surface evolution and luttinger theorem in NaxCoO2: A systematic photoemission study Peer-reviewed

HB Yang, ZH Pan, AKP Sekharan, T Sato, S Souma, T Takahashi, R Jin, BC Sales, D Mandrus, AV Fedorov, Z Wang, H Ding

PHYSICAL REVIEW LETTERS　95　(14)　146401-1-478　2005/09

DOI： 10.1103/PhysRevLett.95.146401 　

ISSN： 0031-9007

eISSN： 1079-7114
19pYG-5 Charge order and Fermi-arc at pseudogap state in Bi2212

Terashima,K, Chatterjee,U, Kaminski,A, Kanigel,A, Fretwell,H. M, Matsui,H, Sato,T, Takahashi,T, Rosenkranz,S, Li,Z. Z, Raffy,H, SantanderSyro,A, Yamamoto,T, Kadowaki,K, Norman,M. R, Randeria,M, Campuzano,J. C

Meeting abstracts of the Physical Society of Japan　60　(2)　386　2005/08
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Direct observation of a nonmonotonic d(x)(-y)(2)(2) - Wave superconducting gap in the electron-doped High-T-c superconductor Pr0.89LaCe0.11CuO4 Peer-reviewed

H Matsui, K Terashima, T Sato, T Takahashi, M Fujita, K Yamada

PHYSICAL REVIEW LETTERS　95　(1)　017003-1-478　2005/07

DOI： 10.1103/PhysRevLett.95.017003 　

ISSN： 0031-9007
Electronic structure of eta-Mo4O11 studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

T Sato, T Dobashi, H Komatsu, T Takahashi, M Koyano

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　144　549-552　2005/06

DOI： 10.1016/j.elspec.2005.01.286 　

ISSN： 0368-2048
High-resolution photoemission study of ZrZn2 Peer-reviewed

T Sato, Y Iida, S Souma, T Takahashi, S Minagawa, N Kimura, H Aoki

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　144　889-891　2005/06

DOI： 10.1016/j.elspec.2005.01.131 　

ISSN： 0368-2048

eISSN： 1873-2526
High-resolution angle-resolved photoemission study of layered transition-metal dichalcogenides Nb(1-x)Ti(x)Xc(2) (Xc = S, Se, Te) Peer-reviewed

T Sato, H Komatsu, K Terashima, T Takahashi, M Shimakawa, K Hayashi

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　144　633-637　2005/06

DOI： 10.1016/j.elspec.2005.01.243 　

ISSN： 0368-2048
Direct observation of superconducting gap in YB6 by ultrahigh-resolution photoemission spectroscopy Peer-reviewed

S Souma, H Komoda, Y Iida, T Sato, T Takahashi, S Kunii

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　144　503-506　2005/06

DOI： 10.1016/j.elspec.2005.01.125 　

ISSN： 0368-2048
Electronic band structure of AlB2 studied by angle-resolved photoemission spectroscopy Peer-reviewed

S Souma, T Sato, T Takahashi, N Kimura, H Aoki

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　144　545-547　2005/06

DOI： 10.1016/j.elspec.2005.01.126 　

ISSN： 0368-2048
Angle-resolved and resonant photoemission spectroscopy on heavy-fermion superconductors Ce2CoIn8 and Ce2RhIn8 Peer-reviewed

S Raj, Y Iida, S Souma, T Sato, T Takahashi, H Ding, S Ohara, T Hayakawa, GF Chen, Sakamoto, I, H Harima

PHYSICAL REVIEW B　71　(22)　224516-1-9　2005/06

DOI： 10.1103/PhysRevB.71.224516 　

ISSN： 2469-9950

eISSN： 2469-9969
Ultrahigh-resolution photoemission study of h-ZrRuP Peer-reviewed

H Matsui, D Hashimoto, S Souma, T Sato, T Takahashi, Shirotani, I

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　74　(5)　1401-1403　2005/05

DOI： 10.1143/JPSJ.74.1401 　

ISSN： 0031-9015
High-resolution ARPES study of quasi-particles in high-T-c superconductors Peer-reviewed

T Takahashi, T Sato, H Matsui, K Terashima

NEW JOURNAL OF PHYSICS　7　105-1-105-10　2005/04

DOI： 10.1088/1367-2630/7/1/105 　

ISSN： 1367-2630
Angle-resolved photoemission spectroscopy of the antiferromagnetic superconductor Nd1.87Ce0.13CuO4: Anisotropic spin-correlation gap, pseudogap, and the induced quasiparticle mass enhancement Peer-reviewed

H Matsui, K Terashima, T Sato, T Takahashi, SC Wang, HB Yang, H Ding, T Uefuji, K Yamada

PHYSICAL REVIEW LETTERS　94　(4)　047005-1-047005-4　2005/02

DOI： 10.1103/PhysRevLett.94.047005 　

ISSN： 0031-9007
Momentum anisotropy of the scattering rate in cuprate superconductors Peer-reviewed

A. Kaminski, H. M. Fretwell, M. R. Norman, M. Randeria, S. Rosenkranz, U. Chatterjee, J. C. Campuzano, J. Mesot, T. Sato, T. Takahashi, T. Terashima, M. Takano, K. Kadowaki, Z. Z. Li, H. Raffy

Physical Review B - Condensed Matter and Materials Physics　71　(1)　2005/01

DOI： 10.1103/PhysRevB.71.014517 　

ISSN： 1098-0121 1550-235X
Momentum anisotropy of the scattering rate in cuprate superconductors Peer-reviewed

A Kaminski, HM Fretwell, MR Norman, M Randeria, S Rosenkranz, U Chatterjee, JC Campuzano, J Mesot, T Sato, T Takahashi, T Terashima, M Takano, K Kadowaki, ZZ Li, H Raffy

PHYSICAL REVIEW B　71　(1)　014517-1-014517-7　2005/01

DOI： 10.1103/PhysRevB.71.014517 　

ISSN： 2469-9950

eISSN： 2469-9969
Three-dimensional Fermi-surface nesting in 1T-VSe2 studied by angle-resolved photoemission spectroscopy Peer-reviewed

T Sato, K Terashima, S Souma, H Matsui, T Takahashi, HB Yang, SC Wang, H Ding, N Maeda, K Hayashi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　73　(12)　3331-3334　2004/12

DOI： 10.1143/JPSJ.73.3331 　

ISSN： 0031-9015
Electronic structure of layered transition-metal dichalcogenides Nb(1-x)Ti(x)Xc(2) (Xc = S, Se, Te) studied by angle-resolved photoemission spectroscopy Peer-reviewed

T Sato, H Komatsu, K Terashima, T Takahashi, M Shimakawa, K Hayashi

JOURNAL OF PHYSICS-CONDENSED MATTER　16　(47)　8599-8608　2004/12

DOI： 10.1088/0953-8984/16/47/012 　

ISSN： 0953-8984
High-resolution angle-resolved photoemission study of incommensurate charge-density-wave compound CeTe3 Peer-reviewed

H Komoda, T Sato, S Souma, T Takahashi, Y Ito, K Suzuki

PHYSICAL REVIEW B　70　(19)　195101　2004/11

DOI： 10.1103/PhysRevB.70.195101 　

ISSN： 1098-0121
Magnetic interaction in hole-doped high- Tc superconductors observed by angle-resolved photoemission spectroscopy Peer-reviewed

T. Sato, H. Matsui, K. Terashima, T. Takahashi, H. Ding, H. B. Yang, S. C. Wang, T. Fujii, T. Watanabe, A. Matsuda, T. Terashima, K. Kadowaki

Physica C: Superconductivity and its Applications　412-414　51-58　2004/10

DOI： 10.1016/j.physc.2003.11.063 　

ISSN： 0921-4534
Fermi surface topology of Ca1.5Sr0.5RuO4 determined by angle-resolved photoelectron spectroscopy Peer-reviewed

SC Wang, HB Yang, AKP Sekharan, S Souma, H Matsui, T Sato, T Takahashi, CX Lu, JD Zhang, R Jin, D Mandrus, EW Plummer, Z Wang, H Ding

PHYSICAL REVIEW LETTERS　93　(17)　177007　2004/10

DOI： 10.1103/PhysRevLett.93.177007 　

ISSN： 0031-9007
Band structure and Fermi surface of CeB6 studied by angle-resolved photoemission spectroscopy Peer-reviewed

S Souma, Y Iida, T Sato, T Takahashi, S Kunii

PHYSICA B-CONDENSED MATTER　351　(3-4)　283-285　2004/09

DOI： 10.1016/j.physb.2004.06.026 　

ISSN： 0921-4526
High-resolution angle-resolved photoemission study of LaRh3B2 Peer-reviewed

Y Iida, S Souma, T Sato, T Takahashi, M Yamada, T Okubo, T Shiromoto, Y Inada, R Settai, Y Onuki

PHYSICA B-CONDENSED MATTER　351　(3-4)　271-273　2004/09

DOI： 10.1016/j.physb.2004.06.023 　

ISSN： 0921-4526

eISSN： 1873-2135
High-resolution angle-resolved photoemission study of impurity-substituted Bi2Sr2CaCu2O8+delta Peer-reviewed

K Terashima, H Matsui, T Sato, T Takahashi, T Yamamoto, K Kadowaki

PHYSICA B-CONDENSED MATTER　351　(3-4)　280-282　2004/09

DOI： 10.1016/j.physb.2004.06.029 　

ISSN： 0921-4526
13pRA-6 Dispersion kink in the band structure of impurity-substituted Bi_2Sr_2CaCu_2O_8 : Angle-resolved photoemission spectroscopy

Terashima,K, Hashimoto,D, Matsui,H, Sato,T, Takahashi,T, Yamamoto,T, Kadowaki,K

Meeting abstracts of the Physical Society of Japan　59　(2)　490　2004/08
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Spectral evidence for Bogoliubov quasiparticle in triple-layered high-T-c superconductor Bi2Sr2Ca2Cu3O10 Peer-reviewed

H Matsui, T Sato, T Takahashi, SC Wang, HB Yang, H Ding, T Fujii, T Watanabe, A Matsuda

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　408　814-815　2004/08

DOI： 10.1016/j.physc.2004.03.142 　

ISSN： 0921-4534

eISSN： 1873-2143
Fermi surface, superconducting gap, and many-body effects in Bi2Sr2Can-1CunO2n+4 (n=1-3) Peer-reviewed

T Sato, H Matsui, T Takahashi, H Ding, HB Yang, SC Wang, T Fujii, T Watanabe, A Matsuda, T Terashima, K Kadowaki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　408　812-813　2004/08

DOI： 10.1016/j.physc.2004.03.141 　

ISSN： 0921-4534

eISSN： 1873-2143
Direct observation of superconducting gaps in MgB2 by angle-resolved photoemission spectroscopy Peer-reviewed

S Souma, Y Machida, T Sato, T Takahashi, H Matsui, SC Wang, H Ding, A Kaminski, JC Campuzano, S Sasaki, K Kadowaki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　408　102-103　2004/08

DOI： 10.1016/j.physc.2004.02.054 　

ISSN： 0921-4534
X-ray angle-resolved photoemission spectroscopy of CaB6 Peer-reviewed

S Souma, T Takahashi, H Komatsu, T Sato, H Matsui, N Kimura, H Aoki, S Kunii, J Akimitsu

PHYSICAL REVIEW B　70　(7)　073104　2004/08

DOI： 10.1103/PhysRevB.70.073104 　

ISSN： 1098-0121
Identifying the background signal in angle-resolved photoemission spectra of high-temperature cuprate superconductors Peer-reviewed

A. Kaminski, S. Rosenkranz, H. M. Fretwell, J. Mesot, M. Randeria, J. C. Campuzano, M. R. Norman, Z. Z. Li, H. Raffy, T. Sato, T. Takahashi, K. Kadowaki

Physical Review B - Condensed Matter and Materials Physics　69　(21)　1-212509　2004/06

DOI： 10.1103/PhysRevB.69.212509 　

ISSN： 0163-1829
ARPES on Na0.6CoO2: Fermi surface and unusual band dispersion Peer-reviewed

HB Yang, SC Wang, AKP Sekharan, H Matsui, S Souma, T Sato, T Takahashi, T Takeuchi, JC Campuzano, R Jin, BC Sales, D Mandrus, Z Wang, H Ding

PHYSICAL REVIEW LETTERS　92　(24)　246403　2004/06

DOI： 10.1103/PhysRevLett.92.246403 　

ISSN： 0031-9007

eISSN： 1079-7114
Identifying the background signal in angle-resolved photoemission spectra of high-temperature cuprate superconductors Peer-reviewed

A Kaminski, S Rosenkranz, HM Fretwell, J Mesot, M Randeria, JC Campuzano, MR Norman, ZZ Li, H Raffy, T Sato, T Takahashi, K Kadowaki

PHYSICAL REVIEW B　69　(21)　212509　2004/06

DOI： 10.1103/PhysRevB.69.212509 　

ISSN： 1098-0121

eISSN： 1550-235X
28pXE-10 Impurity-effects on Bi_2Sr_2CaCu_2O_<8+δ> : Angle-resolved photoemission spectroscopy

Terashima,K, Hashimoto,D, Matsui,H, Sato,T, Takahashi,T, Yamamoto,T, Kadowaki,K

Meeting abstracts of the Physical Society of Japan　59　(1)　596　2004/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Systematics of electronic structure and interactions in Bi2Sr2Can-1CunO2n+4 (n=1-3) by angle-resolved photoemission spectroscopy Peer-reviewed

H. Matsui, T. Sato, T. Takahashi, H. Ding, H.-B. Yang, S.-C. Wang, T. Fujii, T. Watanabe, A. Matsuda, T. Terashima, K. Kadowaki

Phys. Rev. B　67　060501R　2003/12
BCS-like Bogoliubov quasiparticles in high-Tc superconductors observed by angle-resolved photoemission spectroscopy Peer-reviewed

H. Matsui, T. Sato, T. Takahashi, S.-C. Wang, H.-B. Yang, H. Ding, T. Fujii, T. Watanabe, A Matsuda

Phys. Rev. Lett.　90　217002　2003/12
Low energy excitation in Bi2Sr2Can-1CunO2n+4 (n = 1-3) studied by high-resolution ARPES Peer-reviewed

H. Matsui, T. Takahashi, T. Sato, H. Ding, H.-B. Yang, S.-C. Wang, T. Fujii, T. Watanabe, A. Matsuida, T. Terashima, K. Kadowaki

International Journal of Modern Physics B　17　3554-3558　2003/12
Charge-density-wave transition of 1T-VSe2 studied by angle-resolved photoemission spectroscopy Peer-reviewed

K. Terashima, T. Sato, H. Komatsu, T. Takahashi, N. Maeda, K. Hayashi

Phys. Rev. B　68　155108　2003/12
Direct evidence for superconducting quasiparticle in triple-layered high-T-c superconductor Invited Peer-reviewed

T Takahashi, H Matsui, T Sato, SC Wang, HB Yang, H Ding, T Fujii, T Watanabe, A Matsuda

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　388　305-306　2003/05

DOI： 10.1016/S0921-4534(02)02459-0 　

ISSN： 0921-4534
The origin of multiple superconducting gaps in MgB2 Peer-reviewed

S Souma, Y Machida, T Sato, T Takahashi, H Matsui, SC Wang, H Ding, A Kaminski, JC Campuzano, S Sasaki, K Kadowaki

NATURE　423　(6935)　65-67　2003/05

DOI： 10.1038/nature01619 　

ISSN： 0028-0836

eISSN： 1476-4687
Systematics of electronic structure and interactions in (formula presented) by angle-resolved photoemission spectroscopy Peer-reviewed

H. Matsui, T. Sato, T. Takahashi, H. Ding, H. B. Yang, S. C. Wang, T. Fujii, A. Matsuda, T. Watanabe, A. Matsuda, T. Terashima, K. Kadowaki, T. Fujii, T. Watanabe

Physical Review B - Condensed Matter and Materials Physics　67　(6)　2003/02/28

DOI： 10.1103/PhysRevB.67.060501 　

ISSN： 1550-235X 1098-0121
BCS-Like Bogoliubov Quasiparticles in High-[Formula presented] Superconductors Observed by Angle-Resolved Photoemission Spectroscopy Peer-reviewed

H. Matsui, T. Sato, T. Takahashi, S. C. Wang, H. B. Yang, H. Ding, T. Fujii, T. Watanabe, A. Matsuda

Physical Review Letters　90　(21)　4　2003

DOI： 10.1103/PhysRevLett.90.217002 　

ISSN： 1079-7114 0031-9007
Observation of band renormalization effects in hole-doped high-[formula presented] superconductors Peer-reviewed

T. Sato, H. Matsui, T. Takahashi, H. Ding, H. B. Yang, S. C. Wang, T. Fujii, T. Watanabe, A. Matsuda, T. Terashima, K. Kadowaki

Physical Review Letters　91　(15)　157003　2003

DOI： 10.1103/PhysRevLett.91.157003 　

ISSN： 1079-7114 0031-9007
Angle-resolved photoemission study of novel boride compounds Invited Peer-reviewed

T. Takahashi, S. Souma, T. Sato

J. Phys. Soc. Jpn.　71　5-10　2002/12
Publisher: The Physical Society of Japan
DOI： 10.1143/JPSJ.71.5 　

ISSN： 0031-9015

More details Close

We have performed high-resolution photoemission spectroscopy on newly discovered novel boride compounds, MgB₂, La-doped CaB₆, and DyB₂C₂. In MgB₂, we observed the superconducting gap of about 4.5 meV with <italic>s</italic>-wave symmetry. In La-doped CaB₆, we found a 1 eV energy gap at the X point in the Brillouin zone, in contrast with the LDA band calculation but in good agreement with the GW calculation. This requests reexamination of the excitonic-insulator model based on an overlap of an electron and a hole band at the X point. In DyB₂C₂, we found two (one electron-like and one hole-like) Fermi surfaces, which are composed of the mixed states of the B2<italic>p</italic>, C2<italic>p</italic>and Dy5<italic>d</italic>orbitals, below the antiferro-quadrupolar-ordering temperature.
High-resolution photoemission study of FeSr2YCu2O7+delta Peer-reviewed

H Matsui, T Sato, S Nishina, T Takahashi, Y Mihara, Y Hata, K Kadowaki, T Mochiku

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　63　(12)　2329-2332　2002/12

DOI： 10.1016/S0022-3697(02)00226-3 　

ISSN： 0022-3697
Low energy excitation and scaling in Bi2Sr2Can-1CunO2n+4 (n=1-3): Angle-resolved photoemission spectroscopy Peer-reviewed

T Sato, H Matsui, S Nishina, T Takahashi, T Fujii, T Watanabe, A Matsuda

PHYSICAL REVIEW LETTERS　89　(6)　067005-1-067005-4　2002/08

DOI： 10.1103/PhysRevLett.89.067005 　

ISSN： 0031-9007
High-resolution photoemission spectro-scopy for the layered antiferromagnetic (La1-zNdz)0.46Sr0.54MnO3 Peer-reviewed

Tsunehiro Takeuchi, Hiroshi Nozaki, Kazuo Soda, Takeshi Kondo, Uichiro Mizutani, Takayoshi Yokoya, Takafumi Sato, Takashi Takahashi, Shik Shin, Takayuki Muro, Yuji Saitoh, Yutaka Moritomo

Journal of Synchrotron Radiation　9　(4)　237-241　2002/07/01

DOI： 10.1107/S0909049502008889 　

ISSN： 0909-0495
Electronic structure of black SmS. I. 4d-4f resonance and angle-integrated valence-band photoemission spectroscopy Peer-reviewed

A Chainani, H Kumigashira, T Ito, T Sato, T Takahashi, T Yokoya, T Higuchi, T Takeuchi, S Shin, NK Sato

PHYSICAL REVIEW B　65　(15)　155201　2002/04

DOI： 10.1103/PhysRevB.65.155201 　

ISSN： 1098-0121
High-resolution angle-resolved photoemission study of BaCo1-xNixS2 Peer-reviewed

T. Sato, H. Kumigashira, D. Ionel, T. Ito, T. Takahashi, I. Hase, H. Ding, J. C. Campuzano, S. Shamoto

Surface Review and Letters　9　(2)　1127-1132　2002/04

DOI： 10.1142/S0218625X02003627 　

ISSN： 0218-625X
Low Energy Excitation and Scaling in [Formula presented] [Formula presented]: Angle-Resolved Photoemission Spectroscopy Peer-reviewed

T. Sato, H. Matsui, S. Nishina, T. Takahashi, T. Fujii, T. Watanabe, A. Matsuda

Physical Review Letters　89　(6)　2002

DOI： 10.1103/PhysRevLett.89.067005 　

ISSN： 1079-7114 0031-9007
Zn-substitution effects on the low-energy quasiparticles in Bi2Sr2CaCu2O8+δ studied by angle-resolved photoemission spectroscopy Peer-reviewed

S. Nishina, T. Sato, T. Takahashi, S. C. Wang, H. B. Yang, H. Ding, K. Kadowaki

Journal of Physics and Chemistry of Solids　63　(6-8)　1069-1072　2002

DOI： 10.1016/S0022-3697(02)00103-8 　

ISSN： 0022-3697
Fermi surface topology of Bi2201 studied by temperature-dependent angle-resolved photoemission spectroscopy Peer-reviewed

T. Sato, T. Kamiyama, S. Nishina, T. Takahashi, I. Chong, T. Terashima, M. Takano

Physica C: Superconductivity and its Applications　364-365　590-593　2001/11

DOI： 10.1016/S0921-4534(01)00858-9 　

ISSN： 0921-4534
Evolution of metallic states from the Hubbard band in the two-dimensional Mott system BaCo1-xNixS2 Peer-reviewed

T. Sato, H. Kumigashira, D. Ionel, T. Takahashi, I. Hase, H. Ding, J. C. Campuzano, S. Shamoto

Physical Review B - Condensed Matter and Materials Physics　64　(7)　751031-751036　2001/08/15

DOI： 10.1103/PhysRevB.64.075103 　

ISSN： 0163-1829
Evidence for a hole-like Fermi surface of Bi2Sr2CuO6 from temperature-dependent angle-resolved photoemission spectroscopy Invited Peer-reviewed

T. Sato, T. Kamiyama, T. Takahashi, J. Mesot, A. Kaminski, J. C. Campuzano, H. M. Fretwell, T. Takeuchi, H. Ding, I. Chong, T. Terashima, M. Takano

Physical Review B - Condensed Matter and Materials Physics　64　(5)　0545021-0545025　2001/08/01

DOI： 10.1103/PhysRevB.64.054502 　

ISSN： 0163-1829
High-resolution photoemission study of MgB2 Peer-reviewed

T. Takahashi, T. Sato, S. Souma, T. Muranaka, J. Akimitsu

Physical Review Letters　86　(21)　4915-4917　2001/05/21

DOI： 10.1103/PhysRevLett.86.4915 　

ISSN： 0031-9007
Fermi surface and superconducting gap in superstructure-free Bi1.80Pb0.38Sr2.01CuO6-delta Peer-reviewed

T Sato, T Kamiyama, Y Naitoh, T Takahashi, Chong, I, T Terashima, M Takano

PHYSICAL REVIEW B　63　(13)　132502　2001/04

ISSN： 1098-0121

eISSN： 1550-235X
Crystal-field splitting in CeB6 observed by ultrahigh-resolution photoemission spectroscopy Peer-reviewed

S Souma, H Kumigashira, T Ito, T Sato, T Takahashi, S Kunii

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　114　729-734　2001/03

DOI： 10.1016/S0368-2048(00)00384-4 　

ISSN： 0368-2048
Para- to ferromagnetic phase transition of CoS2 studied by high-resolution photoemission spectroscopy Peer-reviewed

T Takahashi, Y Naitoh, T Sato, T Kamiyama, K Yamada, H Hiraka, Y Endoh, M Usuda, N Hamada

PHYSICAL REVIEW B　63　(9)　094415　2001/03

DOI： 10.1103/PhysRevB.63.094415 　

ISSN： 1098-0121

eISSN： 1550-235X
Observation of dx2-y2-like superconducting gap in an electron-doped high- temperature superconductor Peer-reviewed

T. Sato, T. Kamiyama, T. Takahashi, K. Kurahashi, K. Yamada

Science　291　(5508)　1517-1519　2001/02/23

DOI： 10.1126/science.1058021 　

ISSN： 0036-8075
Renormalization of spectral line shape and dispersion below T-c in Bi2Sr2CaCu2O8+delta Peer-reviewed

A Kaminski, M Randeria, JC Campuzano, MR Norman, H Fretwell, J Mesot, T Sato, T Takahashi, K Kadowaki

PHYSICAL REVIEW LETTERS　86　(6)　1070-1073　2001/02

DOI： 10.1103/PhysRevLett.86.1070 　

ISSN： 0031-9007
Two different types of pseudogaps in high-T-c superconductors Peer-reviewed

T Takahashi, T Sato, T Yokoya, T Kamiyama, Y Naitoh, T Mochiku, K Yamada, Y Endoh, K Kadowaki

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　62　(1-2)　41-45　2001/01

DOI： 10.1016/S0022-3697(00)00098-6 　

ISSN： 0022-3697
High-resolution angle-resolved photoemission study of Pb-substituted Bi2201 Peer-reviewed

T Sato, Y Naitoh, T Kamiyama, T Takahashi, T Yokoya, J Mesot, A Kaminski, H Fretwell, JC Campuzano, H Ding, Chong, I, T Terashima, M Takano, K Kadowaki

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　62　(1-2)　157-161　2001/01

DOI： 10.1016/S0022-3697(00)00119-0 　

ISSN： 0022-3697
The role of angle-resolved photoemission in understanding the high temperature superconductors Peer-reviewed

JC Campuzano, A Kaminski, H Fretwell, J Mesot, T Sato, T Takahashi, M Norman, M Randeria, K Kadowaki, D Hinks

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　62　(1-2)　35-39　2001/01

DOI： 10.1016/S0022-3697(00)00097-4 　

ISSN： 0022-3697
Determination of the Fermi surface in high-Tc superconductors by angle-resolved photoemission spectroscopy Peer-reviewed

J. Mesot, M. Randeria, M. R. Norman, A. Kaminski, H. M. Fretwell, J. C. Campuzano, H. Ding, T. Takeuchi, T. Sato, T. Yokoya, T. Takahashi, I. Chong, T. Terashima, M. Takano, T. Mochiku, K. Kadowaki

Physical Review B - Condensed Matter and Materials Physics　63　(22)　2245161-22451614　2001

DOI： 10.1103/PhysRevB.63.224516 　

ISSN： 0163-1829
Small and large pseudogaps in high-T-c superconductors observed by ultrahigh-resolution photoemission spectroscopy Peer-reviewed

T Sato, Y Naitoh, T Kamiyama, T Takahashi, T Yokoya, K Yamada, Y Endoh, K Kadowaki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　341　815-818　2000/11

DOI： 10.1016/S0921-4534(00)00702-4 　

ISSN： 0921-4534
Superconducting gap, pseudogap, and fermi surface of Bi2201: High energy- and momentum-resolution photoemission study Peer-reviewed

T Sato, Y Naitoh, T Kamiyama, T Takahashi, T Yokoya, J Mesot, A Kaminski, H Fretwell, JC Campuzano, H Ding, Chong, I, T Terashima, M Takano, K Kadowaki

PHYSICA C　341　2091-2094　2000/11

DOI： 10.1016/S0921-4534(00)01099-6 　

ISSN： 0921-4534
Pseudogap formation in Kondo insulators CeRhSb and CeRhAs studied by ultrahigh-resolution photoemission spectroscopy Peer-reviewed

H Kumigashira, T Sato, T Yokoya, T Takahashi, S Yoshii, M Kasaya

PHYSICA B　281　284-285　2000/06

DOI： 10.1016/S0921-4526(99)00827-3 　

ISSN： 0921-4526
Fermi surface of Bi2Sr2CaCu2O8 Peer-reviewed

HM Fretwell, A Kaminski, J Mesot, JC Campuzano, MR Norman, M Randeria, T Sato, R Gatt, T Takahashi, K Kadowaki

PHYSICAL REVIEW LETTERS　84　(19)　4449-4452　2000/05

DOI： 10.1103/PhysRevLett.84.4449 　

ISSN： 0031-9007
Quasiparticles in the superconducting state of Bi(2)Sr(2)CaCu(2)O(8+delta) Peer-reviewed

A Kaminski, J Mesot, H Fretwell, JC Campuzano, MR Norman, M Randeria, H Ding, T Sato, T Takahashi, T Mochiku, K Kadowaki, H Hoechst

PHYSICAL REVIEW LETTERS　84　(8)　1788-1791　2000/02

DOI： 10.1103/PhysRevLett.84.1788 　

ISSN： 0031-9007
Angle-resolved photoemission study of 1D chain and two-leg ladder Peer-reviewed

T Sato, T Yokoya, H Fujisawa, T Takahashi, M Uehara, T Nagata, J Akimitsu, S Miyasaka, M Kibune, H Takagi

STRIPES AND RELATED PHENOMENA　263-270　2000
BSCCO Superconductors: Hole-like Fermi surface and doping dependence of the gap Peer-reviewed

J. Mesot, M. R. Norman, H. Ding, H. Randeria, J. C. Campuzano, A. Paramekanti, H. Fretwell, A. Kaminski, T. Yokoya, T. Sato, T. Takahashi, T. Mochiku, K. Kadowaki

J. Low Temp. Phys.　117　(3-4)　365-370　1999/12

DOI： 10.1023/A:1022569616840 　

ISSN： 0022-2291
Changes in superconducting gap anisotropy with doping and implications for the penetration depth Peer-reviewed

J Mesot, MR Norman, HM Fretwell, A Kaminski, JC Campuzano, H Ding, M Randeria, A Paramekanti, T Takeuchi, T Mochiku, T Yokoya, T Sato, T Takahashi, K Kadowaki

INTERNATIONAL JOURNAL OF MODERN PHYSICS B　13　(29-31)　3709-3711　1999/12

DOI： 10.1142/S0217979299003726 　

ISSN： 0217-9792
Electronic spectra and their relation to the (pi,pi) collective mode in high-T(c) superconductors Peer-reviewed

JC Campuzano, H Ding, MR Norman, HM Fretwell, M Randeria, A Kaminski, J Mesot, T Takeuchi, T Sato, T Yokoya, T Takahashi, T Mochiku, K Kadowaki, P Guptasarma, DG Hinks, Z Konstantinovic, ZZ Li, H Raffy

PHYSICAL REVIEW LETTERS　83　(18)　3709-3712　1999/11

DOI： 10.1103/PhysRevLett.83.3709 　

ISSN： 0031-9007
Superconducting gap anisotropy and quasiparticle interactions: A doping dependent photoemission study Peer-reviewed

J Mesot, MR Norman, H Ding, M Randeria, JC Campuzano, A Paramekanti, HM Fretwell, A Kaminski, T Takeuchi, T Yokoya, T Sato, T Takahashi, T Mochiku, K Kadowaki

PHYSICAL REVIEW LETTERS　83　(4)　840-843　1999/07

DOI： 10.1103/PhysRevLett.83.840 　

ISSN： 0031-9007

eISSN： 1079-7114
Spectral evidence for pseudogap formation in kondo insulators CeRhAs and CeRhSb Peer-reviewed

H. Kumigashira, T. Sato, T. Yokoya, T. Takahashi, S. Yoshii, M. Kasaya

Physical Review Letters　82　(9)　1943-1946　1999/01/01

DOI： 10.1103/PhysRevLett.82.1943 　

ISSN： 1079-7114 0031-9007
Electronic structure of Ce1-xSrxTiO3: Comparison between substitutional and vacancy doping Peer-reviewed

T Yokoya, T Sato, H Fujisawa, T Takahashi, A Chainani, M Onoda

PHYSICAL REVIEW B　59　(3)　1815-1818　1999/01

DOI： 10.1103/PhysRevB.59.1815 　

ISSN： 1098-0121

eISSN： 1550-235X
Spectral evidence for pseudogap formation in Kondo insulators CeRhSb and CeRhAs Peer-reviewed

SATO Takafumi

Physical Review Letter　83　(9)　840　1999
Ultrahigh-resdution photoemission study of Kondo insulators CeRhAs and CeRhSb Peer-reviewed

SATO Takafumi

Japanese Journal of Applied Physics　22　91-93　1999
Publisher: Japanese Journal of Applied Physics
Construction of high-resolution photoemission spectromter and study of the electronic structure in the vicinity of Fermi level of high-Temperature superconductors Peer-reviewed

SATO Takafumi

物性研究　72　(5)　689　1999
Pseudogap of optimally doped La1.85Sr0.15CuO4 observed by ultrahigh-resolution photoemission spectroscopy Peer-reviewed

T. Sato, T. Yokoya, Y. Naitoh, T. Takahashi, K. Yamada, Y. Endoh

Physical Review Letters　83　(11)　2254-2257　1999/01/01

DOI： 10.1103/PhysRevLett.83.2254 　

ISSN： 1079-7114 0031-9007
Angle-resolved photoemission study of superconducting ladder compound Sr14-xCaxCu24O41 Peer-reviewed

T. Sato, T. Yokoya, T. Takahashi, M. Uehara, T. Nagata, J. Goto, J. Akimitsu

Journal of Physics and Chemistry of Solids　59　(10-12)　1912-1916　1998
Publisher: Elsevier Ltd
DOI： 10.1016/S0022-3697(98)00148-6 　

ISSN： 0022-3697

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Misc. 402

Novel surface states of a kagome superconductor LaRh₃B₂ studied by ARPES

加藤剛臣, 中山耕輔, 大隅拓海, 相馬清吾, 相馬清吾, 本間飛鳥, ANTEZAK Alexandre, 田中清尚, 田中清尚, 北村未歩, 小澤健一, 堀場弘司, 組頭広志, 高橋隆, FORTUNA Franck, SANTANDER-SYRO Andres Felipe, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

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Electronic structure of Cr-substituted kagome superconductor Cs(V_1-xCr_x)₃Sb₅ observed by micro-ARPES

鈴木崇人, 加藤剛臣, 中山耕輔, LI Yongkai, WANG Zhiwei, 相馬清吾, 相馬清吾, 小澤健一, 北村未歩, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

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Imaging the electronic structure of Te(0001) using micro-ARPES

中山耕輔, 徳山敦也, 山内邦彦, 守谷歩美, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 北村未歩, 北村未歩, 堀場弘司, 組頭広志, 小口多美夫, 高橋隆, 瀬川耕司, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　79　(1)　2024

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Electronic structure of Laves phase compound CsBi₂ studied by high-resolution ARPES

森田雄晴, 加藤剛臣, 中山耕輔, LI Yongkai, WANG Zhiwei, 相馬清吾, 相馬清吾, 田中清尚, 田中清尚, 小澤健一, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

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Electronic states of Cs thin films grown on the kagome metal CsV₃Sb₅ studied by high-resolution ARPES

加藤剛臣, 中山耕輔, LI Yongkai, WANG Zhiwei, 菅原克明, 菅原克明, 菅原克明, 田中清尚, 田中清尚, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

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ISSN： 2189-079X
High-resolution ARPES study of Weyl semimetal PtBi₂

森田雄晴, 中山耕輔, 加藤剛臣, 相馬清吾, 相馬清吾, 眞崎世聞, 生島匠, 守安悠人, 萩原健太, 松井文彦, 松井文彦, 田中清尚, 田中清尚, 小澤健一, 志賀大亮, 組頭広志, 高橋隆, 工藤一貴, 工藤一貴, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　79　(2)　2024

ISSN： 2189-079X
Observation of edge states derived from topological helix chains: micro-ARPES

中山耕輔, 徳山敦也, 山内邦彦, 守谷歩美, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 北村未歩, 北村未歩, 堀場弘司, 組頭広志, 小口多美夫, 高橋隆, 瀬川耕司, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　79　(2)　2024

ISSN： 2189-079X
Chemical Substitution Effects on Kagome Superconductors Studied by Angle-Resolved Photoemission Spectroscopy

加藤剛臣, 中山耕輔, 佐藤宇史, 佐藤宇史

Photon Factory News　41　(4)　2024

ISSN： 0916-0604
Polar Surface of a Novel Kagome Superconductor Revealed by Angle-resolved Photoemission Spectroscopy

中山耕輔, 加藤剛臣, 佐藤宇史

表面と真空　66　(1)　2023

ISSN： 2433-5835
ARPES study of a topological insulator candidate CdGeAs₂

岩谷拓実, 守谷歩美, 中山耕輔, 中山耕輔, 本間飛鳥, 加藤剛臣, 川上竜平, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 田中清尚, 北村未歩, 堀場弘司, 堀場弘司, 組頭広志, 高橋隆, 瀬川耕司, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　78　(1)　2023

ISSN： 2189-079X
Electronic states of kagome superconductors AV₃Sb₅ (A=K, Rb, Cs) studied by micro-ARPES

加藤剛臣, 中山耕輔, 中山耕輔, LI Yongkai, LIU Min, WANG Zhiwei, 相馬清吾, 相馬清吾, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　78　(1)　2023

ISSN： 2189-079X
High-resolution ARPES study of carrier-controlled chalcopyrite CdGeAs₂

岩谷拓実, 守谷歩美, 中山耕輔, 本間飛鳥, 加藤剛臣, 川上竜平, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 田中清尚, 北村未歩, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 瀬川耕司, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　78　(2)　2023

ISSN： 2189-079X
Micro-ARPES study of kagome-lattice material LaRh₃B₂

大隅拓海, 加藤剛臣, 本間飛鳥, 中山耕輔, 相馬清吾, 相馬清吾, 田中清尚, 北村未歩, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　78　(2)　2023

ISSN： 2189-079X
Micro-ARPES study of Cr-substituted kagome superconductor CsV₃Sb₅

鈴木崇人, 加藤剛臣, 中山耕輔, LI Yongkai, WANG Zhiwei, 相馬清吾, 相馬清吾, 北村未歩, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　78　(2)　2023

ISSN： 2189-079X
Quantum well states of alkaline metals studied by high-resolution ARPES

中山耕輔, 加藤剛臣, LI Yongkai, WANG Zhiwei, 菅原克明, 菅原克明, 菅原克明, 田中清尚, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　78　(2)　2023

ISSN： 2189-079X
カゴメ超伝導体CsV₃Sb₅のCDW転移:μ-ARPES

加藤剛臣, 中山耕輔, 中山耕輔, LI Yongkai, 相馬清吾, 相馬清吾, LIU Min, WANG Zhiwei, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本放射光学会年会・放射光科学合同シンポジウム(Web)　35th　2022
原子層VS₂の電子状態:マイクロARPES

川上竜平, 加藤剛臣, 猿田康朗, 中山耕輔, 中山耕輔, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本放射光学会年会・放射光科学合同シンポジウム(Web)　35th　2022
High-resolution ARPES study of Bismuthene on H-SiC

八重樫健, 川上竜平, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(1)　2022

ISSN： 2189-079X
High-resolution ARPES study of a kagome superconductor KV₃Sb₅

加藤剛臣, 川上竜平, 守谷歩美, 中山耕輔, 中山耕輔, LI Yongkai, LIU Min, WANG Zhiwei, 田中清尚, 田中清尚, 高橋隆, 高橋隆, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(1)　2022

ISSN： 2189-079X
Anomalous electronic states of atomic-layer MoTe₂ thin film studied by micro ARPES

菅原克明, 菅原克明, 菅原克明, 菅原克明, 猿田康朗, 岡博文, 川上竜平, 加藤剛臣, 中山耕輔, 中山耕輔, 相馬清吾, 相馬清吾, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 福村知昭, 福村知昭, 福村知昭, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(1)　2022

ISSN： 2189-079X
Charge-density-wave phase of atomic-layer VS₂ thin films studied by μ-ARPES

川上竜平, 岡博文, 加藤剛臣, 猿田康朗, 中山耕輔, 中山耕輔, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 福村知昭, 福村知昭, 福村知昭, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(1)　2022

ISSN： 2189-079X
ARPES study of a topological insulator candidate with chalcopyrite structure

岩谷拓実, 守谷歩美, 中山耕輔, 中山耕輔, 加藤剛臣, 相馬清吾, 相馬清吾, 北村未歩, 堀場弘司, 堀場弘司, 組頭広志, 高橋隆, 瀬川耕司, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(2)　2022

ISSN： 2189-079X
ARPES study of Bi surface prepared by GCIB

守谷歩美, 中山耕輔, 中山耕輔, 徳山敦也, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(2)　2022

ISSN： 2189-079X
Domain-selective micro-ARPES study of a kagome superconductor CsV₃Sb₅

加藤剛臣, 中山耕輔, 中山耕輔, LI Yongkai, WANG Zhiwei, 相馬清吾, 相馬清吾, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(2)　2022

ISSN： 2189-079X
Electronic states of α-Bi and bismuthine on H-SiC: high-resolution ARPES

八重樫健, 川上竜平, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(2)　2022

ISSN： 2189-079X
Nb substitution effect on a kagome superconductor CsV₃Sb₅ studied by high-resolution ARPES

加藤剛臣, 中山耕輔, 中山耕輔, LI Yongkai, WANG Zhiwei, 相馬清吾, 相馬清吾, 松井文彦, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(2)　2022

ISSN： 2189-079X
Anisotropic CDW gap in a kagome superconductor KV₃Sb₅ studied by angle-resolved photoemission spectroscopy

加藤剛臣, 川上竜平, 守谷歩美, 中山耕輔, 中山耕輔, LI Yongkai, LIU Min, WANG Zhiwei, 田中清尚, 田中清尚, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　77　(2)　2022

ISSN： 2189-079X
Electronic states of atomic-layer MoTe₂ thin film studied by Micro-ARPES

菅原克明, 菅原克明, 菅原克明, 猿田康朗, 岡博文, 川上竜平, 加藤剛臣, 中山耕輔, 中山耕輔, 相馬清吾, 相馬清吾, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 福村知昭, 福村知昭, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　83rd　2022

ISSN： 2758-4704
VTe₂薄膜の高分解能ARPES

川上竜平, 田口大樹, 加藤剛臣, 猿田康朗, 菅原克明, 高橋隆, 佐藤宇史, 菅原克明, 高橋隆, 佐藤宇史, 菅原克明, 高橋隆, 佐藤宇史

日本放射光学会年会・放射光科学合同シンポジウム(Web)　34th　2021
Micro-ARPES study of the electronic structure in novel Dirac semimetals

中山耕輔, 中山耕輔, 久保田雄也, 高根大地, 相馬清吾, 相馬清吾, 本間飛鳥, 川上竜平, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 瀬川耕司, 出田真一郎, 出田真一郎, 田中清尚, 田中清尚, 北村未歩, 堀場弘司, 堀場弘司, 組頭広志, 組頭広志, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(1)　2021

ISSN： 2189-079X
Transition-metal dichalcogenide films studied by micro-ARPES

菅原克明, 菅原克明, 菅原克明, 菅原克明, 川上竜平, 加藤剛臣, 田口大樹, 猿田康朗, 久保田雄也, 坪野竜治, 北村未歩, 堀場弘司, 組頭広志, 組頭広志, 上野啓司, 中山耕輔, 中山耕輔, 中山耕輔, 中山耕輔, 相馬清吾, 相馬清吾, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(1)　2021

ISSN： 2189-079X
High-resolution ARPES study of Dirac semimetal candidate BaMg₂Bi₂

高根大地, 久保田雄也, 川上竜平, 加藤剛臣, 坪野竜治, 菅原克明, 菅原克明, 中山耕輔, 中山耕輔, 相馬清吾, 相馬清吾, 出田真一郎, 田中清尚, 田中清尚, 北村未歩, 堀場弘司, 堀場弘司, 組頭広志, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 瀬川耕司, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(1)　2021

ISSN： 2189-079X
Quasi-one-dimensional Fermi surface and charge-density-wave phase of multilayer VTe₂ thin films studied by high-resolution ARPES

川上竜平, 加藤剛臣, 田口大樹, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(1)　2021

ISSN： 2189-079X
Fine electronic structure of the atomic layer MoTe₂ thin films: High-resolution ARPES

猿田康朗, 加藤剛臣, 川上竜平, 田口大樹, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(1)　2021

ISSN： 2189-079X
Electronic states of atomic-layer VS₂ studied by μ-ARPES

川上竜平, 加藤剛臣, 猿田康朗, 中山耕輔, 中山耕輔, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
Micro-ARPES study of atomic-layer 1T’/1H-MoTe₂ thin films

猿田康朗, 加藤剛臣, 川上竜平, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
High-resolution ARPES study of atomic-layer Bi film on hydrogen-terminated SiC

八重樫健, 川上竜平, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
Anomalous electronic states in atomic-layer NbTe₂ studied by high-resolution ARPES

菅原克明, 菅原克明, 菅原克明, 菅原克明, 田口大樹, 岡博文, 川上竜平, 猿田康朗, 加藤剛臣, 中山耕輔, 中山耕輔, 相馬清吾, 相馬清吾, 高橋隆, 高橋隆, 高橋隆, 福村知昭, 福村知昭, 福村知昭, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
Micro-ARPES study of a new kagome superconductor CsV₃Sb₅

加藤剛臣, 中山耕輔, 中山耕輔, LI Yongkai, 相馬清吾, 相馬清吾, LIU Min, WANG Zhiwei, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
High-resolution ARPES study of a new kagome superconductor CsV₃Sb₅

中山耕輔, 中山耕輔, LI Yongkai, 加藤剛臣, LIU Min, WANG Zhiwei, 高橋隆, 高橋隆, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
Carrier injection and manipulation of charge-density wave in a kagome superconductor CsV₃Sb₅

中山耕輔, 中山耕輔, LI Yongkai, 加藤剛臣, LIU Min, WANG Zhiwei, 高橋隆, 高橋隆, 高橋隆, YAO Yugui, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
ファンデルワールス強磁性体Cr₂Ge₂Te₆の高分解能ARPES

加藤剛臣, 伊東直洋, 川上竜平, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 中山耕輔, 高橋隆, 高橋隆, 高橋隆, 塩見雄毅, 齊藤英治, 齊藤英治, 齊藤英治, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本放射光学会年会・放射光科学合同シンポジウム(Web)　34th　2021
Dirac gap in Bi₂Se₃/Cr₂Ge₂Te₆ studied by high-resolution ARPES

加藤剛臣, 伊東直洋, 川上竜平, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 中山耕輔, 中山耕輔, 北村未歩, 堀場弘司, 堀場弘司, 組頭広志, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 塩見雄毅, 齊藤英治, 齊藤英治, 齊藤英治, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　76　(1)　2021

ISSN： 2189-079X
NbTe₂単原子層薄膜の高分解能ARPES

田口大樹, 中田優樹, 川上竜平, 加藤剛臣, 佐藤匠, 菅原克明, 菅原克明, 菅原克明, 中山耕輔, 相馬清吾, 相馬清吾, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本放射光学会年会・放射光科学合同シンポジウム(Web)　33rd　2020
High-resolution ARPES study of atomic layer TiSe_2-x thin film

菅原克明, 菅原克明, 菅原克明, 中田優樹, 川上竜平, 佐藤匠, 田口大樹, 加藤剛臣, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(1)　2020

ISSN： 2189-079X
High-resolution ARPES study of NbTe₂ atomic layer thin film

田口大樹, 中田優樹, 川上竜平, 佐藤匠, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(1)　2020

ISSN： 2189-079X
High-resolution ARPES study of monolayer and multilayer VTe₂ thin films

川上竜平, 中田優樹, 佐藤匠, 田口大樹, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(1)　2020

ISSN： 2189-079X
Quasi-one-dimensional electronic states of multilayer VTe₂ thin films studied by high-resolution ARPES

川上竜平, 田口大樹, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(2)　2020

ISSN： 2189-079X
Electronic states of mono- and multi-layer NbTe₂ films studied by ARPES

田口大樹, 川上竜平, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(2)　2020

ISSN： 2189-079X
High-resolution ARPES study of the atomic layer MoTe₂ thin films

猿田康朗, 加藤剛臣, 川上竜平, 田口大樹, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(2)　2020

ISSN： 2189-079X
Scanning tunneling spectroscopy on Pb thin films on topological insulator Bi₂Se₃

町田理, 町田理, 菅原克明, 菅原克明, 菅原克明, 幸坂祐生, 佐藤宇史, 佐藤宇史, 佐藤宇史, 笹川崇男, 花栗哲郎

日本物理学会講演概要集(CD-ROM)　75　(2)　2020

ISSN： 2189-079X
Ferromagnetic transition of van der Waals ferromagnet Cr₂Ge₂Te₆ studied by high-resolution ARPES

加藤剛臣, 伊東直洋, 川上竜平, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 中山耕輔, 高橋隆, 高橋隆, 高橋隆, 塩見雄毅, 齊藤英治, 齊藤英治, 齊藤英治, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(1)　2020

ISSN： 2189-079X
Dirac electronic states of topological insulator/ferromagnet heterostructures studied by high-resolution ARPES

加藤剛臣, 伊東直洋, 川上竜平, 久保田雄也, 田口大樹, 坪野竜治, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 中山耕輔, 高橋隆, 高橋隆, 高橋隆, 塩見雄毅, 齊藤英治, 齊藤英治, 齊藤英治, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(2)　2020

ISSN： 2189-079X
鉄カルコゲナイド高温超伝導体の高分解能ARPES

坪野竜治, 中山耕輔, 中山耕輔, 大和田健太, 鍋島冬樹, 色摩直樹, 石川智也, 崎下雄稀, 前田京剛, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本放射光学会年会・放射光科学合同シンポジウム(Web)　33rd　2020
ARPES study of electronic states in Fe(Se,Te)/CaF₂

中山耕輔, 中山耕輔, 坪野竜治, 大和田健太, 鍋島冬樹, 色摩直樹, 石川智也, 崎下雄稀, 前田京剛, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(1)　2020

ISSN： 2189-079X
High-resolution ARPES study of high-temperature superconducting Fe(Se, Te)/CaF₂ thin films

中山耕輔, 中山耕輔, 坪野竜治, 大和田健太, 鍋島冬樹, 色摩直樹, 石川智也, 崎下雄稀, 前田京剛, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　75　(2)　2020

ISSN： 2189-079X
単層VTe₂薄膜の電子構造:高分解能ARPES

川上竜平, 中田優樹, 佐藤匠, 田口大樹, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　74　(2)　2019

ISSN： 2189-079X
NbTe₂原子層薄膜の電子状態:高分解能ARPES

田口大樹, 中田優樹, 川上竜平, 佐藤匠, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　74　(2)　2019

ISSN： 2189-079X
トポロジカル絶縁体積層構造Fe_x(Bi_1-ySb_y)_2-xSe₃/Bi₂Se₃の磁場誘起量子異常ホール効果

佐竹遥介, 塩貝純一, 木村尚次郎, 淡路智, 藤原宏平, 野島勉, 相馬清吾, 佐藤宇史, 塚崎敦

日本物理学会講演概要集(CD-ROM)　74　(1)　2019

ISSN： 2189-079X
トポロジカル絶縁体/ファンデルワールス強磁性体ハイブリッドの高分解能ARPES

加藤剛臣, 伊東直洋, 佐藤匠, 中田優樹, 菅原克明, 菅原克明, 菅原克明, 相馬清吾, 相馬清吾, 中山耕輔, 高橋隆, 高橋隆, 高橋隆, 塩見雄毅, 齊藤英治, 齊藤英治, 齊藤英治, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　74　(2)　2019

ISSN： 2189-079X
Fe(Te,Se)/CaF₂高温超伝導体の高分解能ARPES

坪野竜治, 中山耕輔, 中山耕輔, 大和田健太, 鍋島冬樹, 色摩直樹, 石川智也, 崎下雄稀, 前田京剛, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

日本物理学会講演概要集(CD-ROM)　74　(2)　2019

ISSN： 2189-079X
Superconducting gap of FeSe_1-xTe_x thin films studied by ARPES

PHAN G. N., SHIGEKAWA K., KUNO M., NAKAYAMA K., NABESHIMA F., KAWAI M., IMAI Y., MAEDA A., TAKAHASHI T., SATO T.

日本物理学会講演概要集(CD-ROM)　73　(1)　2018

ISSN： 2189-079X
物理科学この一年：トポロジカル絶縁体・半金属の創成

佐藤宇史

パリティ　1　34-36　2018/01
High-resolution ARPES study of FeSe_1-xTe_x thin films

PHAN G., SHIGEKAWA K., KUNO M., NAKAYAMA K., NABESHIMA F., KAWAI M., IMAI Y., MAEDA A., SATO T., TAKAHASHI T.

日本物理学会講演概要集(CD-ROM)　72　(2)　2017

ISSN： 2189-079X
トポロジカル絶縁体／金属接合における近接効果

佐藤宇史, 小口多美夫, 高橋隆, 安藤陽一

応用物理　85　(5)　471-421　2016/05/01
Publisher: 応用物理学会
ISSN： 0369-8009
FeSe 原子層薄膜の高温超伝導

中山耕輔, 佐藤宇史, 高橋隆

日本物理学会誌　71　(2)　99-103　2016/02/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 0029-0181

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We report angle-resolved photoemission spectroscopy (ARPES) study on atomic-layer FeSe films grown on SrTiO_3 substrate. We observed that a monolayer film shows superconductivity with the onset temperature of 60 K. We also found that potassium (K) deposition onto the film enables the systematic control of carrier concentration. By using this method, we have succeeded in converting non-superconducting as-grown multilayer films into a high-temperature superconductor. We have established the electronic phase diagram of FeSe film and revealed an important role of interface for realizing the high-temperature superconductivity.
10aAH-6 High-resolution ARPES study of hydrogen-adsobed graphene

Suzuki K., Noguchi E., Kleeman James, Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　626-626　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
10pAS-1 Topological proximity effect in Bi/TlBiSe_2 studied by high-resolution ARPES

Shoman T., Takayama A., Sato T., Souma S., Takahashi T., Oguchi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　69　(2)　677-677　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
7aAX-9 Electronic states of superconducting Tl_5Te_3 studied by high-resolution ARPES

Tanaka Y., Shoman T., Nakayama K., Souma S., Takahashi T., Toba T., Sasaki S., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　69　(2)　466-466　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
7aAS-6 Direct observation of two-dimensional electron gas at the surface of In_4Se_3 by high-resolution angle-resolved photoemission spectroscopy

Fukutani K., Miyata Y., Ieki E., Matsuzaki I., Galiy P. V., Dowben P. A., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　632-632　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
9pAJ-8 High-resolution ARPES study of a topological-superconductor candidate Cu_x(PbSe)_5(Bi_2Se_3)_<3m>

Kimizuka H., Shouman T., Tanaka Y., Nakayama K., Souma S., Sato T., Takahashi T., Eto K., Sasaki S., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　69　(2)　531-531　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
9pAJ-5 High-resolution ARPES study of Co/W(110)

Goto T., Honma K., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　530-530　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
9pAJ-6 Atom-absorption effect of quantized states on Ag/Si(111) studied by high-resolution ARPES

Noguchi E., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　531-531　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
9pAJ-7 Electronic Structure of Ultrathin Intercalation Compound C_8Cs

Kleeman James, Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　531-531　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
9pBD-8 High-resolution ARPES study of FeSe single crystal

Nakayama K., Miyata Y., Phan Giao, Sato T., Tanabe Y., Urata T., Tanigaki K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　436-436　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
9pBD-11 ARPES study of single- and multi-layer FeSe thin films

Miyata Y., Phan Giao, Nakayama K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　437-437　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
9pBD-9 Strain effects on the electronic structure of FeSe

Phan Giao, Miyata Yasunari, Nakayama Kosuke, Sugawara Katsuaki, Sato Takafumi, Takahashi Takashi, Tanabe Youichi, Urata Takahiro, Tanigaki Katsumi, Nabeshima Fuyuki, Imai Yoshinori, Maeda Atsutaka

Meeting abstracts of the Physical Society of Japan　69　(2)　436-436　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
10pAS-1 Topological proximity effect in Bi/TlBiSe_2 studied by high-resolution ARPES

Shoman T., Takayama A., Sato T., Souma S., Takahashi T., Oguchi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　69　(2)　461-461　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
8aBF-4 High-resolution ARPES study of ultrathin Fe film

Honma K., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(2)　287-287　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aCE-5 Electronic structure of FeSe thin film studied by high-resolution ARPES

Nakayama K., Miyata Y., Ieki E., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　586-586　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29pAQ-1 High-resolution ARPES study of oxygen-adsorbed Fe/VU(110) surface

Honma K., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　898-898　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pCL-1 Anisotropic electron-phonon coupling in Rb-intercalated bilayer graphene

Kleeman J., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　710-710　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aBF-10 Electronic structure of topological crystalline insulator SnTe on two different surfaces

Tanaka Y., Shoman T., Nakayama K., Souma S., Sato Y., Takahashi T., Novak M., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　69　(1)　707-707　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aBF-9 Electronic states of Bi-deposited TlBiSe2 studied by High-resolution ARPES

Shoman T., Takayama A., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T., Eto K., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　69　(1)　706-706　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aAS-8 High-resolution ARPES study of FeSe/SrTiO_3

Miyata Y., Ieki E., Nakayama K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　743-743　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aAS-9 High-resolution ARPES of FeSe film

Phan Giao, Miyata Yasunari, Ieki Ei, Nakayama Kosuke, Sato Takafumi, Takahashi Takashi, Nabeshima Fuyuki, Imai Yoshinori, Maeda Atsutaka

Meeting abstracts of the Physical Society of Japan　69　(1)　743-743　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aAS-7 High-Resolution ARPES study of Quasi-One-Dimensional Semiconductor In_4Se_3

Fukutani K., Miyata Y., Ieki E., Matsuzaki I., Galiy P.V., Dowben P.A., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　742-742　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pAQ-3 Edge state of Bi thin film studied by spin-resolved ARPES

Takayama A., Sato T., Souma S., Oguchi T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　873-873　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aAQ-6 Layer dependence of electronic structure of graphene on H-terminated SiC studied by high-resolution ARPES

Sugawara K., Takahashi T., Kleeman James, Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　878-878　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pAQ-4 High-resolution ARPES study of K-deposited Ag thin film

Noguchi E., Takahashi Toru, Kleeman James, Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　69　(1)　874-874　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
ARPES study of graphene intercalation compounds

Sugawara K., Kanetani K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　797-797　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of Se-rich FeTe_<1-x>Se_x

Ieki E., Miyata Y., Nakayama K., Sato T., Miao H., Qian T., Richard P., Wen H.H., Gu G.D., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　494-494　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of electron-doped LiFeAs

Miyata Y., Wang X.-P., Ieki E., Nakayama K., Sato T., Miao H., Richard P., Ding H., Li Y., Liuc Z.-H., Wang S.-C., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　494-494　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of NaFeAs-based superconductor

Nakayama K., Miyata Y., Ieki E., Sato T., Qian T., Richard P., Ding H., Liuc Z.-H., Wang S.-C., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　494-494　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Anomalous electronic structure of Bi/Si(111) surface studied by high-resolution ARPES

Takayama A., Sato T., Souma S., Oguchi T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　786-786　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Band-gap tuning of oxygen-adsorbed graphene : High-resolution ARPES

Takahashi Toru, Noguchi E., Kleeman J., Sato T., Sugawara K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　782-782　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Warping effect of Fermi surface in topological insulators studied by high-resolution ARPES

Nomura M., Souma S., Eto K., Nakayama K., Sato T., Takahashi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　68　(2)　786-786　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic structure of metal-atom-deposited TlBiSe_2 : High-resolution ARPES

Shoman T., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T., Eto K., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　68　(2)　786-786　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of topological crystalline insulator(Pb, Sn)Te

Tanaka Y., Ren Z., Sato T., Nakayama K., Souma S., Takahashi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　68　(2)　605-605　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of Sn_<1-x>In_xTe, candidate of topological superconductor

SatoA T., TanakaA Y., Nakayama K., Souma S., Takahashi T., Sasaki S., Ren Z., Taskin A.A., Segawac K., Ando Y.

Meeting abstracts of the Physical Society of Japan　68　(2)　605-605　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of Fe/W(110)

Honma K., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　701-701　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pDB-8 Electron-Phonon Coupling in Alkali-Doped Bilayer Graphene Studied by ARPES

Kleeman J., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　701-701　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of oxygen-adsorbed monolayer graphene

Noguchi E., Takahashi Toru, Kleeman James, Sato T., Sugawara K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　701-701　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pKD-12 Electronic structure of 1T-TaS_<2-x>Se_x studied by ARPES

Ang R., Miyata Y., Ieki E., Nakayama K., Sato T., Sugawara K., Liuc Y., Luc J.W., Sun P.Y., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(2)　579-579　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aXJ-13 Electronic structure of 1T-TaS_2 system studied by ARPES

Ang R., Ieki E., Tanaka Y., Nakayama K., Sato T., Liu Y., Lu W. J., Sun Y. P., Takanashi T.

Meeting abstracts of the Physical Society of Japan　68　(1)　691-691　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aXG-11 High-resolution ARPES study of FeTe_<1-x>Se_x

Ieki E., Miyata Y., Tanaka Y., Nakayama K., Sato T., Miao H., Qian T., Richard P., Wen H. H., Gu G. D., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(1)　575-575　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aEJ-1 High-resolution ARPES study of Co-doped LiFeAs

Miyata Y., Wang X.-P., Ieki E., Nakayama K., Sato T., Richard P., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(1)　853-853　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aEJ-9 High-resolution ARPES study of W(110) surface

Honma K., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(1)　855-855　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aEJ-8 Band-gap tuning of mono-layer graphene on SiC studied by high-resolution ARPES

Noguchi E., Takahashi Toru, Kleeman James, Sato T., Sugawara K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(1)　855-855　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aEJ-7 High-resolution ARPES study of metal-atom-adsorped topological-insulator surface

Shoman T., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T., Eto K., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　68　(1)　855-855　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aXP-4 High-resolution ARPES study of oxygen-adsorbed graphene

Takahashi Toru, Noguchi E., Kleeman James, Sato T., Sugawara K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(1)　960-960　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aXP-2 ARPES study of alkali-doped bilayer graphene

Kleeman James, Takahashi Toru, Sugawara Katsuaki, Sato Takafumi, Takahashi Takashi

Meeting abstracts of the Physical Society of Japan　68　(1)　960-960　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aXP-1 Electronic structure of intercalated bilayer graphene C_6AC_6(A=Li,Ca)

Sugawara K., Kanetani K., Sato T., Shimizu R., Iwaya K., Hitosugi T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　68　(1)　960-960　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pXG-5 Manipulation of Dirac-cone states with bulk heterostructure in topological insulators

Nakayama K., Eto K., Tanaka Y., Sato T., Souma S., Takahashi T., Segawa Kouji, Ando Yoichi

Meeting abstracts of the Physical Society of Japan　68　(1)　769-769　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pXG-1 Electronic structure of novel topological materials studied by ARPES

Sato Takafumi

Meeting abstracts of the Physical Society of Japan　68　(1)　768-768　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pXG-3 Warping effect of Pb-based topological insulator studied by spin-resolved ARPES

Nomura M., Souma S., Eto K., Nakayama K., Sato T., Takahashi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　68　(1)　768-768　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pXG-4 High-resolution ARPES study of topological crystalline insulator SnTe

Tanaka Y., Ren Zhi, Sato T., Nakayama K., Souma S., Takahashi T., Segawa Kouji, Ando Yoichi

Meeting abstracts of the Physical Society of Japan　68　(1)　769-769　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
18pFE-6 High-resolution spin-resolved ARPES study of Sb thin film

Takayama A., Sato T., Souma S., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(2)　815-815　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aFJ-10 High-resolution ARPES study of multi-layer graphene on H-terminated SiC

Takahashi Toru, Sugawara K., Kleeman James, Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(2)　698-698　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aFJ-5 High-resolution ARPES study of new Co-based superconductor LaCo_2B_2

Ieki E., Nakayama K., Tanaka Y., Sato T., Takahashi T., Kuroda T., Mizoguchi H., Kim S. W., Hosono H.

Meeting abstracts of the Physical Society of Japan　67　(2)　697-697　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aFJ-9 High-resolution ARPES study of C8AC8(A=K,Rb)

Kleeman James

Meeting abstracts of the Physical Society of Japan　67　(2)　698-698　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aFJ-11 Electronic structure of Fe-doped 1T-TaS_2 studied by ARPES

Ang R., Tanaka Y., Ieki E., Nakayama K., Sato T., Li L. J., Sun Y. P., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(2)　698-698　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aFJ-12 Spin-dependent electronic states near the quantum phase transition of a Tl-based topological insulator

Sato T., Souma S., Komatsu M., Nomura M., Takayama A., Takahashi T., Eto K., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　67　(2)　698-698　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aFJ-13 Adsorbate-induced carrier-doping to surface states in topological insulator

Komatsu M., Arakane T., Sato T., Souma S., Kosaka K., Nakayama K., Takahashi T., Ren Zhi, Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　67　(2)　699-699　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19aEC-4 High-resolution ARPES studies of mono-/multi-layer graphene on H-terminated SIC

Sugawara K., Takahashi T., Kleeman James, Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(2)　768-768　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aEA-9 Spin-resolved ARPES study of TlBi(S, Se)_2

Souma S., Komatsu M., Nomura M., Sato T., Takayama A., Takahashi T., Eto K., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　67　(2)　632-632　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aEA-8 Spin-resolved ARPES of topologcial insulator Pb(Bi_<1-x>Sb_x)_2Te_4

Nomura M., Souma S., Eto K., Nakayama K., Sato T., Takahashi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　67　(2)　631-631　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aGA-10 Composition dependence of electronic structure in FeTe_<1-x>Se_x studied by high-resolution ARPES

Ieki E., Tanaka Y., Nakayama K., Sato T., Miao H., Qian T., Richard P., Ding H., Wen H. -H., Gu G. D., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(2)　502-502　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aGA-1 High-resolution ARPES study of superconducting gap in overdoped Ba_<1-x>K_xFe_2As_2

Nakayama K., Ieki E., Sato T., Miao H., Qian T., Richard P., Xu X. -M., Neupane M., Chen G. F., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(2)　500-500　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pCK-3 Film-thickness dependence of spin polarization of surface electronic states in Bi/Si(111) thin film

Takayama A., Sato T., Souma S., Oguchi T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(1)　939-939　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pSB-7 Layer dependence of electronic structure of graphene on H-terminated SiC : High-resolution ARPES study

Sugawara K., Takahashi T., Kanetani K., Kleeman James, Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(1)　915-915　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pAC-7 High-tesolution ARPES study of graphene on H-temiinated SiC

Takahashi Toru, Sugawara K., Kanatani K., Kleeman James, Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(1)　804-804　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pAC-8 Electronic structure of Rb-doped bilayer graphene studied by ARPES

Kleeman J., Kanetani K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(1)　804-804　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pBD-4 High-resolution ARPES study of Cu_xBi_2Se_3 : doping dependence of electronic sucture

Tanaka Y., Nakayama K., Souma S., Sato T., Xu N., Zhang P., Ding H., Suzuki Y., Das P., Kadowaki K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(1)　740-740　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pBJ-5 Angle-resolved photoemission study of topological insulator Bi_<2-x>Sb_xTe_<3-y>Se_y

Arakane T., Sato T., Souma S., Kosaka K., Nakayama K., Komatsu M., Takahashi T., Ren Z., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　67　(1)　733-733　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aBJ-5 High-resolution ARPES study of topological insulator Pb(Bl_<1-x>Sb_x)_2Te_4

Souma S., Eto K., Nomura M., Nakayama K., Sato T., Takahashi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　67　(1)　728-728　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pYA-11 Anisotropic superconducting gap in LiFeAs observed by high-resolution ARPES

Nakayama K., Umezawa K., Li Y., Miao H., Liu Z. -H., Richard P., Sato T., He J. B., Wang D. -M., Chen G. F., Ding H., Wang S. -C., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(1)　697-697　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pYA-13 Electronic structure of iron-chalcogenide KFeAgTe_2 studied by ARPES

Ang R., Nakayama K., Sato T., Yin W. -G., Lei H. -C., Petrovic C., Takahashi T.

Meeting abstracts of the Physical Society of Japan　67　(1)　697-697　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pYA-12 High-resolution ARPES study of electronic structure on LaCo_2B_2 superconductor

Ieki E., Nakayama K., Umezawa K., Souma S., Sato T., Takahashi T., Kuroda M., Mizoguchi H., Kim S., Hosono H.

Meeting abstracts of the Physical Society of Japan　67　(1)　697-697　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pAD-3 Electronic structure of topological insulator Pb(Bi_<1-.x>Sb_x)_2Te_4 studied by high-resolution ARPES

Nomura M., Eto K., Souma S., Nakayama K., Sato T., Takahashi T., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　67　(1)　810-810　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aYD-2 Angle-resolved photoemission study of Bi-based Layered Co-oxide Bi_<2-x>Pb_xSr_2Co_2Oy

Arakane T., Sato T., Takahashi T., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　67　(1)　588-588　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
トポロジカル量子転移近傍におけるディラック電子の質量獲得

佐藤宇史, 瀬川耕司, 高橋隆, 安藤陽一

日本物理学会誌　67　(3)　184-188　2012/03
Publisher: 日本物理学会
角度分解光電子分光で見た鉄系超伝導体におけるディラック電子と擬ギャップ

中山耕輔, 佐藤宇史, 高橋隆

固体物理　47　(3)　121-127　2012
Publisher: アグネ技術センター
ISSN： 0454-4544
21pGL-9 High-resolution ARPES study of LiFeAs

Umezawa K., Kawahara T., Nakayama K., Richard P., Sato T., Chen G. F., Qian T., Ding H., Wang S. -C., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　487-487　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pTR-11 Direct observation of z-spin component in Dirac-cone surface state of Bi_2Te_3 by spin-resolved ARPES

Souma S., Kosaka K., Sato T., Komatsu M., Takayama A., Takahashi T., Kriener M., Segawa K., Ando Y.

Meeting abstracts of the Physical Society of Japan　66　(2)　701-701　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aTN-12 Electronic structure of Ni-doped 2H-TaS_2 system studied by ARPES

Ang R., Sugawara K., Nakayama K., Sato T., Li L. J., Lu W. J., Sun Y. P., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　721-721　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aTN-9 High-Resolution ARPES study of potassium doped bilayer graphene

Kleeman James, Kanetani K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　720-720　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pTR-4 Quantum phase transition of Tl-based topological insulator : high-resolution ARPES study

Sato T., Segawa K., Kosaka K., Souma S., Nakayama K., Eto K., Minami T., Ando Y., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　699-699　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pTL-6 Dirac fermions of iron-based superconductors

Sato Takafumi

Meeting abstracts of the Physical Society of Japan　66　(2)　687-687　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pGB-13 Hydration and superconductivity in Na_xCoO_2 : Angle-resolved photoemission spectroscopy

Arakane T., Sato T., Takahashi T., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　66　(2)　609-609　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pGM-2 Direct observation of quasiparticle peak in Fe(Te,Se) by high-resolution ARPES

Nakayama K., Tanaka Y., Umezawa K., Sato T., Miao H., Qian T., Richard P., Ding H., Gu G. D., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　624-624　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aHA-3 Dirac-cone topological surface states of TlBi(Se_xS_<1-x>)_2 studied by high-resolution ARPES

Kosaka K., Eto K., Segawa K., Souma S., Sato T., Ando Y., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　927-927　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aHA-8 Anisotropic Rashba effect of Bi(111) thin film studied by high-resolusion spin-resolved ARPES

Takayama A., Sato T., Souma S., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　929-929　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22aTE-10 High-resolution ARPES study of Ca-doped graphene

Kanetani K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　859-859　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22aTE-11 High-resolution ARPES study of K-doped bilayer graphene on H-terminated SiC

Sugawara K., Kanetani K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　860-860　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22aTN-9 Dirac-cone surface states of thallium-based topological insulators studied by high-resolution ARPES

Komatsu M., Eto K., Segawa K., Kosaka K., Souma S., Sato T., Ando Y., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(2)　761-761　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
高分解能角度分解光電子分光で見た鉄カルコゲナイド超伝導体の電子状態

中山耕輔, 佐藤宇史, 高橋隆

Photon Factory News　29　15-17　2011/08
28pTA-5 High-resolution ARPES of K-doped bilayer graphene on H-terminated SiC

Sugawara K., Kanetani K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　895-895　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aTB-5 Electronic structure of C_6LiC_6 grown on SiC : ultrahigh-resolution ARPES

Kanetani K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　845-845　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pEJ-6 High-resolution ARPES study of AFeAs(A=Li,Na)

Umezawa K., Kawahara T., Nakayama K., Richard P., Sato T., Chen G. F., Qian T., Ding H., Wang S.-C., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　613-613　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aHB-7 High-resolution ARPES study of electron-doped bilayer graphene

Kleeman J., Kanetani K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　769-769　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aHB-8 High-resolution ARPES study of thallium-based topological insulators

Komatsu M., Eto K., Segawa K., Kosaka K., Souma S., Sato T., Ando Y., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　769-769　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pGW-9 Se concentration dependence of electronic structure in Fe(Te,Se) studied by ARPES

Tanaka Y., Nakayama K., Umezawa K., Kawahara T., Sato T., Miao H., Qian T., Richard P., Ding H., Wen H.-H., Gu G. D., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　642-642　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aTH-8 Anomalous Rashba effect of Bi(111) surface studied by high-resolusion spin-resolved ARPES

Takayama A., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　915-915　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aTH-1 Electronic structure of topological insulator TlBi(Se_xS_<1-x>)_2 studied by high-resolution ARPES

Kosaka K., Eto K., Segawa K., Souma S., Sato T., Ando Y., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　913-913　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aHG-5 High-resolution ARPES study of new topological insulator TlBiSe_2

Souma S., Segawa K., Sato T., Guo H., Sugawara K., Ando Y., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　707-707　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pTA-6 Dirac fermions of iron-based superconductors

Sato Takafumi

Meeting abstracts of the Physical Society of Japan　66　(1)　717-717　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aED-5 Hydration effects on the superconductivity of Na_xCoO_2 studied by angle-resolved photoemission spectroscopy

Arakane T., Sato T., Takahashi T., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　66　(1)　521-521　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aEE-11 High-resolution ARPES study of LaFe_2P_2

Nakayama K., Kawahara T., Richard P., Umezawa K., Sato T., Capan C., Fisk Z., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　66　(1)　526-526　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
ARPESでみた鉄系超伝導体の超伝導ギャップと擬ギャップ(鉄系高温超伝導の物理,研究会報告)

佐藤宇史

物性研究　96　(5)　553-553　2011
Publisher: 物性研究刊行会
ISSN： 0525-2997
23pRA-11 High-resolution ARPES study of Li-doped bilayer graphene

Kanetani K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　780-780　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aWH-11 High-resolution ARPES study of iron-pnictide superconductor NaFeAs

Umezawa K., Wang S.-C., Nakayama K., Richard P., Kawahara T., Sato T., Chen G. F., Qian T., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　454-454　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aWH-1 Electron-hole asymmetry of Ba122 system : photoemission spectroscopy

Richard P., Neupane M., Sato T., Xu Y.-M., Nakayama K., Fedrov A. V., Xu G., Dai X., Fang Z., Wang Z., Chen G.-F., Wang N.-L., Wen H.-H., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　451-451　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aWH-2 High-resolution ARPES study of CaFe_2P_2

Kawahara T., Richard P., Nakayama K., Umezawa K., Sato T., Capan C., Fink Z., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　451-451　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aWH-5 High-resolution ARPES study of Ba_<0.3>K_<0.7>Fe_2As_2

Nakayama K., Kawahara T., Umezawa K., Richard P., Sato T., Xu X.-M., Neupane M., Qian T., Ding H., Chen G. F., Luo J. L., Wang N. L., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　452-452　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aWX-3 Spin-resolved electronic structure of Bi(111) surface

Takayama A., Kosaka K., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　873-873　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pRG-2 Development of spin-resolved photoemission spectrometer based on mini-Mott detector: IV

Souma S., Takayama A., Sugawara K., Guo H., Kosaka K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　682-682　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aRC-11 Doping Dependence of 3D Electronic States in Na_xCoO_2 Studied by High-Resolution ARPES

Arakane T., Richard P., Sato T., Takahashi T., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　65　(2)　691-691　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aWJ-11 Anomalous electronic structure of CeSb : xenon-plasma-light ARPES

Kosaka K., Takayama A., Souma S., Arakane T., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　620-620　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pRE-9 High-resolution ARPES study of Bi_<1-x>Sb_x(x=0.023)

Guo H., Sugawara K., Takayama A., Souma S., Sato T., Sato N., Sasaki M., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(2)　703-703　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
C6Caの層間電子超伝導

菅原克明, 佐藤宇史, 高橋隆

日本物理学会誌　65　(4)　256-259　2010/04/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 0029-0181

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We report angle-resolved photoemission spectroscopy (ARPES) of C_6Ca, graphite intercalation compound (GIC) with the highest superconducting transition temperature. We determined the band structure and Fermi surface, and succeeded in directly observing the superconducting gap and its symmetry for each Fermi surface. The present ARPES results have established that the interlayer electrons play an essential role in realizing the superconductivity of GICs.
20pGH-1 Xenon-plasma-excited ARPES study of LaFeAsO

Kawahara T., Umezawa K., Qian T., Guo H., Nakayama K., Richard P., Sato T., Souma S., Wang N. -L., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(1)　562-562　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pGH-3 Electronic structure of Ba_2Fe_2As_2 in the magnetic state

P. Richard, Nakayama K., Sekiba Y., Kawahara T., Sato T., Xu Y. -M., Neupane M., Bowen J. H., Chen G. F., Luo J. L., Wang N. L., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(1)　562-562　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pGQ-1 Ultrahigh-resolution spin-resolved ARPES study of Bi thin film

Takayama A., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(1)　931-931　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pGP-3 High-resolution ARPES study of Li-doped graphene on SiC

Sugawara K., Kanetani K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(1)　878-878　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aGH-12 High-resolution ARPES study of (Sr_2VO_3) FeAs

Nakayama K., Qian T., Sekiba Y., Kawahara T., P. Richard, Sato T., Ding H., Cheng P., Wen H. -H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(1)　676-676　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pGD-13 Doping Dependence of 3D Fermi Surface in Na_xCoO_2 Studied by High-Resolution ARPES

Arakane T., P. Richard, Sato T., Takahashi T., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　65　(1)　651-651　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pGA-7 Bulk Pseudogap of Bi2201 Studied by ARPES

Sato T., Nakayama K., Takahashi T., Kudo K., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　65　(1)　550-550　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pHL-9 Development of spin-resolved photoemission spectrometer based on mini-Mott detector: III

Souma S., Takayama A., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(1)　811-811　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pHL-1 High-resolution ARPES study of single- and multi-layer graphene

Kanetani K., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　65　(1)　809-809　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Pairing symmetry of iron-based superconductors

Takafumi Sato

Parity　25　(1)　16-18　2010/01
鉄系超伝導のクーパー対の対称性

佐藤宇史

パリティ　25　(1)　2010/01
25pRL-1 Comparison of electronic structure between electron- and hole-doped Iron-based superconductors by ARPES

Sato T., Nakayama K., Richard P., Sekiba Y., Kawahara T., Terashima K., Wang N. L., Xu Z.-A., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(2)　456-456　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pRL-14 Fermi surface and band structure of FeTe_<1-x>Se_x studied by high-resolution ARPES

Nakayama K., Richard P., Sekiba Y., Kawahara T., Qian T., Sato T., Kubota M., Ono K., Chen G. F., Luo J. L., Wang N. L., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(2)　459-459　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pRL-2 Doping Dependence of Superconducting Gap in Ba_<1-x>K_xFe_2As_2 : High-Resolution ARPES

Kawahara T., Xu Y. -M., Richard P., Nakayama K., Sekiba Y., Qian T., Neupane N., Souma S., Sato T., Luo H., Wen H. -H., Chen G. -F., Wang N. -L., Fang Z., Dai X., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(2)　456-456　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pRL-8 High resolution ARPES study of BaFe_2As_2

Richard P., Nakayama K., Sekiba Y., Kawahara T., Sato T., Xu Y. -M., Neupane M., Bowen J. H., Chen G. F., Luo J. L., Wang N. L., Dring H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(2)　457-457　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aXA-7 3-Dimensional Fermi Surface of Na_xCoO_2 Studied by Angle-Resolved Photoemission Spectroscopy

Arakane T., Nakayama K., Qian T., Sato T., Takahashi T., Kubota M., Ono K., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　64　(2)　630-630　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aYG-4 Development of a mini-Mott spin detector and Rashba effect in surface electronic states of group-V semimetals

Takayama A., Souma S., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(2)　834-834　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pYE-6 High-resolution ARPES study of high quality growth graphene

Sugawara K., Takayama A., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(2)　783-783　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pXA-9 Development of spin-resolved photoemission spectrometer based on a mini-Mott detector: II

Souma S., Takayama A., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(2)　636-636　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aRH-1 Electronic Structure of Iron-Based Superconductors Studied by High-Resolution ARPES

Sato Takafumi

Meeting abstracts of the Physical Society of Japan　64　(2)　405-405　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
黒鉛超伝導体のメカニズムを解明

佐藤宇史, 菅原克明, 高橋隆

技術総合誌OHM　96　(4)　8-9　2009/04/01
Publisher: オーム社
グラフェンの光電子分光

菅原克明, 佐藤宇史, 高橋隆

グラフェンの機能と応用展望　2009/04/01
Publisher: シーエムシー出版
30pTC-11 Fermi surface and band structure of electrondoped iron-pnictide BaFe_<2-x>Co_xAs_2 (x=0.15, 0.3) studied by high-resolution ARPES

Sekiba Y., Kawahara T., Nakayama K., Terashima K., Sato T., Richard P., Bowen J. H., Xu Y.-M., Li L. J., Cao G. H., Xu Z.-A., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　663-663　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aTL-2 Observation of the electronic-structure evolution across metal-insulator transition of heavily B-doped diamond by photoemission spectroscopy

Okazaki H., Arakane T., Sugawara K., Sato T., Takahashi T., Wakita T., Muraoka Y., Hirai M., Takano Y., Ishii S., Iriyama S., Kawarada H., Yokoya T.

Meeting abstracts of the Physical Society of Japan　64　(1)　654-654　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30pTC-10 Superconducting gap in electron-doped BaFe_<1.85>Co_<0.15>As_2 : high-resolution ARPES study

Terashima K., Sekiba Y., Kawahara T., Nakayama K., Sato T., Richard P., Bowen J. H., Xu Y.-M., Li L. J., Cao G. H., Xu Z.-A., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　663-663　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30pTC-8 Fine electronic structure near the Fermi level of Ba_<1-x>K_xFe_2As_2 studied by high-resolution ARPES

Nakayama K., Richard P., Sekiba Y., Sato T., Souma S., Neupane M., Xu Y.-M., Dai X., Fang Z., Chen G. F., Luo J. L., Wang N. L., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　662-662　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30pTC-9 Orbital-selective electron-mode coupling in optimally doped Ba_<0.6>K_<0.4>Fe_2As_2 : an ARPES investigation

Richard P., Sato T., Nakayama K., Souma S., Xu Y.-M., Chen G. F., Luo J. L., Wang N. L., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　662-662　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aTL-6 SDW gap of highly-doped Na_xCoO_2 : High-resolution ARPES

Arakane T., Nakayama K., Richard P., Qian T., Kubota M., Ono K., Fujii T., Asamitsu A., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　591-591　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aVA-7 Temperature dependence of band structure in CeSb studied by Xenon-plasma-light high-resolution ARPES

Takayama A., Souma S., Arakane T., Nakayama K., Sekiba Y., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　763-763　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29pVA-7 Angle-resolved photoemission study of quasi-one-dimensional metallic compound NaV_2O_4

Qian T., Sato T., Nakayama K., Arakane T., Richard P., Arai M., Yamaura K., Takayama-Muromachi E., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　756-756　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aVA-1 High-resolution ARPES study of electron-doped Fe-based superconductor BaFe_<2-x>Co_xAs_2

Kawahara T., Sekiba Y., Nakayama K., Terashima K., Sato T., Richard P., Bowen J. H., Xu Y.-M., Li L. J., Cao G. H., Xu Z.-A., Ding H., Takahashi T., Xu X.-A.

Meeting abstracts of the Physical Society of Japan　64　(1)　761-761　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aVA-10 Development of spin-resolved photoemission spectrometer based on mni-Mott detector

Souma S., Takayama A., Mori T., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　763-763　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aVA-2 Direct observation of superconducting gap in iron-based superconductor Ba_<1-x>K_xFe_2As_2 by ARPES

Sato T., Ding H., Richard P., Nakayama K., Sugawara K., Arakane T., Sekiba Y., Takayama A., Souma S., Wang Z., Dai X., Fang Z., Chen G. F., Luo J. L., Wang N. L., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　761-761　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aYH-6 Surperconducting gap and electron-phonon interaction in CaC_6 : high-resolution ARPES

Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　812-812　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aYH-6 Sample growth and high-resolution ARPES study of single- and multi-layer graphene

Ise K., Sugawara K., Takayama A., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　64　(1)　828-828　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Doping dependence of the gap anisotropy of the high-temperature YBa2Cu3O7-δ superconductor

K. Nakayama, T. Sato, K. Terashima, T. Arakane, T. Takahashi, M. Kubota, K. Ono, T. Nishizaki, Y. Takahashi, N. Kobayashi

Phys. Rev. B　79　(14)　140503　2009

DOI： 10.1103/PhysRevB.79.140503 　

ISSN： 1098-0121
20aYD-1 High-resolution ARPES study on Pb/Si(111)

Mizuno K., Tago Y., Sun Yujie, Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(2)　619-619　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aYD-2 Electronic states of In-"1x1"/Si(111) : Temperature dependence

Tago Y., Sun Yujie, Mizuno K., Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(2)　619-619　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pQA-17 High-resolution photoemission study of quasi one-dimensional half-metal NaV_2O_4

Qian T., Nakayama K., Sato T., Takahashi T., Yamaura K., Takayana-Muromachi E.

Meeting abstracts of the Physical Society of Japan　63　(2)　549-549　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pQF-2 Observation of overdoped surface state in underdoped ortho-II-phase YBa_2Cu_3O_<6.5>

Richard P., Nakayama K., Arakane T., Sato T., Li S., Dai P., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(2)　558-558　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aWF-2 Ultrahigh-resolution ARPES study of CaC_6

Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(2)　746-746　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aYG-8 Xenon-plasma-light high-resolution ARPES study of CeSb

Takayama A., Souma S., Nakayama K., Sekiba Y., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(2)　639-639　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aQE-7 High-resolution ARPES study of high doped Na_xCoO_2

Arakane T., Nakayama K., Sato T., Takahashi T., Ding H., Kubota M., Ono K., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　63　(2)　486-486　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pQE-10 Xenon-plasma-light ARPES study of pseudogap in Pb-substituted Bi2201

Nakayama K., Sato T., Terashima K., Sekiba Y., Souma S., Takahashi T., Kudo K., Okumura N., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　63　(2)　455-455　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pQE-9 High-resolution ARPES study of Fe-doped Bi2201

Sekiba Y., Nakayama K., Sato T., Takahashi T., Hiraka H., Kudo K., Fujita M., Yamada K.

Meeting abstracts of the Physical Society of Japan　63　(2)　455-455　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pQE-7 Superconducting gap and pseudogap in impurity-substituted La_<1.85>Sr_<0.15>CuO_4 studied by high-resolution ARPES

Terashima K., Nakayama K., Qian Tian, Sato T., Takahashi T., Kofu M., Hirota K.

Meeting abstracts of the Physical Society of Japan　63　(2)　454-454　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aQF-10 Xenon-plasma-light high-resolution PES study of Yb_4As_3

Souma S., Arakane T., Nakayama K., Takayama A., Sekiba Y., Sato T., Takahashi T., Ochiai A.

Meeting abstracts of the Physical Society of Japan　63　(2)　444-444　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aYA-14 High-resolution photoemission study of La(O_<1-x>F_x)FeAs

Sato T., Souma S., Nakayama K., Terashima K., Sugawara K., Takahashi T., Kamihara Y., Hirano M., Hosono H.

Meeting abstracts of the Physical Society of Japan　63　(2)　448-448　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
角度分解光電子分光から見た高温超伝導体YBa2CuO7のバルクー表面電子状態

中山耕輔, 佐藤宇史, 高橋隆

PF NEWS　26　(2)　14-17　2008/08
Publisher: 高エネルギー物理学研究所
角度分解光電子分光で見た高温超伝導体YBa2Cu3O7-δのバルク・表面電子状態

中山耕輔, 佐藤宇史, 高橋隆

PF News　26　22-25　2008/08/01
角度分解光電子分光による鉄系超伝導体(Ba,K)Fe2As2の多重超伝導ギャップ

佐藤宇史, H. Ding, 相馬清吾, 高橋隆

固体物理　43　(8)　499-506　2008/08/01
Publisher: アグネ技術センタ-
ISSN： 0454-4544
25pYJ-4 Development of high-resolution photoemission spectrometer and ARPES study of high-Tc cuprate superconductors

Sato Takafumi

Meeting abstracts of the Physical Society of Japan　63　(1)　730-730　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aWR-4 Xenon-plasma-light high-resolution PES study of SmNiC_2

Souma S., Nakayama K., Sato T., Takahashi T., Shimomura S., Onodera H.

Meeting abstracts of the Physical Society of Japan　63　(1)　514-514　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pYB-11 Metal-insulator transition of Na_<0.5>CoO_2 studied by high-resolution ARPES

Arakane T., Nakayama K., Raj S., Sato T., Takahashi T., Kamakura N., Kubota M., Ono K., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　63　(1)　614-614　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pRH-9 High-resolution photoemission spectroscopy of heavily B-doped diamond : Electronic structure evolution across metal-insulator transition

Okazaki H., Sugawara K., Sato T., Takahashi T., Wakita T., Muraoka Y., Hirai M., Takano Y., Ishii S., Iriyama S., Kawarada H., Yokoya T.

Meeting abstracts of the Physical Society of Japan　63　(1)　616-616　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pRH-12 Xenon-plasma-light high-resolution photoemission study of cement superconductor [Ca_<24>Al_<28>O_<64>]^4+(e^-)^4

Arakane T., Souma S., Sato T., Takahashi T., Kim S.-W., Hosono H.

Meeting abstracts of the Physical Society of Japan　63　(1)　617-617　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pTD-4 Temperature-dependent Fermi surface of In-"1x1"/Si(111)

Tago Y., Sun Yujie, Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(1)　907-907　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aRH-4 Xenon-plasma-light ARPES study of superconducting gap and pseudogap in Bi2201

Nakayama K., Sekiba Y., Terashima K., Souma S., Sato T., Takahashi T., Okumura N., Kudo K., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　63　(1)　630-630　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pYH-13 Fermi surface of TI-doped PbTe : High-resolution ARPES

Nakayama K., Raj tyabrata, Arakane T., Sato T., Kamakura N., Kubota M., Ono K., Murakami H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(1)　725-725　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aRJ-5 Ultrahigh-resolution ARPES study of group-V semimetals

Sato Takafumi

Meeting abstracts of the Physical Society of Japan　63　(1)　468-468　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pYH-3 ARPES study of kish graphite at 1000K

Sugawara K., Nakayama K., Sato O., Souma S., Sato T., Takahashi T., Suematsu H.

Meeting abstracts of the Physical Society of Japan　63　(1)　722-722　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pYH-5 Band structure of Pb ultra-thin film studied by high-resolution ARPES

Sun Y.J., Tago Y., Sugawara K., Souma S., Sato T., Zhang Y.F., Xue Q.K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　63　(1)　723-723　2008/02/29
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
グラファイトにおける準粒子とエッジ局在状態

菅原克明, 佐藤宇史, 高橋隆

固体物理　42　(12)　903-910　2007/12/01
Publisher: アグネ技術センタ-
ISSN： 0454-4544
24aXK-6 High-resolution ARPES Study of Pb Ultra-thin Film

Sun Y.J., Tago Y., Sugawara K., Souma S., Sato T., Zhang Y.F., Xue Q.K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　62　(2)　964-964　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pWH-9 Evolution of CDW state in monophosphate tungsten bronze, P_4W_<12>O_<44> : An ARPES study

Raj S., Nakayama K., Arakane T., Sato T., Takahashi T., Sarma D. D., Greenblatt M.

Meeting abstracts of the Physical Society of Japan　62　(2)　664-664　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pWH-10 Charge-desity-wave transition of Na_xCoO_2 studied by high-resolution angle-resolved photoemission spectroscopy

Arakane T., Nakayama K., Raj S., Sato T., Takahashi T., Kamakura N., Kubota M., Ono K., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　62　(2)　637-637　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aTK-2 High-Resolution ARPES study of 1H-, 5H-.and 6H- CaAISi

Xiao Y. X., Sugawara K., Souma S., Sato T., Takahashi T., Kamakura N., Kubota M., ono K., Kuroiwa S., Akimitsu J.

Meeting abstracts of the Physical Society of Japan　62　(2)　718-718　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aTK-3 High-resolution ARPES study of ln-"1x1"/Si(111)

Tago Y., Sun Yujie, Sugawara K., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　62　(2)　718-718　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aRA-3 High-resolution ARPES study of graphene

Sun Y.J.

Meeting abstracts of the Physical Society of Japan　62　(2)　892-892　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aWG-2 Xenon-plasma-light bulk-sensitive ultrahigh-resolution photoemission study of Bi2201

Nakayama K., Sato T., Terashima K., Souma S., Takahashi T., Okumura N., Kudo K., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　62　(2)　648-648　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22aWF-12 Xenon-plasma-light bulk-sensitive ultrahigh-resolution photoemission study of Co (S_<1-x>S_x)_2

Sato T., Souma S., Sugawara K., Nakayama K., Raj Satyabrata, Hiraka H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　62　(2)　583-583　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
キセノンプラズマ発光によるバルク敏感高分解能光電子分光

相馬清吾, 佐藤宇史, 高橋隆

応用物理学会薄膜・表面物理分科会ニュースレター　128　27-33　2007/03/01
18aWF-8 Superconducting gap of La_2C_3 : ultrahigh-resolution PES

Sugawara K., Sato T., Souma S., Takahashi T., Ochiai A.

Meeting abstracts of the Physical Society of Japan　62　(1)　488-488　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aWF-6 Three-dimensional band structure of Na_xWO_3 studied by high-resolution ARPES

Raj S., Sato T., Takahashi T., Chakraborty A., Choudhury D., Sarrna D. D., Mahadevan P.

Meeting abstracts of the Physical Society of Japan　62　(1)　605-605　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20aWF-10 High-resolution ARPES study of Tl-doped PbTe

Sato T., Nakayama K., Takahashi T., Murakami H.

Meeting abstracts of the Physical Society of Japan　62　(1)　606-606　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
18aWK-10 Doping dependence Of electronic states in YBa_2Cu_3O_<7-δ> studied by high-resolution ARPES

Nakayama K., Terashima K., Matsui H., Sato T., Takahashi T., Kubota M., Ono K., Nishizaki T., Takahashi Y., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　62　(1)　494-494　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aWG-9 Electronic structure of M_xCoO_2(M:Na,K,Rb) studied by high-resolution ARPES

Arakane T., Sato T., Takahashi T., Ding H., Fujii T., Asamitsu A.

Meeting abstracts of the Physical Society of Japan　62　(1)　641-641　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pZA-9 ARPES Studies of Metal-Insulator Transition on In(4×1)/Si(111)

Agario S., Sun Y. J., Sugawara K., Kondo G., Tago Y., Souma S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　62　(1)　746-746　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
18aWF-2 Superstructure-dependence of electronic states in CaAlSi studied by high-Resolution ARPES

Xiao Y. X, Sugawara K, Nakajima Y, Souma S, Sato T, Takahashi T, Kubota M, Ono K, Kuroiwa S, Akimitsu J

Meeting abstracts of the Physical Society of Japan　62　(1)　487-487　2007/02/28
Publisher: 一般社団法人日本物理学会
ISSN： 1342-8349
18aWK-7 High-resolution angle-resolved photoemission study of La_<2-x>Sr_xCu_<1-y>Mn_yO_4

Terashima K, Matsui H, Sato T, Takahashi T, Campuzano J. C, Kofu M, Enoki K, Fujita M, Yamada K

Meeting Abstracts of the Physical Society of Japan　62　(0)　493-493　2007
Publisher: The Physical Society of Japan
ISSN： 1342-8349
Bulk and surface low-energy excitations in Y Ba2 Cu3 O7-δ studied by high-resolution angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, K. Terashima, H. Matsui, T. Takahashi, M. Kubota, K. Ono, T. Nishizaki, Y. Takahashi, N. Kobayashi

Physical Review B - Condensed Matter and Materials Physics　75　(1)　014513　2007

DOI： 10.1103/PhysRevB.75.014513 　

ISSN： 1098-0121

eISSN： 1550-235X
超高分解能光電子分光—フェルミ面微細電子構造と準粒子—

佐藤宇史

応用物理学会薄膜・表面物理分科会ニュースレター　128　6-9　2006/12/01
"Magnetic isotope effect" on high-temperature superconductors studied by angle-resolved photoemission spectroscopy

K. Terashima, T. Sato, T. Takahashi

日本物理学会誌　61　(11)　830-834　2006/11/01
26pZR-9 ARPES study on the nordal quasiparticle state in high-T_c superconductors : Comparison between the electron- and hole-doped system

Matsui H., Nakayama K., Terashima K., Sato T., Takahashi T., Fujita M., Yamada K.

Meeting abstracts of the Physical Society of Japan　61　(2)　521-521　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pZR-10 Band dispersion and fine structure of superconducting gap in La_<2-x>Sr_xCuO_4(x=0.1,0.15)

Terashima K., Xiao Y.X., Nakayama K., Matsui H., Sato T., Takahashi T., Kofu M., Hirota K.

Meeting abstracts of the Physical Society of Japan　61　(2)　521-521　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pZR-15 Electronic structure of A_xWO_3(A=K,Na): High-resolution ARPES studies

Raj S., Souma S., Matsui H., Sato T., Takahashi T., Sarma D.D., Mahadevan P., McCarroll W.H., Greenblatt M., Ohishi S.

Meeting abstracts of the Physical Society of Japan　61　(2)　481-481　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aQE-3 Superconducting Gap and Pseudogap in La_<2-x>Sr_xCuO_4 : High-Resolution ARPES

Xiao Y.X., Terashima K., Nakayama K., Matsui H., Sato T., Takahashi T., Kofu M., Hirota K.

Meeting abstracts of the Physical Society of Japan　61　(2)　621-621　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pZA-2 CDW gap and small Fermi surface of quasi-two-dimensional conductor η-Mo_4O_<11> studied by high-resolution ARPES

Agario S., Sato T., Takahashi T., Koyano M.

Meeting abstracts of the Physical Society of Japan　61　(2)　637-637　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pQE-10 Spin-orbit coupling at Bi(111) surface studied by high-resolution ARPES

Kondo G., Sugawara K., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　61　(2)　588-588　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pZQ-2 High-Resolution ARPES study of M_xCoO_2 (M: Alkali metal)

Arakane T., Sato T., Takahashi T., Fujii T., Asamitu A.

Meeting abstracts of the Physical Society of Japan　61　(2)　474-474　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aZR-10 High-resolution ARPES study of RAgSb_2(R=La,Ce)

Sato T., Arakane T., Souma S., Takahashi T., Watanabe Y., Inada Y.

Meeting abstracts of the Physical Society of Japan　61　(2)　519-519　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pZR-2 Fine structure of Fermi surface in YBa_2Cu_3O_<7-δ>

Nakayama K., Matsui H., Terashima K., Sato T., Takahashi T., Kubota M., Ono K., Nishizaki T., Takahashi Y., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　61　(2)　519-519　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pZR-3 Superconducting gap and pseudogap in Bi2201 studied by high-resolution ARPES

Nakayama K., Terashima K., Matsui H., Sato T., Takahashi T., Kondo T., Takeuchi T., Miyoshi Y., Kudo K., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　61　(2)　519-519　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aYH-1 High-resolution ARPES study of As(111)

Sugawara K., Kondo G., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　61　(2)　721-721　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aZB-5 Anomaly of π band Fermi surface of graphite : high-resolution ARPES

Sugawara K., Souma S., Sato T., Takahashi T., Suematsu H.

Meeting abstracts of the Physical Society of Japan　61　(2)　709-709　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aRA-8 Impurity effects on quasiparticles in LSCO as a function of Zn-substitution amount : high-resolution ARPES

Terashima K., Xiao Y.X., Nakayama K., Matsui H., Sato T., Takahashi T., Kofu M., Hirota K.

Meeting abstracts of the Physical Society of Japan　61　(1)　642-642　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29pRE-3 Many-body interaction in Cu(111) studied by high-resolution ARPES

Komoda H., Agario S., Sato T., Takahashi T.

Meeting abstracts of the Physical Society of Japan　61　(1)　754-754　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29pRE-2 Many body interaction of kish graphite studied by ultrahigh-resolution ARPES

Sugawara K., Sato T., Souma S., Takahashi T., Suematsu H.

Meeting abstracts of the Physical Society of Japan　61　(1)　753-753　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aYB-4 Electronic structure near the Fermi level of Bi(111) studied by ultrahigh-resolution ARPES

Takahashi T., Sugawara K., Sato T.

Meeting abstracts of the Physical Society of Japan　61　(1)　879-879　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29pRE-1 Electronic structure of quasi-two-dimensional conductor η-Mo_4O_<11> studied by high-resolution ARPES

Agario S., Komoda H., Sato T., Takahashi T., Koyano M.

Meeting abstracts of the Physical Society of Japan　61　(1)　753-753　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pRF-2 Superconduting Quasiparticle Peak in High-T_c Superconductor LSCO : High-Resolution ARPES

Xiao Y.X., Terashima K., Nakayama K., Matsui H., Sato T., Takahashi T., Kofu M., Hirota K.

Meeting abstracts of the Physical Society of Japan　61　(1)　747-747　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aRA-10 Doping Dependence of the Superconducting Gap in Pr_<1-x>LaCe_xCuO_4 Studied by Angle-Resolved Photoemission Spectroscopy

Matsui H., Terashima K., Sato T., Takahashi T., Fujita M., Yamada K.

Meeting abstracts of the Physical Society of Japan　61　(1)　643-643　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Shadow bands in single-layered Bi2Sr2CuO6+δ studied by angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, T. Dobashi, K. Terashima, S. Souma, H. Matsui, T. Takahashi, J. C. Campuzano, K. Kudo, T. Sasaki, N. Kobayashi, T. Kondo, T. Takeuchi, K. Kadowaki, M. Kofu, K. Hirota

Phys. Rev. B　74　(5)　054505　2006

DOI： 10.1103/PhysRevB.74.054505 　

ISSN： 1098-0121
Ultrahigh-resolution photoemission spectroscopy

T. Sato, H. Matsui, T. Takahashi

応用物理学会誌　74　(10)　1305-1315　2005/10/01
20aYJ-5 High-resolution ARPES study of A_xWO_3(A:Alkali metal)

Hashimoto D., Raj S., Matsui H., Ray S., Sarma D. D., Souma S., Sato T., Takahashi T., Ohishi S., McCarroll W. H., Greenbalatt M.

Meeting abstracts of the Physical Society of Japan　60　(2)　427-427　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pXD-11 Doping dependence of electronic structure in Na_xCoO_2 studied by ARPES

Sato T., Dobashi T., Yang H. -B., Wang S. -C., Ding H., Soma S., Matsui H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　60　(2)　486-486　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYG-2 Doping Dependence of Electronic States in Pr_<1-x>LaCe_xCuO_4 Studied by Angle-Resolved Photoemission Spectroscopy

Matsui H., Terashima K., Sato T., Takahashi T., Fujita M., Yamada K.

Meeting abstracts of the Physical Society of Japan　60　(2)　385-385　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYG-1 Present status of ultrahigh-resolution ARPES on high-Tc superconductors : Many-body interaction and pairing symmetry

Sato T.

Meeting abstracts of the Physical Society of Japan　60　(2)　385-385　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYG-6 Quasiparticles in Zn-substituted La_<1.85>Sr_<0.15>CuO_4 studied by angle-resolved photoemission

Terashima K., Nakayama K., Dobashi T., Matsui H., Sato T., Takahashi T., Kofu M., Hirota K.

Meeting abstracts of the Physical Society of Japan　60　(2)　386-386　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYG-4 Origin of shadow band in Pb-substituted Bi_2Sr_2CuO_6 studied by high-resolution ARPES

Dobashi T., Nakayama K., Terashima K., Matsui H., Sato T., Takahashi T., Kondo T., Takeuchi T., Miyoshi Y., Kudou K., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　60　(2)　386-386　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pYD-11 High-resolution ARPES study of insulating Na_xWO_3 : Anderson localization(English Session of Division 5)

Raj S., Hashimoto D., Matsui H., Ray S., Sarma D. D., Souma S., Sato T., Takahashi T., Ohishi S.

Meeting abstracts of the Physical Society of Japan　60　(2)　618-618　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYL-10 Rare-earth dependence of electronic structure in RTe_3 : High-resolution ARPES

Agario S., Komoda H., Sato T., Takahashi T., Suzuki S., Suzuki K.

Meeting abstracts of the Physical Society of Japan　60　(2)　638-638　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pYD-3 Many-body interaction in CeTe_3 studied by high-resolution ARPES

Komoda H., Agario S., Sato T., Takahashi T., Suzuki S., Suzuki K.

Meeting abstracts of the Physical Society of Japan　60　(2)　616-616　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pYD-2 Superconductivity/Charge-Density-Wave Transition Mechamism of InxNb_3Se_4 Studied by High-Resolution ARPES

Dobashi T., Nakayama K., Sato T., Takahashi T., Kaneko H., Okamoto H., Ishihara Y.

Meeting abstracts of the Physical Society of Japan　60　(2)　616-616　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYD-14 Fine structure of Fermi surface in Bi_2Sr_2Cu0_6 studied by high-resolution ARPES

Nakayama K., Dobashi T., Terashima K., Matsui H., Sato T., Takahashi T., Kondo T., Takeuchi T., Miyoshi Y., Kudo K., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　60　(2)　574-574　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYD-2 Observation of anisotropic spin-orbit coupling in Sb(111) by high-resolution ARPES

Sugawara K., Sato T., Souma S., Arai M., Sasaki T., Kubota M., Ono K., Takahashi T.

Meeting abstracts of the Physical Society of Japan　60　(2)　571-571　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pYG-1 Present status of ultrahigh-resolution ARPES on high-Tc superconductors : Many-body interaction and pairing symmetry

Sato T.

Meeting abstracts of the Physical Society of Japan　60　(2)　574-574　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pXF-9 High-resolution ARPES study of Sb(111) surface : electron-phonon interaction

Sugawara K., Sato T., Souma S., Takahashi T., Arai M., Sasaki T.

Meeting abstracts of the Physical Society of Japan　60　(2)　789-789　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pXF-8 High-resolution ARPES study of Sb(111) surface : band structure and Fermi surface

Sugawara K., Sato T., Souma S., Takahashi T., Arai M., Sasaki T.

Meeting abstracts of the Physical Society of Japan　60　(2)　789-789　2005/08/19
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pWA-1 Superconducting-Gap Symmetry in Pr_<0.89>LaCe_<0.11>CuO_4 : Studied by Angle-Resolved Photoemission Spectroscopy

Matsui H., Terashima K., Sato T., Takahashi T., Fujita M., Yamada K.

Meeting abstracts of the Physical Society of Japan　60　(1)　552-552　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pWA-3 Interaction in Pb-substituted Bl2201 studied by ARPES

Dobashi T., Takahashi T., Nakayama K., Terashima K., Matsui H., Sato T., Miyoshi Y., Kudoi K., Sasaki T., Kobayashi N.

Meeting abstracts of the Physical Society of Japan　60　(1)　552-552　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pWE-5 Angle-resolved photoemission study of quasi-one-dimensional conductor BaVS_3

Komoda H., Aaario S., Sato T., Takahashi T., Nakamura H.

Meeting abstracts of the Physical Society of Japan　60　(1)　555-555　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pWF-11 X-ray angle-resolved photoemission study of Na_xCoO_2

Dobashi T., Sato T., Takahashi T., Yang H.-B., Wang S. -C., Ding H.

Meeting abstracts of the Physical Society of Japan　60　(1)　560-560　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pWF-10 Many-body interaction in Na_xCoO_2 studied by high-resolution ARPES

Sato T., Dobashi.T., Yang H.-B., Wang S.-C., Drig H., Souma S., Matsui H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　60　(1)　560-560　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pWA-2 Angle-resolved photoemission study of Zn-substituted La_<1.85>Sr_<0.15>CuO_4

Terashima K., Dobashi T., Nakayama K., Matsui H., Sato T., Takahashi T., Kof M., Hirota K.

Meeting abstracts of the Physical Society of Japan　60　(1)　552-552　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aXQ-6 Electronic structure near the Fermi level of kish graphite

Souma S., Sato T., Takahashi T., Suematsu H.

Meeting abstracts of the Physical Society of Japan　60　(1)　694-694　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pXP-7 CBand sturucture of Ce_2TIn_8 (T=Co,Rh) : high-resolution ARPES

Iida Y., Raj S., Souma S., Sato T., Takahashi T., Harima H., Hayakawa T., Ohara H., Sakamoto I.

Meeting abstracts of the Physical Society of Japan　60　(1)　685-685　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pXP-8 Doping dependence of the electronic structure in Na_xWO_3 studied by angle-resolved photoemission spectroscopy

Hashimoto D., Ray S., Matsui H., Sarma D. D., Souma S., Sato T., Takahashi T., Ohishi S., McCarroll W. H., Greenblatt M.

Meeting abstracts of the Physical Society of Japan　60　(1)　685-685　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aXQ-5 Electron-phonon interaction in Sb(111) surface ; high-resolution ARPES

Sugawara K., Ono K., Sato T., Souma S., Takahashi T., Arai M., Sasaki T.

Meeting abstracts of the Physical Society of Japan　60　(1)　694-694　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pWF-13 ARPES studies on highly metallic sodium tungsten bronzes Na_xWO_3

Raj S, Hashimoto, Matsui H, Ray S, Sarma D, Souma S, Sato T, Takahasni T, Ohishi S, McCarrall W H, Greenblatt M

Meeting abstracts of the Physical Society of Japan　60　(1)　507-507　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
12pTM-3 Coexistence/Competition between Superconductivity and Charge-Density Wave in Quasi-1D Conductors Nb_3Xc_4 (Xc=S, Se, Te) Studied by High-Resolution ARPES

Dobashi T., Sato T., Souma S., Takahashi T., Ishihara Y.

Meeting abstracts of the Physical Society of Japan　59　(2)　699-699　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
12aXC-9 Metal-Insulator Transition of Na_xWO_3 studied by high-resolution photoemission spectroscopy

Hashimoto D., Raj S., Matsui H., Ray S., Sarma D. D., Souma S., Sato T., Takahashi T., Ohishi S., McCarroll W. H., Greenblatt M.

Meeting abstracts of the Physical Society of Japan　59　(2)　629-629　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
12aXC-2 Band structure and Fermi surface of Sb(111) surface studied by ARPES

Sugawara K., Sato T., Souma S., Takahashi T., Arai M., Sasaki T.

Meeting abstracts of the Physical Society of Japan　59　(2)　628-628　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
12aXC-7 Direct observation of band folding induced by charge-density waves in RTe_3 (R=Rare earth) studied by ARPES

Komoda H., Souma S., Sato T., Takahashi T., Ito Y., Suzuki K.

Meeting abstracts of the Physical Society of Japan　59　(2)　629-629　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
12aXC-10 Band Structure and Fermi surface of Na_xWO_3

Raj S., Hashimoto D., Matsui H., Ray S., Sarma D. D., Souma S., Sato T., Takahashi T., Ohishi S., McCarroll W. H., Greenblatt M.

Meeting abstracts of the Physical Society of Japan　59　(2)　630-630　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
12aXC-1 Observation of edge state in kish graphite by high-resolution ARPES

Takahashi T., Sato T., Souma S., Suematsu H.

Meeting abstracts of the Physical Society of Japan　59　(2)　627-627　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
14pRC-4 X-ray angle-resolved photoemission study of AlB_2

Souma S, Iida Y, Sato T, Takahashi T, Kimura N, Aoki H

Meeting abstracts of the Physical Society of Japan　59　(2)　532-532　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
13pRA-11 Angle-resolved photoemission study of Pr_<0.85>LaCe_<0.15>CuO_4

Matsui H, Terashima K, Sato T, Takahashi T, Fujita M, Yamada K

Meeting abstracts of the Physical Society of Japan　59　(2)　492-492　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
13aRD-9 High-resolution ARPES study of Ce_2TIn_8 (T=Co, Rh)

Iida Y, Souma S., Sato T, Takahashi T, Hayakawa T, Ohhara S., Sakamoto I.

Meeting abstracts of the Physical Society of Japan　59　(2)　456-456　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
13aRC-10 Doping dependence of band structure and Fermi surface of Na_xCoO_2 studied by high-resolution ARPES

Sato T, Yang H-B, Wang S-C, Ding H, Souma S, Matsui H, Takahashi T

Meeting abstracts of the Physical Society of Japan　59　(2)　453-453　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
角度分解光電子分光で見た高温超電導体「kink」構造の起源

佐藤宇史, 高橋隆

固体物理　39　(7)　53-62　2004/07
Origin of dispersion kink in high-temperature superconductors studied by ARPES

T. Sato, T. Takahashi

Solid State Physics　39　(7)　469-478　2004/07/01
Publisher: 株式会社アグネ技術センター
28pXE-2 Pseudogap of Nd_<2-x>Ce_xCuO_4 : Angle-resolved photoemission spectroscopy

Matsui H, Terashima K, Sato T, Takahashi T, Ding H., Uefuji T, Yamada K

Meeting abstracts of the Physical Society of Japan　59　(1)　594-594　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pXC-3 High-resolution angle-resolved photoemission study of Na_xCoO_2

Sato T, Yang H -B, Wang S -C, Sekharan A K P, Ding H, Matsui H, Souma S, Takahashi T, Takeuchi T, Campuzano J C, Jin R, Sales B C, Mandrus D, Wang Z

Meeting abstracts of the Physical Society of Japan　59　(1)　589-589　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aXD-7 Superconducting gap of YB_6 : ultrahigh-resolution photoemission spectroscopy

Souma S., Iida Y., Sato T., Takahashi T., Kunii S.

Meeting abstracts of the Physical Society of Japan　59　(1)　644-644　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28pWN-5 Fine electronic structure of kish graphite : Ultrahigh-resoultion ARPES

Takahashi T., Sato T., Souma S., Suematsu H.

Meeting abstracts of the Physical Society of Japan　59　(1)　854-854　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29pXD-15 High-resolution Angle-resolved photoemission study of Ce_2CoIn_8

Iida Y, Souma S, Sato T, Takahashi T, Hayakawa T, Ohhara S, Sakamoto I

Meeting abstracts of the Physical Society of Japan　59　(1)　630-630　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pYD-5 Angle-resolved photoemission study of RTe_3(R=La,Ce)

Komoda H., Souma S., Komatsu H., Sato T., Takahashi T., Ito Y., Suzuki K.

Meeting abstracts of the Physical Society of Japan　59　(1)　801-801　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aXB-8 Electronic structure and superconducting gap of ZrRuP : Ultrahigh-resolution photoemission spectroscopy

Hashimoto D, Matsui H, Souma S, Sato T, Takahashi T, Shirotani I

Meeting abstracts of the Physical Society of Japan　59　(1)　512-512　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aXQ-13 Electronic structure of CeTe_3 and LaTe_3 studied by angle-resolved photoemission spectroscopy

Komatsu H., Souma S., Komoda H., Sato T., Takahashi T., Ito Y., Suzuki K.

Meeting abstracts of the Physical Society of Japan　59　(1)　716-716　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aXQ-12 Band structure and Fermi surface of quasi-1D conductors Nb_3Xc_4(Xc=S,Se,Te) studied by angle-resolved photoemission spectroscopy

Dobashi T., Komatsu H., Sato T., Takahashi T., Ishihara Y.

Meeting abstracts of the Physical Society of Japan　59　(1)　716-716　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Magnetic interaction in Bi-based high-T_c cuprates studied by ARPES

Sato T., Matsui H., Terashima K., Takahashi T., Ding H., Terashima T., Kadowaki K., Fujii T.

Meeting abstracts of the Physical Society of Japan　58　(2)　455-455　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
HR-ARPES study of Co-substituted Bi_2Sr_2CaCu_2O_8

Terashima K., Matsui H., Sato T., Takahashi T., Yamamoto T., Kadowaki K.

Meeting abstracts of the Physical Society of Japan　58　(2)　455-455　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Fermi surface and band structure of (Ce, La)Rh_3B_2 : angle-resolved photoemission spectroscopy

Souma S., Iida Y., Sato T., Takahashi T., Yamada M., Okubo T., Shiromoto T., Inada Y., Settai R., Onuki Y.

Meeting abstracts of the Physical Society of Japan　58　(2)　565-565　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic States and Anti-ferromagnetic Interaction in the Electron-doped high-Tc Superconductor NCCO

Matsui H., Terashima K., Sato T., Takahashi T., Ding H., Uefuji T., Yamada K.

Meeting abstracts of the Physical Society of Japan　58　(2)　562-562　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Angle-resolved photoemission study of Nb_<1-x>Ti_xXc_2 (Xc=S, Se, Te)

Sato T., Komatsu H., Terashima K., Takahashi T., Shimakawa M., Hayashi K.

Meeting abstracts of the Physical Society of Japan　58　(2)　688-688　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic structure of quasi-1D conductor Nb_3X_4 (X=S, Se, Te) studied by angle-resolved photoemission spectroscopy

Komatsu H., Sato T., Takahashi T., Ishihara Y.

Meeting abstracts of the Physical Society of Japan　58　(2)　686-686　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Bulk electronic structure of CaB_6 studied by x-ray ARPES

Souma S., Komatsu H., Matsui H., Sato T., Takahashi T., Muro T., Kimura N., Aoki H., Kunii S., Akimitsu J.

Meeting abstracts of the Physical Society of Japan　58　(2)　635-635　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic structure of Nb_<1-x>Ti_xXc2 (X=S, Se, Te) studied by angle-resolved photoemission spectroscopy

Komatsu H., Sato T., Terashima K., Takahashi T., Shimakawa M., Hayashi K.

Meeting abstracts of the Physical Society of Japan　58　(2)　635-635　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Band dispersion and Fermi surface of 1T-VSe_2 studied by angle-resolved photoemission spectroscopy

Terashima K., Souma S., Sato T., Takahashi T., Maeda N., Hayashi K.

Meeting abstracts of the Physical Society of Japan　58　(2)　635-635　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution angle-resolved photoemission study of RRh_3B_2 (R=La, Ce)

Iida Y., Souma S., Sato T., Yamada M., Okubo T., Shiromoto T., Inada Y., Settai R., Onuki Y.

Meeting abstracts of the Physical Society of Japan　58　(2)　636-636　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Observation of CDW gap in 1T-VSe_2 by angle-resolved photoemission spectroscopy

Terashima K., Sato T., Takahashi T., Maeda N., Hayashi K.

Meeting abstracts of the Physical Society of Japan　58　(1)　745-745　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Direct observation of CDW gap in η-Mo_4O_<11> : Angle-resolved photoemission spectroscopy

Komatsu H., Takahashi N., Sato T., Takahashi T., Koyano M.

Meeting abstracts of the Physical Society of Japan　58　(1)　745-745　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Angle-resolved photoemission study of 1T-VSe_2

Sato T., Terashima K., Takahashi T., Maeda N., Hayashi K

Meeting abstracts of the Physical Society of Japan　58　(1)　696-696　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
"Hidden-1D" Fermi-surface of η-Mo_4O_<11> : Angle-resolved photoemission spectroscopy

Takahashi N., Komatsu H., Sato T., Takahashi T., Koyano M.

Meeting abstracts of the Physical Society of Japan　58　(1)　696-696　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
X-ray angle-resolved photoemission spectroscopy on CaB_6

Souma S., Takahashi T., Komatsu H., Matsui H., Sato T., Muro T., Kimura N., Aoki H., Kunii S., Akimitsu J.

Meeting abstracts of the Physical Society of Japan　58　(1)　402-402　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Many-body interaction in Nd_<2-x>Ce_xCuO_4 : Angle-resolved photoemission spectroscopy

Matsui H., Sato T., Takahashi T., Ding H., Uefuji T., Yamada K.

Meeting abstracts of the Physical Society of Japan　58　(1)　542-542　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution photoemission study of ZrZn_2

Iida Y., Sato T., Takahashi T., Minagawa S., Kimura N., Aoki H.

Meeting abstracts of the Physical Society of Japan　58　(1)　581-581　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Magnetic Interaction Observed by ARPES

Sato T.

Meeting abstracts of the Physical Society of Japan　58　(1)　571-571　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Superconducting gaps of MgB_2 : Angle-resolved photoemission spectroscopy

Souma S, Kakeya I, Sasaki S, Kadowaki K, Machida Y, Takahashi T, Sato T, Matsui H, Wang S. C, Ding H, Kaminski A, Campuzano J. C

Meeting Abstracts of the Physical Society of Japan　58　(0)　491-491　2003
Publisher: The Physical Society of Japan
ISSN： 1342-8349
Direct observation of superconducting quasiparticle in Bi2Sr2Ca2Cu3O10 by high-resolution ARPES

Matsui H., Sato T., Takahashi T., Ding H., Fujii T., Watanabe T., Matsuda A.

Meeting abstracts of the Physical Society of Japan　57　(2)　596-596　2002/08/13
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Photoemission spectroscopy of α- (BEDT-TTF)2MHg(SCN)4 M=(K,NH4)

Komatsu H., Sato T., Takahashi T., Endo S., Toyota N

Meeting abstracts of the Physical Society of Japan　57　(2)　596-596　2002/08/13
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Angle-resolved photoemission spectroscopy of AlB2

Souma S, Sato T, Takahashi T, Kimura N, Aoki H

Meeting abstracts of the Physical Society of Japan　57　(2)　525-525　2002/08/13
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Layer-number dependence of many-body interaction

Matsui H, Sato T, Takahashi T, Terashima T, Kadowaki K, Fujii T, Watanabe T, Matsuda A

Meeting abstracts of the Physical Society of Japan　57　(2)　475-475　2002/08/13
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Anisotropy of dispersion kink in high-Tc cuprate superconductors

Matsui H, Sato T, Takahashi T, Terashima T, Kadowaki K, Fujii T, Watanabe T, Matsuda A

Meeting abstracts of the Physical Society of Japan　57　(2)　474-474　2002/08/13
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Direct observation of Bogoliubov quasiparticle by ARPES

Matsui H, Sato T, Takahashi T, Ding H, Fujii T, Watanabe T, Matsuda A

Meeting abstracts of the Physical Society of Japan　57　(2)　474-474　2002/08/13
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25PYH-5 Fermi surface and superconducting gap of Bi_2Sr_2Ca_2Cu_3O_10+S;High-resolution ARPES

Matsui H., Sato T., Nishina S., Takahashi T., Ding H., Fujii T., Watanabe T., Matsuda A.

Meeting abstracts of the Physical Society of Japan　57　(1)　558-558　2002/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pYH-6 Kink structure in band dispersion of high-T_a superconductors observed by ARPES

Sato T., Nishina S., Matsui H., Ding H., Takahashi T.

Meeting abstracts of the Physical Society of Japan　57　(1)　558-558　2002/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Quasiparticles observed by photoemission spectroscopy

Takafumi Sato, Takashi Takahashi

日本物理学会誌　57　(1)　28-36　2002/01
Publisher: 日本物理学会
DOI： 10.11316/butsuri1946.57.28 　

ISSN： 0029-0181

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The recent remarkable progress in the energy and momentum resolutions in angle-resolved photoemission spectroscopy(ARPES)has been revealing the intriguing nature of quasiparticles(QPs)in high-temperature(T_c)superconductors(HTSCs). It has been found that the lifetime and the energy dispersion of QPs observed by ARPES are closely related to the anomalous physical properties of the HTSCs as well as the mechanism of high-T_c superconductivity. In this article, we review recent ARPES studies on the behavior of QPs in HTSCs and discuss the implications.
High-resolution ARPES of pseudogap in Zn-substituted Bi2212

Nishina S., Sato T., Matsui H., Takahashi T., Ding H., Wang S. -C., Yang H. -B., Hai Do Fuc, Kadowaki K.

Meeting abstracts of the Physical Society of Japan　56　(2)　407-407　2001/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES study of Bi_2Sr_2Ca_2Cu_3O_<10+δ>

Matsui H., Sato T., Nishina S., Takahashi T., Fujii T., Watanabe T., Matsuda A.

Meeting abstracts of the Physical Society of Japan　56　(2)　406-406　2001/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution photoemission study of FeSr_2YCu_2O_<6+δ>

Matsui H., Sato T., Nishina S., Takahashi T., Mihara Y., Hata Y., Kadowaki K.

Meeting abstracts of the Physical Society of Japan　56　(2)　487-487　2001/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Quasiparticles in high-T_c superconductors observed by ARPES : Hole-doping v.s. electron-doping

Sato T., Kamiyama T., Nishina S., Takahashi T., Campuzano J. C., Ding H., Mochiku T., Kadowaki K., Chong I., Terashima T., Takano M., Kurahashi K., Yamada K.

Meeting abstracts of the Physical Society of Japan　56　(1)　466-466　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution ARPES of Zn-substituted Bi2212

Nishina S., Sato T., Kamiyama T., Ding H., Wang S.-C., Yang H.-B., Takahashi T., Hai Do Fuc, Kadowaki K.

Meeting abstracts of the Physical Society of Japan　56　(1)　511-511　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Quasiparticle in Bi2212 : High-resolution ARPES

Sato T., Kamiyama T., Nishina S., Takahashi T., Ding H., Wang S.-C., Yang H.-B., Campuzano J. C., Hai Do Fuc, Kadowaki K.

Meeting abstracts of the Physical Society of Japan　56　(1)　667-667　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Fermi surface of 2-D Mott system BaCo_<1-x>Ni_xS_2 : High-resolution angle-resolved photoemission study

Sato T., Kumigashira H., Ionel D., Naitoh Y., Takahashi T., Hase I., Ding H., Campuzano J. C., Shamoto S.

Meeting abstracts of the Physical Society of Japan　55　(2)　522-522　2000/09/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Fermi surface of Bi2201 by high-resolution ARPES

Kamiyama T., Sato T., Nishina S., Takahashi T., Chong I., Terashima T., Takano M.

Meeting abstracts of the Physical Society of Japan　55　(2)　530-530　2000/09/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Quasiparticles in Bi_2Sr_2Ca_<n-1>Cu_nO_<2n+4+δ> : Ultrahigh-resolution photoemission study

Sato T., Kaminski A., Kamiyama T., Nishina N., Takahashi T., Mesot J., Fretwell H., Campuzano J. C., Norman M. R., Randeria M., Ding H., Hoechst H., Mochiku T., Kadowaki K., Chong I., Terashima T., Takano M.

Meeting abstracts of the Physical Society of Japan　55　(2)　530-530　2000/09/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Ultrahigh-resolution photoemission study the para-to-ferromagnetic phase transition in Co(S,Se)_2

Naitoh Y., Sato T., Kamiyma T., Takahashi T., Hiraka H., Yamada K., Endoh Y., Usuda M., Hamada N.

Meeting abstracts of the Physical Society of Japan　55　(1)　350-350　2000/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Superconducting gap of NCCO : Ultrahigh-resolution angle-resolved photomission study

Sato T., Kamiyama T., Takahashi T., Kurahashi K., Yamada K.

Meeting abstracts of the Physical Society of Japan　55　(1)　542-542　2000/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Superconducting gap, pseudogap, and Fermi surface of Bi2201 : Ultrahigh-resolution angle-resolved photoemission study

Sato T., Kamiyama T., Naitoh Y., Takahashi T., Chong I., Terashima T., Takano M.

Meeting abstracts of the Physical Society of Japan　55　(1)　528-528　2000/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Ultrahigh-resolution angle-resolved photoemission study of superconducting gap of Bi2201 and NCCO

Kamiyama T., Sato T., Naitoh Y., Takahashi T., Chong I., Terashima T., Takano M., Kurahashi K., Yamada K.

Meeting abstracts of the Physical Society of Japan　55　(1)　626-626　2000/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
ここまで来た光電子分光の分解能

高橋隆, 佐藤宇史, 組頭広志

固体物理　35　(5)　346-354　2000/01/01
Publisher: 株式会社アグネ技術センター
24aH-9 Spectral Evidence for c-f hybridization Gap in'Black'SmS Studied by Ultrahigh-Resolution Photoemission

Chainani A, Kumigashira H, Sato T, Nakai T, Takahashi T, Sato N, Suzuki T

Meeting abstracts of the Physical Society of Japan　54　(2)　439-439　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pH-6 Spectral Evidence for c-f hybrifization Gap in Kondo Insulator CePhXp(Xp=Sb, As)Studied by Ultrahigh-Resolution Photoemission(III)

Kumigashira H, Sato T, Takahashi T, Yoshii S, Kasaya M

Meeting abstracts of the Physical Society of Japan　54　(2)　473-473　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24pYD-5 Pseudogap studied by photoemission spectroscopy

Sato Takafumi, Takahashi Takashi

Meeting abstracts of the Physical Society of Japan　54　(2)　480-480　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aJ-3 Direct observation of crstal-field splittng in CeB_6 by ultrahigh-resolution photoemission

Souma S, Sato T, Kamiyama T, Naitoh H, Kumigashira H, Takahashi T, Kunii S

Meeting abstracts of the Physical Society of Japan　54　(2)　541-541　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aYC-4 Ultrahigh-resolution photoemission study of CoS2 across the para-to-ferromagnetic phase transition

Naitoh Y, Sato T, Kamiyama T, Takahashi T, Hiraka K, Yamda K, Endoh Y, Usuda M, Hamada N

Meeting abstracts of the Physical Society of Japan　54　(2)　643-643　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aYR-12 Ultrahigh-resolution photoemission study of ferromagnetic Mott insulator Lu_2V_2O_7

Kamiyama T, Sato T, Naitoh Y, Takahashi T, Tazawa H, Shamoto S, Kajitani T, Hamada N

Meeting abstracts of the Physical Society of Japan　54　(2)　451-451　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
高分解能光電子分光装置の建設と高温超伝導体フェルミ準位微細電子構造

佐藤宇史

物性研究　72　(5)　689-703　1999/08/01
Publisher: 物性研究刊行会
ISSN： 0525-2997
29a-L-4 Ultrahigh-resolution photoemission study of LSCO : temperature dependence

Sato T., Naitoh Y., Yokoya T., Takahashi T., Yamada K.

Meeting abstracts of the Physical Society of Japan　54　(1)　585-585　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
31a-E-8 Ultrahigh-resolution photoemission study of NiS

Naitoh Y., Sato T., Yokoya T., Takahashi T., Onodera M., Yamada K.

Meeting abstracts of the Physical Society of Japan　54　(1)　483-483　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
31p-D-9 Spectral Evidence for Pseudogap Formation in Kondo Insulator CeRhXp(Xp=Sb, As)Studied by Ultrahigh-Resolution Photoemission(II)

Kumigashira H., Sato T., Yokoya T., Takahashi T., Yoshii S., Kasaya M.

Meeting abstracts of the Physical Society of Japan　54　(1)　495-495　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
La_2-2xSr_1+2xMn₂O₇(x=0.32,0.4,0.5)の角度分解光電子分光

竹市信彦, 竹内恒博, MESOT J, DING H, CAMPUZANO J C, MITCHELL J, 佐藤宇史, 高橋隆, 守友浩

日本物理学会講演概要集　54　(1)　544　1999/03/15

ISSN： 1342-8349
光電子分光で見た擬ギャップ(基研研究会「強結合超伝導-Pseudogapを中心として-」,研究会報告)

佐藤宇史, 高橋隆

物性研究　72　(4)　441-443　1999
Publisher: 物性研究刊行会
ISSN： 0525-2997
Bi2212の角度分解光電子スペクトルと(π,π)モード

佐藤宇史, 横谷尚睦, 高橋隆, 竹内恒博, CAMPUZANO J C, 茂筑高士, 門脇和男, GPTASARMA P G, HINKS D G

日本物理学会講演概要集　54　(2)　1999

ISSN： 1342-8349
Bi2212におけるStripeと角度分解光電子分光

佐藤宇史, 横谷尚睦, 竹内恒博, CAMPUZANO J C, DING H, FRETWELL H, MESOT J, 茂筑高士, 門脇和男

日本物理学会講演概要集　54　(2)　1999

ISSN： 1342-8349
Bi2212の超伝導ギャップと磁場侵入長角度分解光電子分光

佐藤宇史, 横谷尚睦, 高橋隆, 竹内恒博, FRETWELL H, KAMINSKI A, CAMPUZANO J C, 茂筑高士, 門脇和男

日本物理学会講演概要集　54　(2)　1999

ISSN： 1342-8349
28p-C-7 ARPES Study of the La_<2-2x>Sr(1+2x)Mn_2O_7(x=0.32, 0.4, 0.5)

Takeichi N, Takahashi T, Moritomo Y, Takeuchi T, Mesot J, Fretwell H, Ksaminshi A, Ding H, Campuzano J.C, Mitchell J, Sato H

Meeting Abstracts of the Physical Society of Japan　54　(0)　544-544　1999
Publisher: The Physical Society of Japan
ISSN： 1342-8349
Ultrahigh-resolution photoemission spectrometer to study the fine electronic structure near the Fermi level

SATO T., NAITOH Y., YOKOYA T., TAKAHASHI T.

Meeting abstracts of the Physical Society of Japan　53　(2)　215-215　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Spectral Evidence of Pseudogap Formation in Kondo Insulators CeRhXp(Xp=Sb,As)Studied by Ultrahigh-Resolution Photoemission(I)

KUMIGASHIRA H., SATO T., YOKOYA T., TAKAHASHI T., YOSHII S., KASAYA M.

Meeting abstracts of the Physical Society of Japan　53　(2)　554-554　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Line shape analysis of high-resolution angle-resolved photoemission spectra in Bi2212

SATO T., YOKOYA T., TAKAHASHI T., DING H., MOSOT J., KAMINSKI A., FRETWELL H., CAMPUZANO J.C., KIMURA K., KATAOKA N., KADOWAKI K., MOCHIKU T., HIRATA K.

Meeting abstracts of the Physical Society of Japan　53　(2)　641-641　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Direct observation of superconducting gap of La_<1.85>Sr_<0.15>CuO_4 by ultrahigh-resolution photoemission spectroscopy

NAITOH Y., SATO Y., YOKOYA T., TAKAHASHI T., YAMADA K.

Meeting abstracts of the Physical Society of Japan　53　(2)　640-640　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
High-resolution angle-resolved photoemission study of Bi2201

SATO T., YOKOYA T., TAKAHASHI T., DING H., FRETWELL H., KAMINSKI A., MOSOT J., CAMPUZANO J.C., CHONG I., TERASHIMA T., TAKANO M.

Meeting abstracts of the Physical Society of Japan　53　(2)　704-704　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Temperature dependence of coherent peak in superconducting Bi2212: ultrahigh-resolution photoemission spectroscopy

YOKOYA T., SATO T., NAITOH Y., TAKAHASHI T., MOCHIKU T., HIRATA K., KIMURA K., KATAOKA N., KADOWAKI K.

Meeting abstracts of the Physical Society of Japan　53　(2)　704-704　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
The XAS and UPS of the SrFeO_<3-δ> accross M-I transition

SATO T., YOKOYA T., CHAINANI A., TAKAHASHI T., KAWASAKI S., TAKANO M., TAKEDA Y.

Meeting abstracts of the Physical Society of Japan　53　(1)　196-196　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
X-ray absorption and photoemission spectroscopy of Ce_<1-x>Sr_xTiO_3

YOKOYA T., SATO T., CHAINANI A., TAKAHASHI T., ONODA M.

Meeting abstracts of the Physical Society of Japan　53　(1)　618-618　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
The superconductiong gap of the Pb-substituted overdoped Bi2212:Angle-resolved photoemissoin spectroscopy

SATO T., YOKOYA T., TAKAHASHI T., CAMPUZANO J.C, CHONG I., TERASHIMA T., HIROI Z., TAKANO M.

Meeting abstracts of the Physical Society of Japan　53　(1)　614-614　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic structure of(La_<1-z>,Nd_z)_<0.46>Sr_<0.54>MnO_3

TAKEUCHI T, DING H, KAMINSKY A, MESOT J, FRETWELL H, YOKOYA T, SATO T, KUMIGASHIRA H, TAKAHASHI T, SHIN S, HIGUCHI T, SODA K, TAKEICHI N, KATO M, YANAGIDA Y, NOMURA T, MIZUTANI U, MORITOMO Y, CAMPUZANO J.C

Meeting Abstracts of the Physical Society of Japan　53　(0)　224-224　1998
Publisher: The Physical Society of Japan
ISSN： 1342-8349
6a-W-8 Angle-resolved photoemission study of Sr_<14-x>Ca_xCu<24>O_<41> : x-dependence

Sato T., Yokoya T., Takahashi T., Goshima J., Fujino Y., Nagata T., Uehara M., Akimitsu J.

Meeting abstracts of the Physical Society of Japan　52　(2)　628-628　1997/09/16
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Sr_xCa_<14-x>Cu_<24>O_<41>角度分解光電子分光 : ドーピング依存性(第42回物性若手夏の学校(1997年度))

佐藤宇史, 横谷尚睦, 高橋隆, 五嶋潤治, 藤野裕一, 永田貴志, 上原政智, 秋光純

物性研究　69　(3)　574-574　1997
Publisher: 物性研究刊行会
ISSN： 0525-2997

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Books and Other Publications 9

放射光顕微ARPESによるTeのエッジ状態観測

中山耕輔, 徳山敦也, 佐藤宇史

表面と真空　2025/05
角度分解光電子分光で見たカゴメ超伝導体の電荷密度波

中山耕輔, 加藤剛臣, 佐藤宇史

固体物理 / アグネ技術センター　2024/08
2次元遷移金属ダイカルコゲナイドの角度分解光電子分光―ダビデの星型秩序相―

菅原克明, 佐藤宇史

固体物理　2023/11
ベイズ推定に基づく角度分解光電子スペクトルの網羅的解析

徳田悟, 中西毅, 佐藤宇史

表面と真空　2023/03/10
角度分解光電子分光で明らかにしたカゴメ超伝導体の極性表面

中山耕輔, 加藤剛臣, 佐藤宇史

表面と真空　2023/01/01
角度分解光電子分光法

佐藤宇史

表面分析ハンドブック (日本表面真空学会編集)　2021/06/01
「X 線光電子分光法」高桑雄二編

佐藤宇史

講談社　2018/12
Angle-Resolved Ultraviolet Photoelectron Spectroscopy

Takafumi Sato

Springer Science　2018/04
ARPESで探る固体の電子構造 -高温超伝導体からトポロジカル絶縁体-

高橋隆, 佐藤宇史

2017/04/22

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Presentations 61

Spatially resolved ARPES study of exotic topological materials, Kyoto, Japan Invited

Takafumi Sato

CREST-EPiQS International Workshop 2024　2024/12/03
Edge states derived from topological helix chains, Seattle, USA Invited

Takafumi Sato

UW-Tohoku Quantum Forum　2024/09/27
Characterization of novel materials by synchrotron-based micro/nano-ARPES, Sendai, Japan

Takafumi Sato

AIMR Intensive Workshop on Energy-Related Materials　2024/08/27
Spatially resolved electronic structure of exotic topological materials, online

Takafumi Sato

FCMP Lecture, Colombia University　2024/04/30
Search for functional 2D materials based on spectroscopies Invited

Takafumi Sato

AOS Quantum Forum and Seminars　2024/03/14
Spatially resolved ARPES study of quantum materials Invited

Takafumi Sato

Distinguished quantum colloquium series, University of Chicago　2024/02/27
高分解能角度分解光電子分光による新機能物質の探索

第３回物構研シンポジウム「サイエンスフェスタ」　2015/03/17
高分解能光電子分光による新機能物質の探索

日本真空学会2014研究例会「次世代放射光における加速器・真空科学と表面分析」　2014/12/03
金属吸着したトポロジカル絶縁体の高分解能ARPES: トポロジカル近接効果

第１７回新学術領域集中連携研究会　2014/07/22
High-resolution ARPES study of novel topological insulators International-presentation

International workshop for young researchers on topological quantum phenomena in condensed matter with broken symmetries 2013　2013/10/22
光電子分光で見た新型トポロジカル物質の電子状態

日本物理学会2013春の年次大会　2013/03/27
ARPES studies of Dirac-cone surface states in topological insulators International-presentation

Indo-Japan conference 2012　2012/10/18
Novel electronic states of topological insulators studied by ARPES International-presentation

Low-Energy Electrodynamics of Solids conference (LEES2012)　2012/07/23
Low-energy excitations of electron- and hole-doped iron-based superconductors studied by high-resolution ARPES International-presentation

International Conference on Spectroscopies in Novel Superconductors (SNS2010)　2010/05/24
Superconducting gap symmetry of iron-based superconductors studied by ARPES International-presentation

8th Asia-Pacific Workshop on Novel Quantum Materials / 2nd Workshop for A3 Foresight Program　2009/07/05
Pairing symmetry of electron- and hole-doped iron-based superconductors studied by high-resolution ARPES International-presentation

International Workshop on the Search for New Superconductors – Frontier and Future –　2009/05/12
LaO(1-x)FxFeAsの高分解能光電子分光

日本物理学会2008年秋の年会　2008/09/20
Superconducting gap and pseudogap of La(O1-xFx)FeAs studied by high-resolution photoemission spectroscopy International-presentation

International Symposium on Fe-Oxipnictide Superconductors　2008/06/28
キセノンプラズマ発光ARPESによる不純物置換Bi2Sr2CaCu2O8の超伝導ギャップ

日本物理学会2008年春の年会　2008/03/24
V族半金属の超高分解能光電子分光

日本物理学会2008年春の年会　2008/03/24
高分解能光電子分光装置の開発と銅酸化物高温超伝導体の電子構造の研究

日本物理学会2008年春の年会　2008/03/24
キセノンプラズマ発光によるBi系高温超伝導体のバルク敏感超高分解能光電子分光

日本物理学会2007秋の年次大会　2007/09/22
キセノンプラズマ発光によるCo(S1-xSex)2のバルク敏感超高分解能光電子分光

日本物理学会2007年秋の年次大会　2007/09/22
Many-body interactions in hole-doped high-Tc cuprates studied by high-resolution ARPES International-presentation

Spectroscopies for Novel Superconductors "SNS2007"　2007/08/20
TlドープPbTe超伝導体の高分解能ARPES

中山耕輔, 高橋隆, 村上博成

日本物理学会2007年春の年会　2007/03/18
Novel electronic states of metal surfaces studied ultrahigh-resolution photoemission

The 5th COE International Symposium　2007/02/14
Electron-boson coupling in high-Tc cuprates studied by ARPES

Workshop on "Anomalous electronic states and physical properties in high-temperature superconductors"　2006/11/08
RAgSb2(R=La, Ce)の高分解能ARPES

日本物理学会2006年秋の分科会　2006/09/23

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荒金俊行、高橋隆、渡部陽平、稲田桂彦
超高分解能光電子分光 -フェルミ面微細電子構造と準粒子-

高橋隆

応用物理学会　2006/08/29
Bogoliubov quasiparticle and low-energy dispersion kink in the superconducting state of La1.85Sr0.15CuO4 International-presentation

K. Terashima, K. Nakayama, T. Takahashi, K. Kadowaki, M. Kofu, K. Hirota

8th International Conference on Materials and Mechanisms of Superconductivity　2006/07/10
NaxCoO2における電子状態のドープ量依存性: 高分解能ARPES

土橋高志, H.-B. Yang, S.-C. Wang, H. Ding, 相馬清吾, 松井浩明, 高橋隆

日本物理学会2005年秋の分科会　2005/09/19
高温超伝導体の超高分解能光電子分光の現状: 準粒子と発現機構

日本物理学会2005年秋の分科会　2005/09/19
高分解能光電子分光で見えてきた準粒子

高橋隆

日本物理学会2004年春の年会　2005/03/27
NaxCoO2における多体相互作用: 高分解能ARPES

土橋高志, H.-B. Yang, S.-C. Wang, H. Ding, 相馬清吾, 松井浩明, 高橋隆

日本物理学会2005年春の年会　2005/03/24
高分解能ARPESによるkish graphiteのedge stateの観測

高橋隆, 相馬清吾, 寿栄松宏仁

日本物理学会2004年秋の分科会　2004/09/12
NaxCoO2のバンド構造とフェルミ面のドープ量依存性: 高分解能ARPES

H.-B. Yang, S.-C. Wang, H. Ding, 相馬清吾, 松井浩明, 高橋隆

日本物理学会2004年秋の分科会　2004/09/10
NaxCoO2の高分解能角度分解光電子分光

H.-B. Yang, S.-C. Wang, A. Sekharan, H. Ding, 松井浩明, 相馬清吾, 高橋隆, 竹内恒博, J. C. Campuzano, R. Jin, B. C. Sales, D. Mandrus, Z. Wang

日本物理学会2004年春の年会　2004/03/28
キッシュグラファイトの微細電子状態: 超高分解能角度分解光電子分光

高橋隆, 相馬清吾, 寿栄松宏仁

日本物理学会2004年春の年会　2004/03/28
層状化合物Nb1-xTixXc2 (Xc=S, Se, Te)の高分解能角度分解光電子分光

小松弘尚, 寺嶋健成, 高橋隆, 嶋川守, 林宏哉

日本物理学会2003年秋の分科会　2003/09/20
Bi系高温超伝導体のARPESスペクトルにおける磁気励起

松井浩明, 寺嶋健成, 高橋隆, H. Ding, 寺嶋孝仁, 門脇和男, 藤井武則

日本物理学会2003年秋の分科会　2003/09/20
光電子分光で見た磁気的相互作用

日本物理学会2003年春の年会　2003/03/29
1T-VSe2の角度分解光電子分光

寺嶋健成, 高橋隆, 前田信祐, 林宏哉

日本物理学会2003年春の年会　2003/03/29
Bi2223におけるBogoliubov準粒子のARPES観測

松井浩明, 高橋隆, H. Ding, 藤井武則, 渡部孝夫, 松田梓

日本物理学会2002年秋の分科会　2002/09/06
角度分解光電子分光による高温超伝導体のバンド分散のkink構造

仁科慎治, 松井浩明, H. Ding, 高橋隆

日本物理学会2002年春の年会　2002/03
高温超伝導体Bi2212の準粒子: 高分解能角度分解光電子分光

神山知之, 仁科慎治, 高橋隆, H. Ding, S.-C. Wang, H.-B. Yang, J, C. Campuzano, D, F. Hai, 門脇和男

日本物理学会2001年春の年会　2001/03
高分解能光電子分光による高温超伝導体の準粒子: ホールドープと電子ドープ

神山知之, 仁科慎治, 高橋隆, J. C. Campuzano, H. Ding, 茂筑高士, 門脇和男, 鄭益秀, 寺島孝仁, 高野幹夫, 倉橋謙磁, 山田和芳

日本物理学会2001年春の年会　2001/03
2次元モット系BaCo1-xNixS2のフェルミ面: 高分解能角度分解光電子分光

組頭広志, D. Ionel, 内藤寧典, 高橋隆, 長谷泉, H. Ding, J, C. Campuzano, 社本真一

日本物理学会2000年秋の年会　2000/09
Bi系高温超伝導体の準粒子ピーク: 超高分解能光電子分光

A. Kaminski, 神山知之, 仁科慎治, 高橋隆, J. Mesot, H. Fretwell, J, C. Campuzano, M, R. Norman, M, Randeria, H. Ding, H. Hoechst, 茂筑高士, 門脇和男, 鄭益秀, 寺島孝仁, 高野幹夫

日本物理学会2000年秋の年会　2000/09
Bi2201の超伝導ギャップ、擬ギャップ、フェルミ面: 超高分解能光電子分光

神山知之, 内藤寧典, 高橋隆, 鄭益秀, 寺島孝仁, 高野幹夫

日本物理学会2000年春の分科会　2000/03
NCCOの超伝導ギャップ: 超高分解能角度分解光電子分光

神山知之, 高橋隆, 倉橋謙磁, 山田和芳

日本物理学会2000年春の分科会　2000/03
Bi2212の角度分解光電子分光: スペクトル形状と(π, π)モード

横谷尚睦, 高橋隆, 竹内恒博, J. C. Campuzano, H. Ding, M. Norman, M, Randeria、H. Fretwell, A. Kaminski, J. Mesot, 茂筑高士, 門脇和男, P. G. Guptasarma, D. G. Hinks, Z. Konstantinovic, Z. Z. Li, H. Raffy

日本物理学会1999年秋の分科会　1999/09
Bi2212の超伝導ギャップと磁場侵入長: 角度分解光電子分光

横谷尚睦, 高橋隆, 竹内恒博, J. Mesot, M. Norman, H. Fretwell, A. Kaminski, J. C. Campuzano, H. Ding, M. Randeria, A. Paramekanti, 茂筑高士, 門脇和男

日本物理学会1999年秋の分科会　1999/09
Bi2212におけるストライプと角度分解光電子分光

横谷尚睦, 高橋隆, 竹内恒博, J. C. Campuzano, H. Ding, H. Fretwell, J. Mesot, A. Kaminski, 茂筑高士, 門脇和男

日本物理学会1999年秋の分科会　1999/09
光電子分光で見た擬ギャップ

高橋隆

日本物理学会1999年秋の分科会　1999/09
LSCOの超高分解能光電子分光: 温度変化

内藤寧典, 横谷尚睦, 高橋隆, 山田和芳

日本物理学会1999年春の年会　1999/03
超高分解能光電子分光装置の建設と強相関電子系フェルミ準位微細電子構造

内藤寧典, 横谷尚陸, 高橋隆

日本物理学会1998年秋の分科会　1998/09
Bi2201の高分解能角度分解光電子分光

横谷尚陸, 高橋隆, H. Ding, H. Fretwell, A. Kaminski, J. Mesot, J. C. Campuzano, 鄭益秀, 寺島孝仁, 高野幹夫

日本物理学会1998年秋の分科会　1998/09
Bi2212の高分解能ARPESスペクトル形状解析

横谷尚陸, 高橋隆, H. Ding, J. Mesot, A. Kaminski, H. Fretwell, J. C. Campuzano, 木村和広, 片岡成樹, 門脇和男, 茂筑高士, 平田和人

日本物理学会1998年秋の分科会　1998/09
Pb置換オーバードープBi2212の超伝導ギャップ：角度分解光電子分光

横谷尚陸, 高橋隆, J. C. Campuzano, 鄭益秀, 寺島孝仁, 廣井善二, 高野幹夫

日本物理学会1998年春の年会　1998/04
SrFeO3-δの金属絶縁体転移のXAS及びUPS

横谷尚睦, A. Chainani, 高橋隆, 川崎修嗣, 高野幹夫, 武田保雄

日本物理学会1998年春の年会　1998/04
Sr14-xCaxCu24O41の角度分解光電子分光:ドーピング依存性

横谷尚陸, 高橋隆, 五嶋潤治, 藤野祐一, 永田貴志, 上原政智, 秋光純

日本物理学会1997年秋の分科会　1997/09

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Research Projects 19

Search for new topological materials by spin-resolved nano-ARPES

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2025/04/01 - 2029/03/31
Search for exotic quasiparticles by angle-resolved photoemission spectroscopy

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2021/04 - 2025/03
ナノスピンARPESによるハイブリッドトポロジカル材料創製

佐藤宇史

System: JST-CREST「トポロジカル材料科学に基づく革新的機能を有する材料・デバイスの創出」

2018/10 - 2024/03
Superconductivity and spin-orbit interaction in atomically thin films studied by ARPES

Sato Takafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2017/04 - 2021/03

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We have investigated new types of atomic-layer materials based on the understanding of energy band structure in the vicinity of the Fermi level responsible for the physical properties, by integrating high-resolution spin-resolved ARPES technique and fabrication of high-quality ultrathin films using molecular-beam epitaxy. In transition-metal dichalcogenides (TMDs), we fabricated some new monolayer compounds and accurately elucidated their unusual electronic states such as the energy gap. We also proposed a new method to control dimensionality of the TMDs. Moreover, we found Dirac electrons in the iron-based-superconductor thin films and hybrid thin films involving topological insulators and Rasha metals, and found that its appearance is governed by a few key parameters such as the spin-orbit interactions and crystal symmetry.
Construction of Topo-Q International Network

Kawakami Norio

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Kyoto University

2015/11/06 - 2020/03/31

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To activate the international exchange of researchers and accelerate the collaborations with overseas research projects on topological materials science, we have played a principal role in establishing the international network dubbed “Topo-Q”. In particular, our original programs such as the alliance workshops have enabled us to host an international platform for the community of researchers working on topological materials science. Furthermore, by fully making use of the researchers exchange programs, we have stimulated the international collaborations and nurtured young researchers.
Administration of Topological Materials Science

Kawakami Norio

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Kyoto University

2015/06/29 - 2020/03/31

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To accomplish the purpose of Topological Materials Science project, we have made a concrete research plan, thereby activating the collaboration among the core projects and also the solicitation projects. To this end, we have held the annual meetings, the international conferences, the topology interactive meetings and the alliance workshops, and have conducted the young researchers programs to establish an interdisciplinary innovative research field. Through these activities, we have put particular emphasis on nurturing young researchers and establishing an international network of collaborations.
Investigation of novel topological phases based on symmetry

Takafumi Sato

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Tohoku University

2015/06 - 2020/03

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We have explored novel topological materials based on crystal symmetry and investigated emergent quantum phenomena and exotic quasiparticles associated with the topological properties of such materials. By combining state-of-the-art bulk-crystal-growth / molecular-beam-epitaxy techniques and advanced spectroscopies such as spin-ARPES and tunneling microscopy, we established controllability of Dirac fermions at the surface and interface of topological insulators. Moreover, we discovered several new types of topological semimetals, as represented by noncentrosymmetric Weyl semimetals, topological semimetals with new chiral fermions, and line-node semimetals protected by the nonsymmorphic symmetries of crystal. We have also conducted experiments on superconducting hybrids/junctions to pin down pairing symmetry, and found several new topological-superconductor candidates. By introducing the concept of topology, new insights in the physics of odd-frequency Cooper pairing were also obtained.
Development of functional ultra-thin film hybrid based on spin-resolved ARPES

Takashi Takahashi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2015/04/01 - 2018/03/31

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We constructed a complex spin-resolved ARPES system with a multi-component MBE system to achieve the following three targets; (1) exploring the electronic structure of novel functional materials, (2) strategic development of advanced new materials based on the determined electronic structure, and (3) creating novel functions by making a hybrid of different materials. Using this ARPES system, we have succeeded in creating several new materials/functions as well as improving their novel properties. Some representative achievements are realization of high-Tc superconductivity in atomically thin FeSe, fabrication of superconducting bilayer graphene with intercalation method, synthesis of trilayer graphene with selecting the stacking sequence and identification of the electronic structure, control and tuning of electronic structure in atomically thin transition-metal dichalcogenide, observation and mass-tuning of Dirac-cone interface states, and discovery of Weyl and nodal-line semimetals.
Fine electronic states of Dirac-electron systems studied by high-resolution ARPES

Sato Takafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2013/04 - 2017/03

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We have developed high-resolution spin-resolved photoemission spectrometer to clarify the relationship between basic electronic states and origin of anomalous physical properties in Dirac electron systems, and have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) studies on graphene-based materials, iron-based superconductors, and topological insulators/semimetals. We have succeeded in (i) controlling the band gap of graphene by surface adsorption, (ii) observing Dirac-cone band in the nematic phase of parent iron-based superconductors, (iii) controlling Dirac-fermion mass at the interface between ultrathin ferromagnet and Rashba metal, and (iv) discovering new types of topological semimetals. From these results, we have clarified close relationship among Dirac-cone electronic states, crystal symmetry, and origin of unconventional physical properties.
Electronic states of novel functional materials studied by ultrahigh-resolution three-dimensional spin- and angle-resolved photoemission spectroscopy

TAKAHASHI Takashi, SATO Takafumi, SOUMA Seigo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2011/04/01 - 2015/03/31

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We have constructed an ultrahigh-resolution three-dimensional spin- and angle-resolved photoemission spectrometer to elucidate the electronic states of novel functional materials such as spintronics-related materials. By developing a three-dimensional spin detector based on the very-low-energy-electron-diffraction method, we have obtained spin-resolved photoemission intensity two-orders-of-magnitude higher than that of the previous spin-resolved system. We have also achieved the energy resolution of 5 meV in the spin-resolved ARPES measurement, which is the world best at present. By using this spin-resolved system as well as synchrotron radiation, we have performed ARPES measurements on novel functional materials such as topological insulators, Rashba metals, and iron-based superconductors. We have succeeded in directly determining the fine electronic states in the vicinity of Fermi level responsible for the anomalous physical properties and novel quantum phenomena.
トポロジカル絶縁体および関連物質のスピン分解ARPES

佐藤宇史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業新学術領域研究(研究領域提案型)

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2013/04 - 2015/03

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本年度は、３次元スピン検出システムの高分解能光電子分光装置への組み込み・調整を行い、スピン分解光電子分光装置の分解能として、ミニモット検出器(8 meV)のエネルギー分解能を上回る5 meVの分解能を達成することに成功した。また、装置の建設・改良と並行して、いくつかのトポロジカル絶縁体およびその関連物質の電子状態の決定を行った。トポロジカル絶縁体の母物質であるビスマス(Bi)において、その表面に残されたアイランドのエッジに起因する１次元的なバンド構造を決定することに初めて成功した。この一次元バンドはラシュバ型のスピン分裂をしており、その分裂幅は二次元的な表面バンドのものよりも遥かに大きいことを見出した。またスピン分解測定の結果、表面に平行なスピン成分とほぼ同程度のスピン垂直成分を観測し、面外だけでなく面内のポテンシャル勾配がエッジにおけるスピンの方向を特徴付けると結論した。また、トポロジカル絶縁体TlBiSe2とラシュバ金属Biの接合系における高分解能スピン分解ARPES実験を行い、フェルミ準位近傍のバンド構造およびフェルミ面を決定した。その結果、Biのバンドとの強いスピン選択的な混成効果によって、TlBiSe2のディラックコーン電子状態が大きく変調されることを見出した。このことから、もともとTlBiSe2側に存在していたトポロジカル表面状態が、接合によって金属(Bi)側に移動する「トポロジカル近接効果」という新しい現象が発現していると結論した。
高分解能スピン分解ＡＲＰＥＳによるトポロジカル絶縁体における微細電子構造の研究

佐藤宇史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業新学術領域研究(研究領域提案型)

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2011/04 - 2013/03

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スピン分解光電子分光装置のエネルギー分解能を向上するために、高輝度低エネルギー紫外光を発生する励起光源系と、光電子のスピン情報を得るスピン分解ミニモット検出器の最終調整を行った。建設改良を行ったスピン分解光電子分光装置および高輝度放射光施設を用いて、IV-VI族半導体SnTeのARPES実験を行った結果、SnTeのトポロジカル電子状態は、表面ブリルアンゾーンにおいて(110)鏡映面に中心を持つ「二重ディラック錐」表面状態で特徴付けられることが明らかになった。このディラック錐構造は、Bi2Se3などの典型的なトポロジカル絶縁体が1個のディラック錐を有するのとは異なり、トポロジカル的に明確に区別される。得られた観測結果が、理論的に提案された「トポロジカルクリスタル絶縁体」の電子状態と非常に類似していることから、SnTeではトポロジカルクリスタル相が実現していると結論した。一方で、同じ結晶構造のPbTeでは、表面状態が全く観測されず、Pb1-xSnxTe固溶系におけるトポロジカル量子相転移の発現を示唆した。また、トポロジカル絶縁体Bi2Se3層の間にPbSe層を挟んだヘテロ構造を有するバルク物質(PbSe)5(Bi2Se3)3m (m = 1, 2, ∞)の電子状態をARPESで調べた結果、ディラック錐の形状がBi2Se3の層数mに依存して劇的に変化することを見出した。このことから、トポロジカル絶縁体におけるディラック電子の質量獲得には、バルクにおけるヘテロ構造の制御が有効であると結論した。本研究全体を総括し、トポロジカル物質の物性解明やデバイス応用のためには、ディラックコーンに質量を付与しそのキャリア濃度の調整をすることが本質的に重要で、かつ、スピンに依存した電子状態を高精度で決定する事がそれらの問題の解決に直結していると結論した。
Bulk electronic states of high-Tc cuprate superconductors studied by high-resolution angle-resolved photoemission spectroscopy

SATO Takafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2009 - 2012

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We have constructed low-energy ultrahigh-resolution photoemission spectrometer to elucidate the bulk electronic states in the vicinity of the Fermi level in high-temperature cuprate superconductors, and have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) studies of cuprates and related materials. We have found an existence of two different types of pseudogaps above superconducting transition temperature in single- and multi-layered Bi-based cuprates by the systematic temperature- and momentum-dependent ARPES measurements. In addition, we have clarified the electronic states of related materials, such as cobalt oxides and iron-based superconductors, and revealed characteristic similarities/dissimilarities among these superconductors, which are a key to the deeper understanding of the mechanism of high-temperature superconductivity.
Interrelation between charge- and spin-density modulation in high-Tc superconductors

HIRAKA Haruhiro, MATSUMURA Daiju, WAKIMOTO Syuichi, KUDO Kazutaka, SATO Takafumi, KADONO Ryosuke, YAMADA Kazuyoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2007 - 2008
超高分解能角度分解光電子分光装置の建設と水和コバルト酸化物超伝導機構の研究

佐藤宇史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業若手研究(A)

Category: 若手研究(A)

Institution: 東北大学

2005 - 2007

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水和コバルト酸化物超伝導体の超伝導発現機構を解明する目的で、高分解能光電子分光装置の建設・改良を行った。本装置および高輝度放射光施設を用いて、Na_<0.5>CoO_2における金属-絶縁体転移の起源を明らかにするために、高分解能角度分解光電子分光の精密な運動量および温度依存性の測定を行った。その結果、絶縁相においてエネルギーギャップを観測する事に成功し、そのギャップが強く波数に依存性して異方的である事を見出した。また、温度変化測定の結果、金属-絶縁体転移温度である50Kよりも遥かに高温からギャップが形成されていることがわかった。これらの実験結果から、エネルギーギャップの形成には磁性転移が密接に関係していると結論した。また、K(H)点におけるeg'フェルミ面の欠如がバルクの電子状態に普遍的なものかどうかを明らかにするために、低エネルギー光を用いた高分解能光電子分光を行った結果、20-100eVの紫外線を用いた実験と同様にeg'バンドはフェルミ準位に到達せず、K(H)点近傍のフェルミ面は存在しない事を明らかにした。さらに、コバルト酸化物の研究比較として、銅酸化物La系超伝導体の高分解能光電子分光測定を行った。その結果、超伝導状態におけるエネルギーギャップの測定に成功し、ギャップ形状が理論的に予想されるd_<x^2-y^2>波対称性から大きく逸脱していることを明らかにした。さらに、超伝導転移温度よりも上の温度において擬ギャップを観測し、その波数依存性が超伝導状態におけるアンチノードのエネルギーギャップと類似している事を見出した。これらの事から、擬ギャップと超伝導ギャップが密接に関係していると結論した。
単層カーボンナノチューブの超高分解能光電子分光

佐藤宇史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽研究

Category: 萌芽研究

Institution: 東北大学

2004 - 2006

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単層カーボンナノチューブのフェルミ準位近傍の微細電子状態を決定する目的で、高分解能高電子分光装置の改良・調整を行った。具体的には、一体型電子衝撃高温加熱機構の改良・調整を行い、高温に耐えられるTa型試料基板の製作を行った。さらに、超高真空中でアルカリ金属をインターカレーションするための蒸着装置の設計・製作を行った。半金属Sb(111)試料を用いてCaの蒸着実験を行い、蒸着前後で表面バンドのエネルギー位置と形状に顕著な違いが見られることを見出した。このことから、実際に試料表面にCaが蒸着され、試料表面にキャリアーがドープされていることを確認した。ナノチューブの基本構造となる一枚層のグラファイト(グラフェン)を育成する目的で、試料作成槽に新たに通電加熱機構を設計・製作し、半導体表面の清浄化を可能にした。この装置を用いて、シリコンカーバイド(SiC)を1200°C以上に加熱してCを表面に析出させることにより、超高真空中で良質なグラフェンを育成することに成功した。ナノチューブの異常な電子状態と構造との関係を明らかにするために、ナノチューブ構造のベースとなるグラファイト単結晶の超高分解能光電子分光を行い、スペクトル形状の定量解析を行った。その結果、結合エネルギー0.2eV以上における準粒子の寿命が、典型的なフェルミ流体から大きく逸脱していることを見出した。また、フェルミ準位近傍において準粒子バンドに折れ曲がり(kink)構造が見られ、エネルギー位置がバルクのデバイ温度と良く対応していることから、その起源が強い電子格子相互作用に由来すると結論した。以上の事から、ナノチューブを始めとするすべてのグラファイト関連物質において、強い電子格子相互作用が異常物性に大きく影響していると結論した。
Development of ultrahigh-resolution photoemission spectrometer and study of quasiparticles in high-temperature superconductors

TAKAHASHI Takashi, SATO Takafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2002 - 2005

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In order to clarify the origin of quasiparticles in high-temperature superconductors, we have constructed a new ultrahigh-resolution angle-resolved photoemission (ARPES) spectrometer at Tohoku University. The spectrometer consists of (1) electron-energy analyzer, (2) light source, (3) analysis chamber, and (4) sample preparation chamber. As for the analyzer, we have improved the electric stability of the hemispherical part and the electron lens system, and also performed accurate sensitivity calibration of the CCD camera and the two-dimensional photoelectron detector. As for the light source, we have constructed a double differential pumping system as well as a VUV-filter which can pass ultraviolet-ray from the He discharge lamp but completely blocks residual gasses from the lamp. As for the sample chamber, we have developed a variable-angle manipulator which can rotate the angle with respect to the analyzer at low temperature. To effectively perform the ARPES experiment, we have developed a sample transfer system around the sample preparation chamber. To improve the vacuum during the measurement and to achieve low temperature, we have constructed multi-wall radiation shields with He-cycling cryostat. By making these efforts, we have finally achieved high performances as follows : (1) energy resolution : 1.3meV, (2) momentum resolution : 0.005Å^<-1>, (3) lowest temperature : 3.7K, and (4) vacuum during measurements : 2x10^<-11>Torr. By using this ultrahigh-resolution spectrometer, we have performed high-resolution ARPES measurements on following subjects. 1)Observation of Fermi surface, superconducting gap, and pseudogap in Bi-based high-temperature superconductors. 2)Direct observation of Bogoliubov quasiparticles on a triple-layered superconductor Bi2223. 3)Elucidation of the origin of kink in the dispersion in hole-doped high-temperature superconductors. 4)Direct observation of multiple-superconducting gaps in MgB_2. 5)Observation of magnetic isotope effect in energy dispersion of Bi-based high-temperature superconductors. 6)Direct observation of nonmonotonic d_x2_<-y2> wave superconducting gap in electron-doped high-temperature superconductors.
超高分解能光電子分光装置の建設と高温超伝導体フェルミ準位微細電子構造の研究

佐藤宇史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2002 - 2004

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東北大学において、新型超高分解能角度分解光電子分光装置の建設を行った。具体的には、極低温化のために、2重の極低温ラディエーションシールドの設計・取り付けを行った。また、エネルギー分解能向上のために、ミューメタルシールド試料槽の設計・取り付けを行い、低磁場下での測定を実現した。さらに、電源系・測定系の改良の結果、気体Xeの測定において、1.5meVという超高分解能を達成した。超高分解能光電子分光装置、及び米国ウィスコンシン州放射光施設を用いて、単位格子中に含まれるCuO_2面の数(n)を1から3まで系統的に変化させてホールドープ型Bi系高温超伝導体の角度分解光電子分光を行った。その結果、n=2,3の両物質において、超伝導状態で、フェルミ準位近傍における強い多体相互作用の存在を示すバンド分散の折れ曲がり構造(kink構造)を観測することに成功した。また、このkink構造は、超伝導転移温度以上では消失し、かつブリルアンゾーン中の(π,0)点近傍の波数領域で強く観測されることが分かった。さらに、このようなkinkの波数・温度依存性は、n=1のBi系高温超伝導体では観測されないことを見出した。これらの事から、ホール型高温超伝導体における準粒子の形成には、Q=(π,π)の波数をもつ磁気的共鳴モードが強く影響していると結論した。また、電子ドープ型Nd系高温超伝導体の角度分解光電子分光を行い、ホール型と同様、kinkの強い波数依存性と温度変化を観測した。以上の実験事実から、高温超伝導機構には磁気的相互作用が密接に関係していると結論した。
超高分解能光電子分光装置の建設と高温超伝導体フェルミ準位微細電子構造の研究

佐藤宇史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

1999 - 2001

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Social Activities 56

模擬講義 (秋田南高校)

2017/06/20 -

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量子力学と超伝導の説明や、液体窒素を用いた高温超伝導体の磁気浮上実験
東北大学理学部キャンパスツアー「ぶらりがく」

2016/11/05 -

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超伝導と磁石の説明や、液体窒素を用いた超伝導体の磁気浮上実験
出前授業(岩手県水沢高校)

2014/09/17 -

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岩手県立水沢高校において、電子と超伝導についての講義を行う。
東北大学見学会(群馬県高崎高校)

2013/09/04 -

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東北大学において、群馬県高崎高校の生徒への講義、超伝導の実験、および研究室見学を行う。
東北大学理学部ガイダンス(秋田高校)

2013/06/19 -

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秋田高校において、東北大学理学部の説明、受験情報の紹介などを行う。
サイエンスパートナーシッププロジェクト(秋田県立横手高校)

2012/08/10 -

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東北大学において、秋田県横手高校理数科の生徒と超伝導の実験を行う。
サイエンスパートナーシッププロジェクト(秋田県立横手高校)

2012/07/23 -

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東北大学において、秋田県横手高校理数科の生徒と超伝導の実験を行う。
半導体と金属の境界で巨大なラシュバ効果

2012/04/27 -
トポロジカル絶縁体の新性質ディラック電子に質量を付与

2011/11/25 -
電子の重さ変わる材料省エネ素子開発に期待

2011/08/22 -
サイエンスパートナーシッププロジェクト(秋田県立横手高校)

2011/08/03 -

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東北大学において、秋田県横手高校理数科の生徒と超伝導の実験を行う。
サイエンスパートナーシッププロジェクト(秋田県立横手高校)

2011/07/23 -

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秋田県立横手高校において超伝導と環境に関する講義を行う
鉄系高温超伝導体の超伝導阻害要因発見

2011/07/22 -
鉄系超電導材臨界温度更新の可能性

2011/07/14 -
注目集めるトポロジカル絶縁体電子スピンを直接観察

2011/05/27 -
トポロジカル絶縁体電子スピンの動作解明

2011/05/18 -
サイエンスパートナーシッププロジェクト(神奈川県藤沢清流高校)

2010/11/19 -

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神奈川県藤沢清流高等学校において大学模擬講義を行う
鉄系高温超伝導体の超伝導機構東北大グループ統一的な理解に成功

2010/11/05 -
鉄化合物の超電導物質 5種に共通の仕組み

2010/11/02 -
出前授業(仙台二華高校)

2010/10/26 -

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仙台二華高校において、電子と超伝導についての講義を行う。
表面は通電室温で安定「トポロジカル絶縁体」新型発見

2010/10/11 -
セメントが電気を通す機構東北大、東工大の研究グループ解明

2010/10/08 -
東北大グループセメント金属化仕組み解明

2010/10/04 -
最大のバンドギャップ持つトポロジカル絶縁体を発見

2010/10/01 -
電気を通す透明なセメント結晶の穴に電子が入る

2010/09/29 -
セメント電子材料へ改良東北大など変化の過程を解明

2010/09/28 -
大学模擬講義 (秋田県立横手高等学校)

2010/09/01 -

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秋田県立横手高等学校において大学模擬講義を行う
電子質量「ゼロ」の物質東北大発見超高速素子に応用

2010/03/29 -
宮城県宮城野高校土曜ゼミナール講師

2009/12/05 -

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宮城県宮城野高校において土曜ゼミナールの講師を行った
大学模擬講義 (秋田県立横手高等学校)

2009/09/02 -

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秋田県立横手高等学校で大学模擬講義を行った
鉄系超電導の産業応用に光発現型2種性質は共通

2009/05/03 -
鉄系高温超伝導体の電子型・ホール型で共通の対称性を発見

2009/04/24 -
鉄含む高温超電導物質電子がペア組み発生

2009/04/17 -
鉄系高温超伝導体電子型・ホール型で共通の対称性を発見

2009/04/08 -
鉄系超伝導体東北大が機構解明

2009/04/07 -
黒鉛超伝導体40年来の難問を解決カルシウム挿入黒鉛光電子分光法で観測

2008/11/14 -
黒鉛の超電導体メカニズム解明

2008/11/14 -
黒鉛系の超電導物質新たに電子の通り道鉄系等解明も

2008/11/13 -
黒鉛カルシウム化合物低温超電導仕組み解明

2008/11/10 -
黒鉛にカルシウム超伝導に東北大チーム謎を解明

2008/11/10 -
黒鉛超伝導「層間電子状態」を確認３０年の論争に決着

2008/11/10 -
鉄系高温超伝導体の超伝導電子対、対称性の決定に成功、機構解明に向けて大きく前進

2008/08/01 -
鉄を含む新型高温超伝導体超伝導電子を直接観測

2008/06/27 -
鉄系超電導電子を観測転移高温化も

2008/06/10 -
鉄の電子、超電導を阻害せず。常識を覆した

2008/06/10 -
材料中の電子状態、５倍深く観察、キセノン使う新装置

2007/12/27 -
キセノンプラズマ放電管開発, 新機能物質内部を解明

2007/12/27 -
大学模擬講義 (秋田県立横手高等学校)

2007/09/05 -

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理学部を志望する横手高等学校の二年生を対象にして、大学模擬講義を行い、実験等のデモンストレーションを行った。
銅酸化物高温超伝導体「擬ギャップ状態」の起源同定

2006/07/07 -

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高温超伝導体では、温度を下げて超伝導に至る前の温度で、"擬ギャップ状態"とよばれる常伝導でも超伝導でもない奇妙な金属状態が出現するが、この現象がなぜおこるのかについては、研究者の間を二分する大きな論争となっていた。東北大学のグループは、擬ギャップ状態の"起源"を同定する事に成功した。今後、超伝導メカニズムの解明に道を開くものとして注目される。
超電導「前触れ」解明

2006/07/02 -
常温との中間"擬ギャップ状態" 超伝導に変わる前触れ、東北大など解明

2006/06/30 -
高温超電導の直前現象解明

2006/06/26 -
磁石の性質高温超伝導に関与

2005/12/26 -
電子の磁石の性質が鍵、高温超伝導体で東北大グループ

2005/12/26 -
高温超伝導電子のスピンが鍵

2005/12/26 -
電子が持つ磁石の性質高温超伝導に関与

2005/12/26 -

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Media Coverage 31

バルクでは磁石につかない物質を原子層厚の薄膜で磁石に変換

日経新聞(WEB)

2025/04/18

Type: Newspaper, magazine
量子コンピューターへの応用期待東北大など「トポロジカル絶縁体」の新物質発見

河北新報

2024/06/06
トポロジカルなキラル量子細線を発見

日経新聞(WEB)

2024/06
微小ドメインを分割したディラック電子状態観測による反強磁性トポロジカル絶縁体の実証

日経新聞(WEB)

2023/11
東北大、原子層を重ねた「モアレ模様」の活用で新構造の原子層結晶を創製

日経新聞(WEB)

2023/10/25
東北大、二次元物質の電荷配列現象に新たな機構「高次ネスティングベクトル」の関与を発見

日経新聞(WEB)

2023/05/08

Type: Newspaper, magazine
マイクロメートルサイズの微小な粉状結晶の電子構造測定に初めて成功 ─次世代半導体開発や微粒子の物性解明のブレークスルーに

日経新聞(WEB)

2023/03/02

Type: Newspaper, magazine
カゴメ格子超伝導を担う電子軌道を解明 -- 放射光を用いた先端電子計測で照らし出す

日経新聞(WEB)

2022/11/14

Type: Newspaper, magazine
東北大など、熱や光などの刺激に強い原子層モット絶縁体を発見

日経新聞(WEB)

2021/10/07

Type: Newspaper, magazine
電子構造の全貌明らかにベイズ推定応用の解析法

化学工業日報

2021/07/29
東北大・九大・JSTなど、ベイズ推定を用いた電子構造の解析法を開発

日経新聞 (WEB)

2021/07/27

Type: Newspaper, magazine
電子質量０に見える物質東北大が発見

2016/05/13

Type: Newspaper, magazine

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日経産業新聞
「ワイル半金属」を発見

化学工業日報

2016/04/28

Type: Newspaper, magazine
電子の移動 10倍速い材料

日経産業新聞

2016/02/17

Type: Newspaper, magazine
相対論的電子を発生巨大な質量付与成功

科学新聞

2016/01/22

Type: Newspaper, magazine
超高速コンピューターへ「血の巡りが良い」新素材

日本経済新聞

2016/01/15

Type: Newspaper, magazine
原子レベルの超薄膜で高温超伝導を発現・制御

科学新聞

2015/06/12

Type: Newspaper, magazine
極薄の金属膜で超電導消費電力ゼロ集積回路へ可能性

河北新報

2015/06/05

Type: Newspaper, magazine
超電導極薄の膜, 鉄化合物厚さ原子3個

日経産業新聞

2015/06/05

Type: Newspaper, magazine
高温超伝導体作成に成功

日刊工業新聞

2015/06/02

Type: Newspaper, magazine
シート状炭素分子グラフェンカルシウム加え半導体に

日経産業新聞

2015/04/10

Type: Newspaper, magazine
グラフェン電子制御

日刊工業新聞

2015/04/10

Type: Newspaper, magazine
2層グラフェン層間化合物東北大の研究グループ作製に成功

科学新聞

2012/11/23

Type: Newspaper, magazine
極薄グラフェンサンドイッチ構造電池高性能に道

日経産業新聞

2012/11/06

Type: Newspaper, magazine
グラフェン層間化合物金属原子挟み作製

日刊工業新聞

2012/11/06

Type: Newspaper, magazine
リチウム原子挟む化合物作成に成功

日本経済新聞

2012/11/06

Type: Newspaper, magazine
新種のトポロジカル物質発見

科学新聞

2012/10/16

Type: Newspaper, magazine
科学新聞

科学新聞

2011/11/23

Type: Newspaper, magazine
平成21年度科学技術分野の文部科学大臣表彰

河北新報

2009/04/07

Type: Newspaper, magazine
山下太郎顕彰育英会 4人1団体に奨励賞を授与

秋田魁新報

2007/06/09

Type: Newspaper, magazine
山下太郎顕彰育英会研究奨励賞に3人

秋田魁新報

2007/05/29

Type: Newspaper, magazine

Show all Show first 5

Academic Activities 4

The 8th Symposium for the Core Research Clusters for Materials Science and Spintronics and the 7th Symposium on International Joint Graduate Program in Materials Science and Spintronics, Sendai, Japan

2024/11/18 - 2024/11/20

Activity type: Competition, symposium, etc.
The 7th Symposium for the Core Research Clusters for Materials Science and Spintronics and the 6th Symposium on International Joint Graduate Program in Materials Science and Spintronics, , Sendai, Japan

2023/11/28 - 2023/12/01

Activity type: Competition, symposium, etc.
University of Washington - Tohoku University Quantum Materials Workshop, Sendai, Japan

2025/06/10 -

Activity type: Competition, symposium, etc.
AOS Quantum Forum and Seminars, Sendai, Japan

2024/03/14 -

Activity type: Competition, symposium, etc.

Other 2

角度分解光電子分光による新型トポロジカル絶縁体の基盤電子構造の解明 (三菱財団自然科学研究助成)

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高分解能角度分解光電子分光(ARPES)により、新型トポロジカル絶縁体におけるフェルミ準位近傍の基盤電子構造の解明を行う。
高分解能ARPESによる鉄系高温超伝導体の微細電子構造の研究

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本研究では、超高分解能角度分解光電子分光(ARPES)法を用いて鉄系高温超伝導体の電子状態を精密に決定することによって、その高温超伝導発現機構を解明することを目的とする。これを実現するために、現有の超高分解能光電子分光装置の励起光源系の改良を行い、1meV以下の精度の超高分解能ARPES実験を可能にする。改良した装置を用いて鉄系超伝導体単結晶のフェルミ面、エネルギーバンド分散、準粒子、超伝導ギャップ、および擬ギャップを直接観測する事により、フェルミ準位(EF)近傍の微細電子構造と超伝導発現機構との関係を明らかにする。電子ドープ型RFeAsO1-xFx(R:希土類)およびホールドープ型(A,K)Fe2As2(A:アルカリ土類金属)単結晶の両方について系統的なARPES実験を行うことによって、鉄系超伝導体の高温超伝導メカニズムを総合的に解明する。「超高分解能ARPESによる鉄系超伝導体の電子状態の解明」は、更に高い超伝導転移温度(Tc)を目指した物質探索の指針を与えると同時に、新たな超伝導デバイスの開発にも大きく貢献する事が期待される。