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Kosuke Nakayama

Section

Graduate School of Science

Job title

Assistant Professor

Degree

博士(理学) (Tohoku University)

researchmap

https://researchmap.jp/7000000405

J-GLOBAL ID

201201024443939288

Professional Memberships 3

American Physical Society
日本放射光学会
日本物理学会

Research Interests 5

光電子分光
電子状態
高温超伝導体
トポロジカル物質
低次元物質

Research Areas 1

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

Awards 5

APS Outstanding Referee

2020/03　American Physical Society
第28回山下太郎学術研究奨励賞

2017/06/09　一般財団法人山下太郎顕彰育英会
平成28年度科学技術分野の文部科学大臣表彰若手科学者賞

2016/04/20　文部科学省
第10回日本物理学会若手奨励賞

2016/03/21　日本物理学会
井上研究奨励賞

2012/02/04　井上科学振興財団

Papers 157

Origin of multiple skyrmion phases in EuAl4

Yuki Arai, Kosuke Nakayama, Asuka Honma, Seigo Souma, Daisuke Shiga, Hiroshi Kumigashira, Takashi Takahashi, Kouji Segawa, Takafumi Sato

Nature Communications　2026/04/13

DOI： 10.1038/s41467-026-71020-y 　
Spin-degenerate bulk bands and topological surface states associated with Dirac nodal lines in RuO2

Takumi Osumi, Kunihiko Yamauchi, Seigo Souma, Shubhankar Paul, Asuka Honma, Kosuke Nakayama, Kenichi Ozawa, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Chiara Bigi, François Bertran, Tamio Oguchi, Takashi Takahashi, Yoshiteru Maeno, Takafumi Sato

Physical Review B　2026/02/10

DOI： 10.1103/wvs6-hqfv 　
Extracting causality from spectroscopy

K. Fujita, K. Nakayama, Y. Fujiki, T. Kato, H. Suito, H. Higuchi, T. Sato

Scientific Reports　15　(1)　2025/12/22
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-025-29687-8 　

eISSN： 2045-2322

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Abstract Causality represents a directed relationship where one state, designated as a cause, directly produces or partially influences another state, an effect. Identifying causality in observations of physical phenomena is a core challenge in science, as it reveals the fundamental laws governing these observations. However, extracting causal relationships from complex data remains difficult. While recent advances in machine learning offer promising avenues, a definitive guiding principle for its application for causal inference has yet to emerge. Here, we propose a protocol to analyze spectroscopy data using DirectLiNGAM, one of statistical causal inferences for learning a Linear Non-Gaussian Acyclic Model. We applied this approach to spatially resolved core-level photoemission spectroscopy measurements of the kagome superconductor CsV₃Sb₅. Our analysis uncovered intriguing causal relationships among Cs surface coverage, core-level intensity/position, and the spectral background. These findings provide an explanation for the polar surface formation in CsV₃Sb₅ and, furthermore, reveal an unexpected causal link in the intensity of spin-orbit satellite peaks. These results highlight the potential of our method to reveal new physical laws that would be difficult to identify using conventional data analysis techniques.
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　205111　2025/05/08

DOI： 10.1103/PhysRevB.111.205111 　
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　3448　2025/04/18

DOI： 10.1038/s41467-025-58643-3 　
(Review Article) Photoemission Insights to Electronic Orders in Kagome Superconductor AV3Sb5

Yigui Zhong, Jia-Xin Yin, Kosuke Nakayama

Journal of the Physical Society of Japan　93　111001　2024/11/15

DOI： 10.7566/JPSJ.93.111001 　
Ferromagnetism triggered by band tripling in ruthenate Sr4Ru3O10

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　155134　2024/10/15

DOI： 10.1103/PhysRevB.110.155134 　
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　165104　2024/10/01

DOI： 10.1103/PhysRevB.110.165104 　
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　115152　2024/09/26

DOI： 10.1103/PhysRevB.110.115152 　
In-situ topotactic chemical reaction for spectroscopies

Tappei Kawakami, Kosuke Nakayama, Katsuaki Sugawara, Takafumi Sato

Electronic Structure　6　033001　2024/09/01

DOI： 10.1088/2516-1075/ad5acb 　
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　631　54-59　2024/06/05
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41586-024-07484-z 　

ISSN： 0028-0836

eISSN： 1476-4687
Quasi‐Homoepitaxial Growth of Highly Strained Alkali‐Metal Ultrathin Films on Kagome Superconductors Peer-reviewed

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

Advanced Science　11　2309003-1-8　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.
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)　115102-1-8　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)　7396-1-8　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　10　2304461-1-7　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 TiTe2

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)　104002-1-7　2023/10/18
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevmaterials.7.104002 　

eISSN： 2475-9953
Unusual surface states associated with PT-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)　115118-1-10　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)　L100501-1-7　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)　245143-1-15　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)　023152-1-7　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)　35-1-9　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.
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
Development of Ar gas cluster ion beam system for surface preparation in angle-resolved photoemission spectroscopy

Atsuya Tokuyama, Ayumi Moriya, Kosuke Nakayama

Review of Scientific Instruments　94　(2)　2023/02/01
Publisher: AIP Publishing
DOI： 10.1063/5.0100610 　

ISSN： 0034-6748

eISSN： 1089-7623

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Gas cluster ion beam (GCIB) sputtering has a high potential for obtaining clean and flat surfaces on materials without causing structural or compositional damage. We have developed an Ar cluster GCIB system for surface preparation in angle-resolved photoemission spectroscopy (ARPES). The constructed GCIB system is compatible with ultrahigh vacuum and achieves a beam current of 10 µA. We examined the usefulness of our GCIB system for high surface-sensitive ARPES measurements by applying it to several representative materials, e.g., Sb, GaAs, and Te. The results show that the constructed GCIB system is very useful for preparing a clean flat surface on crystals, widening opportunities for precise ARPES measurements for materials whose crystal surfaces or orientations are hardly obtained by a simple cleaving method.
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
Three-dimensional energy gap and origin of charge-density wave in kagome superconductor KV3Sb5 Peer-reviewed

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)　30　2022/12/11
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.
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
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
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
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)　033906　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 Peer-reviewed

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

Physical Review X　12　(1)　011001　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 XMg2Bi2 (X = Ba and Sr) Peer-reviewed

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)　21937　2021/11/09

DOI： 10.1038/s41598-021-01333-z 　

eISSN： 2045-2322
Multiple energy scales and anisotropic energy gap in the charge-density-wave phase of the kagome superconductor CsV3Sb5 Peer-reviewed

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

Physical Review B　104　(16)　L161112　2021/10/21
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.104.l161112 　

ISSN： 2469-9950

eISSN： 2469-9969
Pb/Bi heterostructure as a versatile platform to realize topological superconductivity Peer-reviewed

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)　04A103　2021/08/04
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.
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)　L012007　2021/01/20
Publisher: American Physical Society (APS)
DOI： 10.1103/PhysRevResearch.3.L012007 　

eISSN： 2643-1564
Signature of band inversion in the antiferromagnetic phase of axion insulator candidate EuIn2As2 Peer-reviewed

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)　033342　2020/09/01

DOI： 10.1103/physrevresearch.2.033342 　

eISSN： 2643-1564
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)　159　2020/07/06
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.102.041104 　

ISSN： 2469-9950

eISSN： 2469-9969
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　11　159　2020/01/09
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-019-13946-0 　

eISSN： 2041-1723
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
Evidence for bulk nodal loops and universality of Dirac-node arc surface states in ZrGeXc (X-c = S, Se, Te) Peer-reviewed

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

PHYSICAL REVIEW B　99　(24)　2019/06/04

DOI： 10.1103/PhysRevB.99.245105 　

ISSN： 2469-9950
Monolayer VTe2: Incommensurate Fermi surface nesting and suppression of charge density waves Peer-reviewed

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

PHYSICAL REVIEW B　99　(24)　241404(R)　2019/06

DOI： 10.1103/PhysRevB.99.241404 　

ISSN： 2469-9950
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 Charge and Associated Fermi-Arc Surface States in CoSi Peer-reviewed

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

PHYSICAL REVIEW LETTERS　122　(7)　2019/02/20

DOI： 10.1103/PhysRevLett.122.076402 　

ISSN： 0031-9007
Ultrathin Bismuth Film on High-Temperature Cuprate Superconductor Bi2Sr2CaCu2O8+delta as a Candidate of a Topological Superconductor Peer-reviewed

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

ACS NANO　12　(11)　10977-10983　2018/11

DOI： 10.1021/acsnano.8b04869 　

ISSN： 1936-0851

eISSN： 1936-086X
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
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
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
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
Two-dimensional Dirac semimetal phase in undoped one-monolayer FeSe film Peer-reviewed

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

PHYSICAL REVIEW B　96　(22)　2017/12

DOI： 10.1103/PhysRevB.96.220509 　

ISSN： 2469-9950

eISSN： 2469-9969
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)　2017/07/26

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)　041120　2017/07

DOI： 10.1103/PhysRevB.96.041120 　

ISSN： 2469-9950

eISSN： 2469-9969
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　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 　
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　2016/09

DOI： 10.1103/PhysRevB.94.121108 　

ISSN： 2469-9950

eISSN： 2469-9969
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　2016/06

DOI： 10.1103/PhysRevB.93.241103 　

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　(SI)　40-42　2016/04

DOI： 10.1016/j.elspec.2015.04.009 　

ISSN： 0368-2048

eISSN： 1873-2526
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)　161112　2016/04

DOI： 10.1103/PhysRevB.93.161112 　

ISSN： 2469-9950

eISSN： 2469-9969
21pBQ-2 High-temperature superconductivity in atomically thin FeSe films

Nakayama Kosuke

Meeting Abstracts of the Physical Society of Japan　71　2326-2327　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_2326 　

ISSN： 2189-079X
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
21aBL-4 ARPES study of iron-based high-temperature superconductors

Nakayama Kosuke

Meeting Abstracts of the Physical Society of Japan　71　2172-2173　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_2172 　

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
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
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 　
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 　
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 　
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)　100508　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
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　2015/05

DOI： 10.1103/PhysRevB.91.195114 　

ISSN： 1098-0121

eISSN： 1550-235X
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
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
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
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　2014/12

DOI： 10.1103/PhysRevLett.113.237001 　

ISSN： 0031-9007

eISSN： 1079-7114
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)　140506　2014/04

DOI： 10.1103/PhysRevB.89.140506 　

ISSN： 1098-0121

eISSN： 1550-235X
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)　220508　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
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)　094513　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
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
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
Angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo1.73Fe0.27B2 Peer-reviewed

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

PHYSICAL REVIEW B　86　(1)　014503　2012/07

DOI： 10.1103/PhysRevB.86.014503 　

ISSN： 1098-0121
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　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　2012/03

DOI： 10.1103/PhysRevB.85.125111 　

ISSN： 1098-0121
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　2012/03

DOI： 10.1103/PhysRevLett.108.116801 　

ISSN： 0031-9007
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　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　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 Peer-reviewed

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
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
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)　064519　2011/08

DOI： 10.1103/PhysRevB.84.064519 　

ISSN： 1098-0121
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　2011/07

DOI： 10.1038/ncomms1394 　

ISSN： 2041-1723
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　2011/06

DOI： 10.1103/PhysRevB.83.224509 　

ISSN： 1098-0121
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　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)　140513　2011/04

DOI： 10.1103/PhysRevB.83.140513 　

ISSN： 1098-0121
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　2011/03

DOI： 10.1103/PhysRevB.83.094522 　

ISSN： 1098-0121
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　2011/01

DOI： 10.1103/PhysRevB.83.020501 　

ISSN： 1098-0121
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　(1 SI)　S129-S131　2010/12

DOI： 10.1016/j.physc.2010.01.001 　

ISSN： 0921-4534
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　(1 SI)　S394-S396　2010/12

DOI： 10.1016/j.physc.2009.11.137 　

ISSN： 0921-4534
High-resolution ARPES study of electron-doped Fe-based superconductor BaFe(1.85)Co(0.15)AS(2) 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-SUPERCONDUCTIVITY AND ITS APPLICATIONS　470　(1 SI)　S440-S442　2010/12

DOI： 10.1016/j.physc.2009.11.129 　

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　2010/11

DOI： 10.1103/PhysRevLett.105.197001 　

ISSN： 0031-9007
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
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　2010/04

DOI： 10.1103/PhysRevLett.104.137001 　

ISSN： 0031-9007
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
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　140503(R)　2009/05
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)　140503　2009/04

DOI： 10.1103/PhysRevB.79.140503 　

ISSN： 2469-9950

eISSN： 2469-9969
Superconducting gap symmetry of Ba0.6K0.4Fe2As2 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　2009/03

DOI： 10.1209/0295-5075/85/67002 　

ISSN： 0295-5075
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
Electronic structure of heavily electron-doped BaFe1.7Co0.3As2 studied by angle-resolved photoemission 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
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
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
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
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　65-68　2008/11

DOI： 10.1143/JPSJS.77SC.65 　

ISSN： 0031-9015
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)　100502　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　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　2008/06

DOI： 10.1103/PhysRevLett.100.227004 　

ISSN： 0031-9007
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　2008/03

DOI： 10.1103/PhysRevB.77.092501 　

ISSN： 2469-9950

eISSN： 2469-9969
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　2008

DOI： 10.1209/0295-5075/83/47001 　

ISSN： 0295-5075
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　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
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　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　(Part 2)　862-863　2007/09

DOI： 10.1016/j.physc.2007.03.155 　

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　(Part 2)　931-933　2007/09

DOI： 10.1016/j.physc.2007.03.328 　

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
Bogoliubov quasiparticle and low-energy dispersion kink in the superconducting state of La(1.85)Sr(0.15)CuO(4) Peer-reviewed

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

Physica C　460-462　862-863　2007/03/27
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　2007/01

DOI： 10.1103/PhysRevB.75.014513 　

ISSN： 2469-9950

eISSN： 2469-9969
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　2006/08

DOI： 10.1103/PhysRevB.74.054505 　

ISSN： 2469-9950

eISSN： 2469-9969

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Misc. 156

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

日本物理学会講演概要集(CD-ROM)　79　(2)　2024

ISSN： 2189-079X
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

日本物理学会講演概要集(CD-ROM)　79　(1)　2024

ISSN： 2189-079X
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

ISSN： 2189-079X
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

日本物理学会講演概要集(CD-ROM)　79　(1)　2024

ISSN： 2189-079X
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

日本物理学会講演概要集(CD-ROM)　79　(1)　2024

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 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
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
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
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
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
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
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
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
FeSe原子層薄膜

中山耕輔

固体物理特集号超伝導の新しい潮流　41　163-173　2016/11/15
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
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.
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
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
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
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
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
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
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
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
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
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
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-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
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-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-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
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
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
Dirac electrons and pseudogap in iron-based superconductors studied by ARPES

47　(3)　121-127　2012/03
Publisher: アグネ技術センター
ISSN： 0454-4544
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)　21-27　2012/03
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
23aGL-6 ARPES study of pseudogap in cuprates

Nakayama Kosuke

Meeting abstracts of the Physical Society of Japan　66　(2)　572-572　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
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
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
高分解能角度分解光電子分光でみ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　(2)　2011/08
Publisher: 高エネルギー加速器研究機構
28aEJ-6 ARPES study of pseudogap in cuprates(Recent Progresses on HTSC)

Nakayama Kosuke

Meeting abstracts of the Physical Society of Japan　66　(1)　676-676　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
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
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
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
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
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
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
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
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
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-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
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
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
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で見た高温超伝導体YBa2Cu3O7-dのバルク・表面電子状態

中山耕輔, 佐藤宇史, 高橋隆

PHOTON FACTORY NEWS　26　(2)　14-17　2008/08
Publisher: 高エネルギー加速器研究機構
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
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
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
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
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
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
Bulk and surface low-energy excitations in YBa2Cu3O7-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

Phys. Rev. B　75　(1)　014513　2007

DOI： 10.1103/PhysRevB.75.014513 　

ISSN： 1098-0121
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
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
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
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
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
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-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
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
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

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Books and Other Publications 1

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 [編]　2024/08

Presentations 55

高分解能ARPESで見るカゴメ超伝導体の電子状態 Invited

中山耕輔

量子ビームサイエンスフェスタ　2025/03/13
Observation of edge states derived from topological Te chains Invited

Kosuke Nakayama

The 12th Vacuum and Surface Sciences Conference of Asia and Australia (VASSCAA-12), Taipei, Taiwan　2024/10/17
放射光顕微ARPESによるTeの一次元エッジ状態観測 Invited

中山耕輔

PF研究会「放射光顕微分光が切り拓く材料研究のフロンティア」　2024/10/03
Electronic structure of topological kagome metals Invited

Kosuke Nakayama

Workshop on physics and electronics of 2D doped materials, Tateshina, Japan　2024/06/12
Electronic structure of kagome superconductors AV3Sb5 studied by ARPES Invited

Kosuke Nakayama

The 36th International Symposium on Superconductivity (ISS2023), Wellington, New Zealand　2023/11/28
High-spatial-resolution ARPES study of kagome superconductors Invited

Kosuke Nakayama

The 41st International Conference on Vacuum Ultraviolet and X-ray Physics (VUVX 2023), Campinas-SP, Brazil　2023/07/04
FeSeの半金属的バンド構造：高分解能ARPES

日本物理学会第73回年次大会　2018/03/25
Te単結晶におけるバンド分裂とワイルノードの直接観測：高分解能ARPES

第31回日本放射光学会年会　2018/01/10
FeSe薄膜の高分解能ARPES

高温超伝導フォーラム第5回会合　2017/09/25
High-resolution ARPES study of trigonal tellurium International-presentation

Internation Conference on Topological Materilas Science 2017　2017/05/09
Te単結晶薄膜の高分解能ARPES

日本物理学会第72回年次大会　2017/03/17
Electronic Structure of Iron-Based High-Tc Superconductors International-presentation

The 29th International Superconductivity Symposium (ISS 2016)　2016/12/13
角度分解光電子分光で見たFeSe超薄膜の高温超伝導

第59回化合物新磁性材料専門研究会　2016/12/05
新規トポロジカル超伝導体候補物質Tl0.5Bi2Te3のフェルミオロジー

UVSORシンポジウム2016　2016/10/29
Electronic states of FeSe thin films on SrTiO3 International-presentation

International Symposium on Revolutionary Atomic-Layer Materials　2016/10/21
FeSe/SrTiO3の高分解能ARPES

高温超伝導フォーラム　2016/09/12
角度分解光電子分光による鉄系高温超伝導体の研究

日本物理学会第71回年次大会　2016/03/19
FeSe原子層薄膜における高温超伝導

日本物理学会第71回年次大会　2016/03/19
Electronic phase diagram of atomically thin FeSe films on SrTiO3 International-presentation

International Workshop on Superconductivity and Related Functional Materials 2016　2016/03/17
High-Tc superconductivity in potassium-coated FeSe thin films International-presentation

Mini-workshop on oxides and related materials　2016/02/24
High-Tc superconductivity in multilayer FeSe films seen via high-resolution ARPES International-presentation

CEMS Topical Meeting on Emergent 2D Materials　2015/12/11
鉄系超伝導体におけるディラック電子

第5回トポロジー集中連携研究会「ワイル半金属・超伝導」　2015/11/06
トポロジカル超伝導体候補物質Cux(PbSe)5(Bi2Se3)6の高分解能ARPES

日本物理学会2015年秋季大会　2015/09/16
K吸着したFeSe多層膜における高温超伝導：高分解能ARPES

日本物理学会2015年秋季大会　2015/09/16
High-temperature superconductivity in atomically thin multilayer FeSe films on SrTiO3 International-presentation

Materials and Mechanisms of Superconductivity 2015　2015/08/23
Electronic nematicity and unconventional superconductivity in FeSe International-presentation

Materials and Mechanisms of Superconductivity 2015　2015/08/23
FeSe超薄膜の高分解能ARPES

日本物理学会第70回年次大会　2015/03/21
鉄系超伝導体FeSeにおける電子ネマティック状態と超伝導

駒場物性セミナー　2015/01/23
鉄カルコゲナイド超伝導体の高分解能ARPES

第28回日本放射光学会年会　2015/01/10
FeSe単結晶の高分解能ARPES

日本物理学会秋季大会　2014/09/07
FeSe薄膜の電子状態：高分解能ARPES

日本物理学会第69回年次大会　2014/03/27
NaFeAs系超伝導体の高分解能ARPES

日本物理学会秋季大会　2013/09/25
High-resolution ARPES study of iron-based superconductors International-presentation

Superconductivity research advanced by new materials and spectroscopies　2013/07/23
Evolution of low-energy electronic states in an iron-chalcogenide superconductor studied by high-resolution ARPES International-presentation

Spectroscopies of novel superconductors 2013　2013/06/24
高分解能ARPESによる新型トポロジカル物質の研究

東京大学物性研究所放射光セミナー　2013/06/11
トポロジカル絶縁体のバルクへテロ構造制御によるディラックコーンの操作

日本物理学会第68回年次大会　2013/03/26
オーバードープBa1-xKxFe2As2の超伝導ギャップ：高分解能ARPES

日本物理学会秋季大会　2012/09/18
Low-energy electronic excitations in iron-based superconductors studied by ARPES: Importance of antiferromagnetic interactions International-presentation

WPI-AIMR Mini Workshop "A route to high Tc superconductivity"　2012/09/03
Direct observation of anisotropic SC gaps in LiFeAs International-presentation

Materials and mechanisms of superconductivity 2012　2012/07/29
鉄系超伝導体の超伝導ギャップ対称性:高分解能ARPES

UVSOR研究会「UVSOR-IIIにおける低エネルギー光電子分光の新展開」　2012/06/21
Fermi surface topology and superconducting gap symmetry in iron-based superconductors studied by high-resolution ARPES International-presentation

2012 ENERGY MATERIALS NANOTECHNOLOGY MEETING　2012/04/16
LiFeAsにおける超伝導ギャップの異方性：高分解能ARPES

日本物理学会第67回年次大会　2012/03/24
新規鉄系高温超伝導体の電子状態:高分解能ARPES

第25回日本放射光学会年会　2012/01/06
Fe(Te,Se)超伝導体における準粒子ピーク：高分解能ARPES

日本物理学会秋季大会　2011/09/21
ARPESから見た擬ギャップ

日本物理学会秋季大会　2011/09/21
Superconducting gap and pseudogap inFe-based uspercondutors International-presentation

Search for new physics in transition metal compounds by spectroscopies　2011/07/28
Direct observation of superconducting gap in iron-based superconductors International-presentation

International workshop on strong correlations and angle-resolved photoemission spectroscopy (CORPES11)　2011/07/18
新型鉄系高温超伝導体の高分解能ARPES

第28回PFシンポジウム　2011/07/12
LaFe2P2の高分解能ARPES

日本物理学会第66回年次大会　2011/03/25
オーバードープBa0.3K0.7Fe2As2の高分解能ARPES

日本物理学会秋季大会　2010/09/23
Evidence for the precursor pairing above Tc in Bi2Sr2CuO6 revealed by ultrahigh-resolution ARPES International-presentation

International conference on spectroscopies in novel superconductors (SNS2010)　2010/05/24
Low-energy electronic structure of Ba1-xKxFe2As2 and FeTe1-xSex superconductors studied by high-resolution ARPES International-presentation

International conference on spectroscopies in novel superconductors (SNS2010)　2010/05/24
Sr2VO3FeAsの高分解能ARPES

日本物理学会第65回年次大会　2010/03/20
Fermi surface and superconducting gap of FeTe1-xSex superconductor studied by high-resolution ARPES International-presentation

American Physical Society March Meeting 2010　2010/03/15
鉄系超伝導体の高分解能ARPES

第27回PFシンポジウム　2010/03/09

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Research Projects 10

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
新奇二次元トポロジカル絶縁体相の開拓

中山耕輔

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的研究(萌芽)

Institution: 東北大学

2024/06/28 - 2027/03/31
超高分解能マイクロARPESによるカゴメ超伝導体の電子状態イメージング

中山耕輔

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2024/04 - 2026/03
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

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2021/04/05 - 2025/03/31
カルコゲナイド原子層薄膜のトポタクティック合成と新奇物性開拓

中山耕輔

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2020/04/01 - 2023/03/31

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S蒸着源を備えたトポタクティック反応装置を新たに設計・製作してMBE装置にドッキング、調整を行った。トポタクティック反応装置については、バリアブルリークバルブによるS蒸着レートの精密な制御、通電加熱機構による薄膜の加熱、耐腐食性材料を用いた各部の浸食の抑制、多段ポンプによる超高真空化を実現した。これにより、各種の薄膜試料に対してトポタクティック反応を促すための基盤が整った。また、高分解能ARPES装置の希ガスプラズマ放電管の光学系を改良し、集光用の中空ガラスキャピラリ型レンズを導入することで、ビームスポットの微小化に取り組んだ。また、差動排気システムの強化も同時に実現することでARPES測定時の真空度の向上を達成した。以上の建設・改良した装置を用いることで、鉄系高温超伝導体FeCh (Ch = S, Se, Te)薄膜の高分解能ARPES測定を行い、電子状態のカルコゲン濃度依存性を系統的に決定した。その結果、電子ネマティック秩序や超伝導転移温度の組成依存性を理解する上で、Fe 3d軌道に依存したバンドのエネルギーシフトと状態密度の変化を考慮する必要があることを見出した。また、超伝導転移温度を跨いだ準粒子バンド分散の変化を高精度で決定することで、波数に依存しない単純なs波的超伝導状態から逸脱する振る舞いを見出した。トポロジカル絶縁体薄膜に対してもS照射を行い、トポタクティック反応を実現するための条件を見出すことに成功した。新物質の物性解明に向けて、高分解能ARPES測定を行い、基本的なバンド構造を決定した。
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

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2017/04/01 - 2021/03/31

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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.
High-temperature superconductivity in FeSe films studied by angle-resolved photoemission spectroscopy

Nakayama Kosuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (A)

Institution: Tohoku University

2017/04/01 - 2020/03/31

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We have investigated the superconducting mechanism in ultrathin iron-based superconductors and also searched for high-temperature superconductivity. By improving an angle-resolved photoemission spectrometer and a molecular-beam epitaxy system, we have grown ultrathin films of iron-based superconductors with various compositions, carrier concentrations, and thicknesses. By determing their superconducting temperatures and electronic structures, we have succeeded in achieving high-temperature superconductivity, determining the phase diagram, and uncovering exotic properties. Our detailed ARPES studies provide important insights into the mechanism of high-temperature superconductivity.
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.
Angle-resolved photoemission spectroscopy study of superconducting mechanism and electronic phase diagram in iron-based superconductors

NAKAYAMA Kosuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2012/04/01 - 2015/03/31

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In order to clarify the superconducting mechanism of iron-based superconductors, we have improved an ultrahigh-resolution photoemission spectrometer. By using this apparatus, we have performed systematic photoemission spectroscopy study of the electronic structure in various iron-based superconductors. The obtained results suggest an important role of spin fluctuations for the superconductivity. Our results also provide new insights into the electronic phase diagrams of iron-based superconductors. Besides performing photoemission, we have fabricated thin films of iron selenide and succeeded in converting non-superconducting multilayer films into high-temperature superconductors as a consequence of successful electron doping.
低エネルギー超高分解能光電子分光装置の建設と高温超伝導体の微細電子構造の研究

中山耕輔

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

2007 - 2009

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これまで建設・改良を進めてきた超高分解能光電子分光装置を用いて、銅酸化物および鉄系高温超伝導体の電子状態の研究を行った。銅酸化物高温超伝導体Bi_2Sr_2CuO_6の超伝導・擬ギャップの温度・波数依存性を高精度で決定し、超伝導ギャップから擬ギャップへの変化が、超伝導転移温度をまたいで連続的に起こることを見出した。また、擬ギャップの消失する温度は波数によらず超伝導ギャップサイズに比例することを明らかにした。これらの結果は、長年の未解決問題であった擬ギャップの起源が、超伝導の前駆現象に関係することを示している。超伝導機構が未解明である電子型鉄系超伝導体BaFe_<2-x>Co_xAs_2のフェルミ面および超伝導ギャップを世界で初めて直接観測することに成功し、超伝導対称性がs波であること、および反強磁性ベクトルで繋がれるフェルミ面上で超伝導ギャップサイズが増大していることを見出した。これらの結果は、高温超伝導が反強磁性揺らぎによって生じていることを示している。また、ホール型Ba_<1-x>K_xFe_2As_2の結果と比較を行うことで、電子型とホール型の両者で超伝導機構が共通である「電子-ホール対称性」が成り立っていることを実験的に示した。さらに、結晶構造の異なるFeTe_<1-x>Se_x超伝導体のフェルミ面と超伝導ギャップを高分解能ARPESによって決定することに初めて成功し、反強磁性揺らぎにもとづく超伝導機構が鉄系高温超伝導体において普遍的に実現していることを示唆した。

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Social Activities 27

電子質量0に見える物質

2016/05/13 -
「ワイル半金属」を発見

2016/04/28 -
原子レベルの超薄膜で高温超伝導を発現・制御

2015/06/12 -
超電導極薄の膜

2015/06/05 -
極薄の金属膜で超電導

2015/06/05 -
高温超伝導体作成に成功

2015/06/02 -
高温超伝導担う電子異常な秩序状態形成

2014/12/19 -
新種のトポロジカル物質東北大グループ発見

2012/10/26 -
サイエンス・パートナーシップ・プロジェクト(秋田県立横手高等学校)

2012/08/10 -

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超伝導について高校生に講義および模擬実験を行う
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 -
電子の重さ変わる新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(秋田県立横手高等学校)

2011/08/03 -

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東北大学において大学模擬講義を行う(副講師)
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 -
鉄系高温超伝導体の超伝導機構東北大グループ統一理解に成功

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 -
鉄系高温超伝導体でディラックコーン状態確認

2010/04/09 -
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 -
鉄系超電導の産業応用に光

2009/05/03 -
鉄系高温超伝導体の電子・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 -
鉄系高温超電導体電子・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 -
鉄系高温超伝導体の超伝導電子対対称性の決定に成功

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 -
鉄の電子超電導阻害せず

2008/06/10 -
鉄系超電導電子を観測

2008/06/10 -

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Other 1

原子層鉄系超伝導体のキャリア制御と高温超伝導探索

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原子層鉄系超伝導体のキャリア制御と高温超伝導探索