Details of the Researcher

PHOTO

Katsuaki Sugawara
Section
Graduate School of Science
Job title
Associate Professor
Degree

  • 博士（理学）（東北大学）

  • 修士（理学）（東北大学）

Research History 6

  • 2024/10 - Present
    Japan Science and Technology Agency

  • 2020/12 - 2024/03
    Japan Science and Technology Agency

  • 2017/04 - 2022/03
    Tohoku University　Center for Spintronics Research Network

  • 2010/04 - 2017/03
    東北大学 原子分子材料科学高等研究機構　助教

  • 2009/04 - 2010/03
    東北大学 原子分子材料科学高等研究機構　助手

  • 2008/04 - 2009/03
    日本学術振興会特別研究員(DC2)

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Committee Memberships 2

  • 日本物理学会　領域７運営委員

    2018/10 - 2019/10

  • 日本物理学会　領域４運営委員

    2016/10 - 2017/10

Professional Memberships 3

  • 日本放射光学会

  • 応用物理学会

  • 日本物理学会

Research Interests 3

  • 表面

  • 原子層

  • 光電子分光

Research Areas 3

  • Nanotechnology/Materials / Nanostructure physics /

  • Nanotechnology/Materials / Nanostructure chemistry /

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

Awards 12

  1. 第20回インテリジェント・コスモス奨励賞

    2021/04　インテリジェント・コスモス学術振興財団

  2. ディスティングイッシュ・リサーチャー

    2020/04　東北大学

  3. 2018年度「貴金属に関わる研究助成金」萌芽賞

    2019/03　田中貴金属記念財団

  4. 平成30年度科学技術分野の文部科学大臣表彰 若手科学者賞

    2018/04　文部科学省　グラフェンおよび関連原子層物質の研究

  5. 第二回薄膜・表面物理分科会 論文賞

    2018/03　応用物理学会 薄膜・表面物理分科会

  6. 第38回 本多記念研究奨励賞

    2017/05/29　公益財団法人 本多記念会

  7. 第27回トーキン科学技術賞

    2017/03/08　公益財団法人 トーキン科学技術振興財団

  8. 東北大学 研究所若手アンサンブルワークショップポスター賞

    2016/07/12　東北大学

  9. 第9回 日本物理学会若手奨励賞

    2015/03/21　一般社団法人 日本物理学会

  10. 第1回 ATI 研究奨励賞

    2014/07/18　公益財団法人 新世代研究所

  11. 第52回原田研究奨励賞

    2012/07/06　公益財団法人 本多記念会

  12. 物理学専攻賞

    2009/02　東北大学

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Papers 104

  1. Ultrafast relaxation dynamics and nonequilibrium processes in graphite

    Hao-Hsiang Jia, Yuki Nakata, Seigo Souma, Katsuaki Sugawara, Yang-Hao Chan, Cheng-Maw Cheng, Ming-Chang Chen, Takafumi Sato, Chih-Wei Luo, Ashish Chainani, Ping-Hui Lin

    Physical Review B　2025/05/28

    DOI： 10.1103/PhysRevB.111.195430 　

  2. 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　2025/05/08

    DOI： 10.1103/PhysRevB.111.205111 　

  3. 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　2025/04/18

    DOI： 10.1038/s41467-025-58643-3 　

  4. Experimental verification of terahertz surface plasmon resonance using the Dirac electron system Bi2SexTe(3-x)

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

    Optical Materials Express　2025/04/01

    DOI： 10.1364/OME.553139 　

  5. Role of spin–orbit coupling for the band splitting in α-Sb and α-Bi on SiC(0001)

    Ken Yaegashi, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato

    Journal of Physics: Condensed Matter　2025/03/31

    DOI： 10.1088/1361-648X/ada981 　

  6. Giant Rashba splitting in PtTe/PtTe2 heterostructure

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

    Nature Communications　2025/03/18

    DOI： 10.1038/s41467-025-57835-1 　

  7. Unusual temperature dependence of the band structure associated with local atomic distortion in monolayer 1T′-WTe2

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

    Physical Review Materials　2025/01/23

    DOI： 10.1103/PhysRevMaterials.9.L011001 　

  8. In-situ topotactic chemical reaction for spectroscopies

    Tappei Kawakami, Kosuke Nakayama, Katsuaki Sugawara, Takafumi Sato

    Electronic Structure　2024/09/01

    DOI： 10.1088/2516-1075/ad5acb 　

  9. Selective Fabrication of Monolayer 1H- and 1T′-WTe2

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

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

    DOI： 10.7566/JPSJ.93.085002 　

  10. Observation of edge states derived from topological helix chains

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

    Nature　2024/06/05

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41586-024-07484-z 　

    ISSN： 0028-0836

    eISSN： 1476-4687

  11. 180 °-twisted bilayer ReSe2 as an artificial noncentrosymmetric semiconductor Peer-reviewed

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

    Physical Review Research　6　L022048　2024/06/03

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.6.l022048 　

    eISSN： 2643-1564

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

  12. Quasi‐Homoepitaxial Growth of Highly Strained Alkali‐Metal Ultrathin Films on Kagome Superconductors

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

    Advanced Science　2024/06/03

    Publisher: Wiley

    DOI： 10.1002/advs.202309003 　

    ISSN： 2198-3844

    eISSN： 2198-3844

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

  13. マイクロARPESによる粉状層状半導体r-BSの電子状態観測 Invited

    菅原克明, 相馬清吾, 近藤剛弘, 佐藤宇史

    Photon Factory News　41　18-22　2024

  14. 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　2023/11/17

    DOI： 10.1038/s41467-023-42782-6 　

  15. ２次元遷移金属ダイカルコゲナイドの角度分解光電子分光―ダビデの星型秩序相― Peer-reviewed

    菅原克明, 佐藤宇史

    固体物理　58　623　2023/11

  16. Moiré‐Assisted Realization of Octahedral MoTe2 Monolayer

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

    Advanced Science　2023/10/22

    Publisher: Wiley

    DOI： 10.1002/advs.202304461 　

    ISSN： 2198-3844

    eISSN： 2198-3844

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    Abstract A current key challenge in 2D materials is the realization of emergent quantum phenomena in hetero structures via controlling the moiré potential created by the periodicity mismatch between adjacent layers, as highlighted by the discovery of superconductivity in twisted bilayer graphene. Generally, the lattice structure of the original host material remains unchanged even after the moiré superlattice is formed. However, much less attention is paid for the possibility that the moiré potential can also modify the original crystal structure itself. Here, it is demonstrated that octahedral MoTe2 which is unstable in bulk is stabilized in a commensurate MoTe2/graphene hetero‐bilayer due to the moiré potential created between the two layers. It is found that the reconstruction of electronic states via the moiré potential is responsible for this stabilization, as evidenced by the energy‐gap opening at the Fermi level observed by angle‐resolved photoemission and scanning tunneling spectroscopies. The present results provide a fresh approach to realize novel 2D quantum phases by utilizing the moiré potential.

  17. 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)　2023/10/18

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevmaterials.7.104002 　

    eISSN： 2475-9953

  18. 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　2023/05/02

    DOI： 10.1038/s41699-023-00395-z 　

  19. 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

  20. 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

  21. Selective Fabrication of Bismuthene and α-Bi on Hydrogen-Terminated SiC(0001)

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

    Langmuir　38　(44)　13401-13406　2022/10/28

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.langmuir.2c01678 　

    ISSN： 0743-7463

    eISSN： 1520-5827

  22. Coexistence of Urbach‐Tail‐Like Localized States and Metallic Conduction Channels in Nitrogen‐Doped 3D Curved Graphene

    By Yoichi Tanabe, Yoshikazu Ito, Katsuaki Sugawara, Samuel Jeong, Tatsuhiko Ohto, Tomohiko Nishiuchi, Naoaki Kawada, Shojiro Kimura, Christopher Florencio Aleman, Takashi Takahashi, Motoko Kotani, Mingwei Chen

    Advanced Materials　2205986-2205986　2022/10/08

    Publisher: Wiley

    DOI： 10.1002/adma.202205986 　

    ISSN： 0935-9648

    eISSN： 1521-4095

  23. 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

  24. Pb/Bi heterostructure as a versatile platform to realize topological superconductivity

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

    Progress of Theoretical and Experimental Physics　2022　(4)　2022/04/07

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/ptep/ptab105 　

    eISSN： 2050-3911

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

  25. Development of a versatile micro-focused angle-resolved photoemission spectroscopy system with Kirkpatrick-Baez mirror optics

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

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

    DOI： 10.1063/5.0074393 　

    ISSN： 0034-6748

    eISSN： 1089-7623

  26. Visualization of band structure in a powdered crystal by micro-focused ARPES Invited

    Photon Factory News　2022　6-7　2022

  27. Dirac semimetal phase and switching of band inversion in XMg<inf>2</inf>Bi<inf>2</inf> (X = Ba and Sr)

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

    Scientific Reports　11　(1)　2021/12

    DOI： 10.1038/s41598-021-01333-z 　

    eISSN： 2045-2322

  28. Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2

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

    NATURE COMMUNICATIONS　12　(1)　2021/10

    DOI： 10.1038/s41467-021-26105-1 　

    eISSN： 2041-1723

  29. Electronic states of multilayer VTe2 : Quasi-one-dimensional Fermi surface and implications for charge density waves

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

    Physical Review B　104　(4)　2021/07/23

    DOI： 10.1103/PhysRevB.104.045136 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  30. Manipulation of Dirac Cone in Topological Insulator/Topological Insulator Heterostructure

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

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

    Publisher: American Chemical Society ({ACS})

    DOI： 10.1021/acsaelm.0c00918 　

    ISSN： 2637-6113

    eISSN： 2637-6113

  31. Highly Tunable Near‐Room Temperature Ferromagnetism in Cr‐Doped Layered Td‐WTe 2

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

    Advanced Functional Materials　31　(13)　2008116-2008116　2021/03

    Publisher: Wiley

    DOI： 10.1002/adfm.202008116 　

    ISSN： 1616-3028

    eISSN： 1616-3028

  32. 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 　

    ISSN： 2073-8994

    eISSN： 2073-8994

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    <jats:p>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.</jats:p>

  33. Conversion of a conventional superconductor into a topological superconductor by topological proximity effect Peer-reviewed

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

    Nature Communications　11　(1)　2020/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-019-13946-0 　

    eISSN： 2041-1723

  34. Dirac Fermion Kinetics in 3D Curved Graphene

    Yoichi Tanabe, Yoshikazu Ito, Katsuaki Sugawara, Mikito Koshino, Shojiro Kimura, Tomoya Naito, Isaac Johnson, Takashi Takahashi, Mingwei Chen

    Advanced Materials　32　(48)　2005838-2005838　2020/12

    Publisher: Wiley

    DOI： 10.1002/adma.202005838 　

    ISSN： 1521-4095

    eISSN： 1521-4095

  35. Modulation of Dirac electrons in epitaxial Bi2Se3 ultrathin films on van der Waals ferromagnet Cr2Si2Te6 Peer-reviewed

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

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

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevmaterials.4.084202 　

    eISSN： 2475-9953

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

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

    Physical Review B　102　(8)　2020/08/06

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.102.085112 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  37. Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCoO2 ultrathin films Peer-reviewed

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

    Physical Review Research　2　(1)　013282　2020/03

    DOI： 10.1103/PhysRevResearch.2.013282 　

    ISSN： 2643-1564

  38. 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.

  39. 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

  40. 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　(7)　071001(R)　2019/07/10

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/physrevmaterials.3.071001 　

    ISSN： 2475-9953

  41. Monolayer VTe2 : Incommensurate Fermi surface nesting and suppression of charge density waves Peer-reviewed

    Katsuaki Sugawara

    Physical Review B　99　(24)　241404(R)　2019/06/18

    DOI： 10.1103/physrevb.99.241404 　

    ISSN： 2469-9950 2469-9969

  42. Vortex-induced quantum metallicity in the mono-unit-layer superconductor NbSe2 Peer-reviewed

    Katsuaki Sugawara

    Physical Review B　99　(22)　220501(R)　2019/06/05

    DOI： 10.1103/physrevb.99.220501 　

    ISSN： 2469-9950 2469-9969

  43. Pseudogap, Fermi arc, and Peierls-insulating phase induced by 3D-2D crossover in monolayer VSe2 Peer-reviewed

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

    Nano Research　12　(1)　165-169　2019

    DOI： 10.1007/s12274-018-2196-4 　

  44. 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

  45. Temperature insensitivity of Fermi surface in electron-doped high-temperature FeSe films on SrTiO3 Peer-reviewed

    Katsuaki Sugawara

    Journal of Physics: Conference Series　1054　012019　2018/07

    DOI： 10.1088/1742-6596/1054/1/012019 　

    ISSN： 1742-6588 1742-6596

  46. Ultrathin Bismuth Film on 1T-TaS2: Structural Transition and Charge-Density-Wave Proximity Effect Peer-reviewed

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

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

    Publisher: American Chemical Society

    DOI： 10.1021/acs.nanolett.8b01003 　

    ISSN： 1530-6992 1530-6984

  47. Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave Peer-reviewed

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

    npj 2D Materials and Applications　2　(1)　2018/05/03

    Publisher: Springer Nature

    DOI： 10.1038/s41699-018-0057-3 　

  48. Three-dimensional porous graphene networks expand graphene-based electronic device applications Peer-reviewed

    Yoshikazu Ito, Yoichi Tanabe, Katsuaki Sugawara, Mikito Koshino, Takashi Takahashi, Katsumi Tanigaki, Hideo Aoki, Mingwei Chen

    Physical Chemistry Chemical Physics　20　(9)　6024-6033　2018

    DOI： 10.1039/c7cp07667c 　

    ISSN： 1463-9076

  49. Selective fabrication of free-standing ABA and ABC trilayer graphene with/without Dirac-cone energy bands Peer-reviewed

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

    Npg Asia Materials　10　2018

    DOI： 10.1038/am.2017.238 　

    ISSN： 1884-4049

    eISSN： 1884-4057

  50. Three-dimensional porous graphene networks expand graphene-based electronic device applications Invited Peer-reviewed

    Yoshikazu Ito, Yoichi Tanabe, Katsuaki Sugawara, Mikito Koshino, Takashi Takahashi, Katsumi Tanigaki, Hideo Aoki, Mingwei Chen

    Physical Chemistry Chemical Physics　20　(9)　6024-6033　2018

    Publisher: Royal Society of Chemistry

    DOI： 10.1039/c7cp07667c 　

    ISSN： 1463-9076

  51. Selective fabrication of free-standing ABA and ABC trilayer graphene with/without Dirac-cone energy bands Peer-reviewed

    K. Sugawara, N. Yamamura, K. Matsuda, W. Norimatsu, M. Kusunoki, T, Sato, T. Takahashi

    NPG Asia Materials　10　e466　2018/01

  52. Weak localization in bilayer graphene with Li-intercalation/desorption Peer-reviewed

    Endo, Y., Ichinokura, S., Akiyama, R., Takayama, A., Sugawara, K., Nomura, K., Takahashi, T., Hasegawa, S.

    Journal of Physics-Condensed Matter　30　(30)　2018

    DOI： 10.1088/1361-648X/aaccc4 　

  53. Selective Fabrication of Mott-Insulating and Metallic Monolayer TaSe2 Peer-reviewed

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

    Acs Applied Nano Materials　1　(4)　1456-1460　2018

    DOI： 10.1021/acsanm.8b00184 　

  54. 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

  55. 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)　220509　2017/12

    DOI： 10.1103/PhysRevB.96.220509 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  56. Enhancement of band gap and evolution of in-gap states in hydrogen-adsorbed monolayer graphene on SiC(0001) Peer-reviewed

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

    Carbon　124　584-587　2017/11/01

    DOI： 10.1016/j.carbon.2017.09.024 　

    ISSN： 0008-6223

  57. Enhancement of band gap and evolution of in-gap states in hydrogen-adsorbed monolayer graphene on SiC(0001) Invited Peer-reviewed

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

    CARBON　124　584-587　2017/11

    DOI： 10.1016/j.carbon.2017.09.024 　

    ISSN： 0008-6223

    eISSN： 1873-3891

  58. Unconventional electronic structure of silicene on Ag/H-Si(111) Invited Peer-reviewed

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

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

    DOI： 10.1016/j.elspec.2016.10.005 　

    ISSN： 0368-2048

    eISSN： 1873-2526

  59. ARPES study of cesium-coated FeSe thin films on SrTiO3 Peer-reviewed

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

    Journal of Physics: Conference Series　871　(1)　012017　2017/07/26

    Publisher: Institute of Physics Publishing

    DOI： 10.1088/1742-6596/871/1/012017 　

    ISSN： 1742-6596 1742-6588

  60. 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

  61. 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

  62. 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

    Publisher: Physical Society of Japan

    DOI： 10.7566/JPSJ.86.033706 　

    ISSN： 1347-4073 0031-9015

  63. Electric Properties of Dirac Fermions Captured into 3D Nanoporous Graphene Networks Peer-reviewed

    Yoichi Tanabe, Yoshikazu Ito, Katsuaki Sugawara, Daisuke Hojo, Mikito Koshino, Takeshi Fujita, Tsutomu Aida, Xiandong Xu, Khuong Kim Huynh, Hidekazu Shimotani, Tadafumi Adschiri, Takashi Takahashi, Katsumi Tanigaki, Hideo Aoki, Mingwei Chen

    ADVANCED MATERIALS　28　(46)　10304-10310　2016/12

    DOI： 10.1002/adma.201601067 　

    ISSN： 0935-9648

    eISSN： 1521-4095

  64. Monolayer 1 T-NbSe2 as a Mott insulator Peer-reviewed

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

    NPG ASIA MATERIALS　8　e321　2016/11

    DOI： 10.1038/am.2016.157 　

    ISSN： 1884-4049

    eISSN： 1884-4057

  65. Two-dimensional metallic NbS2: growth, optical identification and transport properties Peer-reviewed

    Sihan Zhao, Takato Hotta, Takashi Koretsune, Kenji Watanabe, Takashi Taniguchi, Katsuaki Sugawara, Takashi Takahashi, Hisanori Shinohara, Ryo Kitaura

    2D MATERIALS　3　(2)　025027　2016/06

    DOI： 10.1088/2053-1583/3/2/025027 　

    ISSN： 2053-1583

  66. Enhancement of electron-phonon coupling in Cs-overlayered intercalated bilayer graphene Peer-reviewed

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

    JOURNAL OF PHYSICS-CONDENSED MATTER　28　(20)　20400　2016/05

    DOI： 10.1088/0953-8984/28/20/204001 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  67. Tunable two-dimensional electron gas at the surface of thermoelectric material In4Se3 Peer-reviewed

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

    PHYSICAL REVIEW B　93　(20)　205156　2016/05

    DOI： 10.1103/PhysRevB.93.205156 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  68. Bulk superconducting gap of V3Si studied by low-energy ultrahigh-resolution photoemission spectroscopy Peer-reviewed

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

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

    DOI： 10.1016/j.elspec.2015.04.009 　

    ISSN： 0368-2048

    eISSN： 1873-2526

  69. Superconducting Calcium-Intercalated Bilayer Graphene Peer-reviewed

    Satoru Ichinokura, Katsuaki Sugawara, Akari Takayama, Takashi Takahashi, Shuji Hasegawa

    ACS NANO　10　(2)　2761-2765　2016/02

    DOI： 10.1021/acsnano.5b07848 　

    ISSN： 1936-0851

    eISSN： 1936-086X

  70. Unconventional Charge-Density-Wave Transition in Monolayer 1T-TiSe2 Peer-reviewed

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

    ACS NANO　10　(1)　1341-1345　2016/01

    DOI： 10.1021/acsnano.5b06727 　

    ISSN： 1936-0851

    eISSN： 1936-086X

  71. Switching of Dirac-Fermion Mass at the Interface of Ultrathin Ferromagnet and Rashba Metal Peer-reviewed

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

    PHYSICAL REVIEW LETTERS　115　(26)　266401　2015/12

    DOI： 10.1103/PhysRevLett.115.266401 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  72. 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

  73. Spin- and valley-coupled electronic states in monolayer WSe2 on bilayer graphene Peer-reviewed

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

    APPLIED PHYSICS LETTERS　107　(7)　071601　2015/08

    DOI： 10.1063/1.4928658 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  74. 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

  75. Charge-Density Wave in Ca-Intercalated Bilayer Graphene Induced by Commensurate Lattice Matching Peer-reviewed

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

    PHYSICAL REVIEW LETTERS　114　(14)　146103　2015/04

    DOI： 10.1103/PhysRevLett.114.146103 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  76. Direct Observation of Dirac Cone in Multilayer Silicene Intercalation Compound CaSi2 Peer-reviewed

    Eiichi Noguchi, Katsuaki Sugawara, Ritsuko Yaokawa, Taro Hitosugi, Hideyuki Nakano, Takashi Takahashi

    ADVANCED MATERIALS　27　(5)　856-860　2015/02

    DOI： 10.1002/adma.201403077 　

    ISSN： 0935-9648

    eISSN： 1521-4095

  77. Anisotropic Electron-Phonon Coupling in Rb-Intercalated Bilayer Graphene Peer-reviewed

    James Kleeman, Katsuaki Sugawara, Takafumi Sato, Takashi Takahashi

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

    DOI： 10.7566/JPSJ.83.124715 　

    ISSN： 0031-9015

  78. Graphene dots fabrication by a bio-template and a neutral beam etching Peer-reviewed

    Koki Igarashi, Takeru Okada, Patrick Han, Katsuaki Sugawara, Taro Hitosugi, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  79. Band-gap tuning of monolayer graphene by oxygen adsorption Peer-reviewed

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

    CARBON　73　141-145　2014/07

    DOI： 10.1016/j.carbon.2014.02.049 　

    ISSN： 0008-6223

    eISSN： 1873-3891

  80. High-Quality Three-Dimensional Nanoporous Graphene Peer-reviewed

    Yoshikazu Ito, Yoichi Tanabe, H. -J. Qiu, Katsuaki Sugawara, Satoshi Heguri, Ngoc Han Tu, Khuong Kim Huynh, Takeshi Fujita, Takashi Takahashi, Katsumi Tanigaki, Mingwei Chen

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION　53　(19)　4822-4826　2014/05

    DOI： 10.1002/anie.201402662 　

    ISSN： 1433-7851

    eISSN： 1521-3773

  81. High-Quality Three-dimensional Nanoporous Graphene Peer-reviewed

    Y. Ito, Y. Tanabe, H. J. Qiu, K. Sugawara, S. Heguri, N. H. Tu, K. K. Huynh, T. Fujita, T. Takahashi, K. Tanigaki, M. W. Chen

    Angewandte Chemie International Edition　126　4922-4926　2014/03/28

    DOI： 10.1002/ange.201402662 　

  82. Direct evidence for a metallic interlayer band in Rb-intercalated bilayer graphene Peer-reviewed

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

    PHYSICAL REVIEW B　87　(19)　195401　2013/05

    DOI： 10.1103/PhysRevB.87.195401 　

    ISSN： 1098-0121

  83. Ca intercalated bilayer graphene as a thinnest limit of superconducting C6Ca Peer-reviewed

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

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

    DOI： 10.1073/pnas.1208889109 　

    ISSN： 0027-8424

  84. Fabrication of Li-intercalated bilayer graphene Peer-reviewed

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

    AIP ADVANCES　1　(2)　022103　2011/06

    DOI： 10.1063/1.3582814 　

    ISSN： 2158-3226

  85. Photoemission study of electronic structure evolution across the metal-insulator transition of heavily B-doped diamond Peer-reviewed

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

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

    DOI： 10.1016/j.jpcs.2010.10.052 　

    ISSN： 0022-3697

  86. Evolution of surface states in Bi1-xSbx alloys across the topological phase transition Peer-reviewed

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

    PHYSICAL REVIEW B　83　(20)　201104　2011/05

    DOI： 10.1103/PhysRevB.83.201104 　

    ISSN： 1098-0121

  87. Semiconductor-Metal Transition and Band-Gap Tuning in Quasi-Free-Standing Epitaxial Bilayer Graphene on SiC Peer-reviewed

    Katsuaki Sugawara, Takafumi Sato, Kohei Kanetani, Takashi Takahashi

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

    DOI： 10.1143/JPSJ.80.024705 　

    ISSN： 0031-9015

  88. Ultrahigh-resolution spin-resolved photoemission spectrometer with a mini Mott detector (vol 81, 095101, 2010) Peer-reviewed

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

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

    DOI： 10.1063/1.3503485 　

    ISSN： 0034-6748

  89. Ultrahigh-resolution spin-resolved photoemission spectrometer with a mini Mott detector Peer-reviewed

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

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

    DOI： 10.1063/1.3480542 　

    ISSN： 0034-6748

  90. Direct Evidence for the Dirac-Cone Topological Surface States in the Ternary Chalcogenide TlBiSe2 Peer-reviewed

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

    PHYSICAL REVIEW LETTERS　105　(13)　136802　2010/09

    DOI： 10.1103/PhysRevLett.105.136802 　

    ISSN： 0031-9007

  91. Peculiar Rashba Splitting Originating from the Two-Dimensional Symmetry of the Surface Peer-reviewed

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

    PHYSICAL REVIEW LETTERS　103　(15)　156801　2009/10

    DOI： 10.1103/PhysRevLett.103.156801 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  92. Fermi-surface-dependent superconducting gap in C6Ca Peer-reviewed

    K. Sugawara, T. Sato, T. Takahashi

    NATURE PHYSICS　5　(1)　40-43　2009/01

    DOI： 10.1038/NPHYS1128 　

    ISSN： 1745-2473

  93. Quasiparticle lifetime in graphite studied by ultrahigh-resolution ARPES Peer-reviewed

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

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

    DOI： 10.1016/j.jpcs.2008.06.008 　

    ISSN： 0022-3697

  94. 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

  95. Low-energy excitations in graphite studied by ultrahigh-resolution angle-resolved photoemission spectroscopy Peer-reviewed

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

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

    DOI： 10.1016/j.physb.2007.10.181 　

    ISSN： 0921-4526

  96. Cooperative structural and Peierls transition of indium chains on Si(111) Peer-reviewed

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

    PHYSICAL REVIEW B　77　(12)　125115　2008/03

    DOI： 10.1103/PhysRevB.77.125115 　

    ISSN： 1098-0121

  97. 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

  98. Anomalous superconducting-gap symmetry of noncentrosymmetric La(2)C(3) observed by ultrahigh-resolution photoemission spectroscopy Peer-reviewed

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

    PHYSICAL REVIEW B　76　(13)　132512　2007/10

    DOI： 10.1103/PhysRevB.76.132512 　

    ISSN： 1098-0121

  99. 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

  100. Anisotropic spin-orbit interaction in Sb(111) surface studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

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

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

    DOI： 10.1016/j.jmmm.2006.11.119 　

    ISSN： 0304-8853

  101. Anomalous quasiparticle lifetime and strong electron-phonon coupling in graphite Peer-reviewed

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

    PHYSICAL REVIEW LETTERS　98　(3)　036801　2007/01

    DOI： 10.1103/PhysRevLett.98.036801 　

    ISSN： 0031-9007

  102. Fermi surface and anisotropic spin-orbit coupling of sb(111) studied by angle-resolved photoemission spectroscopy Peer-reviewed

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

    PHYSICAL REVIEW LETTERS　96　(4)　046411　2006/02

    DOI： 10.1103/PhysRevLett.96.046411 　

    ISSN： 0031-9007

  103. Anomalous electronic states in graphite studied by angle-resolved photoemission spectroscopy Peer-reviewed

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

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS　7　S94-S98　2006

    DOI： 10.1016/j.stam.2006.04.007 　

    ISSN： 1468-6996

  104. Fermi surface and edge-localized states in graphite studied by high-resolution angle-resolved photoemission spectroscopy Peer-reviewed

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

    PHYSICAL REVIEW B　73　(4)　045124　2006/01

    DOI： 10.1103/PhysRevB.73.045124 　

    ISSN： 1098-0121

Show all ︎Show first 5

Misc. 184

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. High-resolution ARPES study of Bismuthene on H-SiC

    八重樫健, 川上竜平, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　77　(1)　2022

    ISSN： 2189-079X

  9. 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

  10. 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

  11. 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

  12. Electronic states of α-Bi and bismuthine on H-SiC: high-resolution ARPES

    八重樫健, 川上竜平, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　77　(2)　2022

    ISSN： 2189-079X

  13. 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

  14. VTe2薄膜の高分解能ARPES

    川上竜平, 田口大樹, 加藤剛臣, 猿田康朗, 菅原克明, 高橋隆, 佐藤宇史, 菅原克明, 高橋隆, 佐藤宇史, 菅原克明, 高橋隆, 佐藤宇史

    日本放射光学会年会・放射光科学合同シンポジウム(Web)　34th　2021

  15. 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

  16. 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

  17. 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

  18. Quasi-one-dimensional Fermi surface and charge-density-wave phase of multilayer VTe2 thin films studied by high-resolution ARPES

    川上竜平, 加藤剛臣, 田口大樹, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  19. Fine electronic structure of the atomic layer MoTe2 thin films: High-resolution ARPES

    猿田康朗, 加藤剛臣, 川上竜平, 田口大樹, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  20. 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

  21. Micro-ARPES study of atomic-layer 1T’/1H-MoTe2 thin films

    猿田康朗, 加藤剛臣, 川上竜平, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 北村未歩, 堀場弘司, 組頭広志, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　76　(2)　2021

    ISSN： 2189-079X

  22. High-resolution ARPES study of atomic-layer Bi film on hydrogen-terminated SiC

    八重樫健, 川上竜平, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　76　(2)　2021

    ISSN： 2189-079X

  23. 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

  24. Electronic properties of 3D graphene architecture

    田邉洋一, 伊藤良一, 菅原克明, 菅原克明, 越野幹人, 木村尚次郎, 内藤智也, 内藤智也, JOHNSON Isaac, 高橋隆, CHEN Mingwei, CHEN Mingwei

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  25. 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

  26. 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

  27. 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

  28. High-resolution ARPES study of atomic layer TiSe2-x thin film

    菅原克明, 菅原克明, 菅原克明, 中田優樹, 川上竜平, 佐藤匠, 田口大樹, 加藤剛臣, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　75　(1)　2020

    ISSN： 2189-079X

  29. High-resolution ARPES study of NbTe2 atomic layer thin film

    田口大樹, 中田優樹, 川上竜平, 佐藤匠, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　75　(1)　2020

    ISSN： 2189-079X

  30. High-resolution ARPES study of monolayer and multilayer VTe2 thin films

    川上竜平, 中田優樹, 佐藤匠, 田口大樹, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　75　(1)　2020

    ISSN： 2189-079X

  31. Quasi-one-dimensional electronic states of multilayer VTe2 thin films studied by high-resolution ARPES

    川上竜平, 田口大樹, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　75　(2)　2020

    ISSN： 2189-079X

  32. Electronic states of mono- and multi-layer NbTe2 films studied by ARPES

    田口大樹, 川上竜平, 加藤剛臣, 猿田康朗, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　75　(2)　2020

    ISSN： 2189-079X

  33. High-resolution ARPES study of the atomic layer MoTe2 thin films

    猿田康朗, 加藤剛臣, 川上竜平, 田口大樹, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　75　(2)　2020

    ISSN： 2189-079X

  34. Scanning tunneling spectroscopy on Pb thin films on topological insulator Bi2Se3

    町田理, 町田理, 菅原克明, 菅原克明, 菅原克明, 幸坂祐生, 佐藤宇史, 佐藤宇史, 佐藤宇史, 笹川崇男, 花栗哲郎

    日本物理学会講演概要集(CD-ROM)　75　(2)　2020

    ISSN： 2189-079X

  35. 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

  36. 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

  37. 単層VTe2薄膜の電子構造:高分解能ARPES

    川上竜平, 中田優樹, 佐藤匠, 田口大樹, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　74　(2)　2019

    ISSN： 2189-079X

  38. NbTe2原子層薄膜の電子状態:高分解能ARPES

    田口大樹, 中田優樹, 川上竜平, 佐藤匠, 加藤剛臣, 菅原克明, 菅原克明, 菅原克明, 高橋隆, 高橋隆, 高橋隆, 佐藤宇史, 佐藤宇史, 佐藤宇史

    日本物理学会講演概要集(CD-ROM)　74　(2)　2019

    ISSN： 2189-079X

  39. 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

  40. ナノ多孔質グラフェントランジスタの輸送現象

    田邉洋一, 伊藤良一, 伊藤良一, 菅原克明, 北條大介, 越野幹人, 藤田武志, 相田努, XU Xiandong, HUYNH Khuong Kim, 下谷秀和, 阿尻雅文, 高橋隆, 高橋隆, 谷垣勝己, 谷垣勝己, 青木秀夫, 青木秀夫, CHEN Mingwei

    日本物理学会講演概要集(CD-ROM)　72　(1)　ROMBUNNO.17pB21‐10　2017/03/21

    ISSN： 2189-079X

  41. 電気2重層を用いたナノ多孔質グラフェンのキャリア制御

    田邉洋一, 伊藤良一, 伊藤良一, 菅原克明, 北條大介, 越野幹人, 藤田武志, 相田努, XU Xiandong, HUYNH Kim Khuong, 下谷秀和, 阿尻雅文, 高橋隆, 高橋隆, 谷垣勝己, 谷垣勝己, 青木秀夫, 青木秀夫, CHEN Mingwei

    応用物理学会春季学術講演会講演予稿集(CD-ROM)　64th　ROMBUNNO.15p‐B6‐14　2017/03/01

    ISSN： 2436-7613

  42. 超伝導グラフェン

    高橋隆, 菅原克明

    NEW DIAMOND　33　25-27　2017

  43. 原子層物質の金属と半導体の作り分け

    菅原克明, 高橋隆

    セラミックス　52　157-157　2017

  44. 2層グラフェン層間化合物の２次元超伝導

    高橋隆, 菅原克明, 一ノ倉聖, 高山あかり, 長谷川修司

    表面物理　38　(9)　460-465　2017

    Publisher: The Surface Science Society of Japan

    DOI： 10.1380/jsssj.38.460 　

    ISSN： 0388-5321

    More details Close

    <p>We have fabricated alkali metal (Li, Rb, Cs) and alkaline-earth metal (Ca) intercalated bilayer graphene on SiC substrate, and characterized them by low-energy electron diffraction, angle-resolved photoemission spectroscopy, and 4-point-probe measurements. We observed a free-electron-like state in the center of the Brillouin zone, called &ldquo;interlayer state&rdquo;, as well as the folded &pi;/&pi;* bands in Rb-, Cs-, and Ca-intercalated graphene, while it was absent in Li counterpart. Ca-intercalated bilayer graphene shows the zero-resistance below 4K, indicative of the two-dimensional superconductivity. These results suggest that the interlayer state plays an important role for the superconductivity in intercalated bilayer graphene.</p>

  45. 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

  46. 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

  47. 19pPSA-31 Transport property of bilayer graphene studied by in situ four-point probe resistance measurements

    Endo Y., Ichinokura S., Suzuki K., Sugawara K., Akiyama R., Takayama A., Takahashi T., Hasegawa S.

    Meeting Abstracts of the Physical Society of Japan　71　2535-2535　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_2535 　

    ISSN： 2189-079X

  48. 19aAJ-4 Electronic structure of Bi ultrathin film on transition-metal dichalcogenide 1T-TaS_2 studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　71　2470-2470　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_2470 　

    ISSN： 2189-079X

  49. 22aAJ-8 Superconductivity in Ca-intercalated Bilayer Graphene

    Ichinokura S., Sugawara K., Takayama A., Takahashi T., Hasegawa S.

    Meeting Abstracts of the Physical Society of Japan　71　2629-2629　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_2629 　

    ISSN： 2189-079X

  50. 20pBE-2 Thickness dependence of electronic states in NbSe_2 thin film studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　71　1868-1868　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1868 　

    ISSN： 2189-079X

  51. 22aAS-3 High-resolution ARPES study of trilayer graphene on H-SiC

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

    Meeting Abstracts of the Physical Society of Japan　71　1926-1926　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1926 　

    ISSN： 2189-079X

  52. 20pBE-1 High-resolution ARPES study of TiSe_2 thin film

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

    Meeting Abstracts of the Physical Society of Japan　71　1867-1867　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1867 　

    ISSN： 2189-079X

  53. 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

  54. 19aBP-3 High-resolution ARPES study of K-adsorbed monolayer graphene/SiC

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

    Meeting Abstracts of the Physical Society of Japan　71　1443-1443　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1443 　

    ISSN： 2189-079X

  55. 19aBP-5 Hybridization effects on the Dirac-cone electronic states of Bi_2Se_3 ultrathin films studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　71　1445-1445　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1445 　

    ISSN： 2189-079X

  56. Transport property of bilayer graphene on SiC crystal and the influence of Li intercalation

    Endo Yukihiro, Ichinokura Satoru, Suzuki Katsuaki, Sugawara Katsuaki, Akiyama Ryota, Takayama Akari, Nomura Kentaro, Takahashi takashi, Hasegawa syuji

    Abstract of annual meeting of the Surface Science of Japan　36　443-443　2016

    Publisher: The Surface Science Society of Japan

    DOI： 10.14886/sssj2008.36.0_443 　

  57. Search for two-dimensional topological insulators in atomic-layer Bi thin films by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　71　1185-1185　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1185 　

  58. Temperature dependence of band structure in TiSe2 ultrathin film

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

    Meeting Abstracts of the Physical Society of Japan　71　1172-1172　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1172 　

  59. Electronic structure of atomic layer NbSe2 thin film studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　71　1171-1171　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1171 　

  60. K-doped trilayer graphene: high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　71　1690-1690　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1690 　

  61. Quantum transport properties of bilayer graphene on SiC studied by in situ four-point probe resistance measurements

    Endo Y., Ichinokura S., Suzuki K., Sugawara K., Akiyama R., Takayama A., Takahashi T., Hasegawa S.

    Meeting Abstracts of the Physical Society of Japan　71　2450-2450　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_2450 　

  62. 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 　

  63. 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 　

  64. High-resolution ARPES study of Li-adsorbed monolayer graphene

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

    Meeting Abstracts of the Physical Society of Japan　71　1330-1330　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1330 　

  65. High-resolution ARPES study of NbSe2 thin film grown on Graphene

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

    Meeting Abstracts of the Physical Society of Japan　71　1393-1393　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1393 　

  66. Anomalous band structure of Bi ultrathin film on 1T-TaS2 studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　71　2310-2310　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_2310 　

  67. 16pCB-7 Mass control of Dirac electrons at the interface of Fe/W(110)

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

    Meeting Abstracts of the Physical Society of Japan　70　2255-2255　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_2255 　

    ISSN： 2189-079X

  68. 16pCB-10 High-resolution angle-resolved photoemission study of quasi-one-dimensional electronic states on W(112)

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

    Meeting Abstracts of the Physical Society of Japan　70　2258-2258　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_2258 　

    ISSN： 2189-079X

  69. 17pAH-4 High-resolution ARPES study of NbSe_2 thin film

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

    Meeting Abstracts of the Physical Society of Japan　70　1592-1592　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_1592 　

    ISSN： 2189-079X

  70. 17pAH-3 High-resolution ARPES study of WSe_2 thin film

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

    Meeting Abstracts of the Physical Society of Japan　70　1591-1591　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_1591 　

    ISSN： 2189-079X

  71. 19pCA-4 Film-thickness dependence of electronic states in Bi_2Se_3 thin film studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　70　2379-2379　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_2379 　

    ISSN： 2189-079X

  72. 18aCE-3 Bi ultrathin film on 1T-TaS_2 studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　70　1230-1230　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_1230 　

    ISSN： 2189-079X

  73. 18aCE-2 High-resolution ARPES study of trilayer graphene on H-SiC

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

    Meeting Abstracts of the Physical Society of Japan　70　1229-1229　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_1229 　

    ISSN： 2189-079X

  74. 18aAE-10 Hydrogen-adsorption effect of monolayer graphene on SiC studied by high-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　70　1079-1079　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_1079 　

    ISSN： 2189-079X

  75. 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

  76. 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

  77. 18aAG-10 ARPES study of Bi-based topological-insulator thin films using newly-developed spin-resolved ARPES system

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

    Meeting Abstracts of the Physical Society of Japan　70　1093-1093　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_1093 　

    ISSN： 2189-079X

  78. 19aCG-2 Oxygen adsorption effect on surface electronic band structure in Fe(110) thin film : High-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　70　967-967　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_967 　

    ISSN： 2189-079X

  79. 23pAS-4 Development of spin-resolved photoemission spectrometer and electronic structure of topological-insulator thin film

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

    Meeting Abstracts of the Physical Society of Japan　70　2629-2629　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_2629 　

    ISSN： 2189-079X

  80. 24aAL-1 Hydrogen-absorption-dependence of electronic states in single-layer graphene

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

    Meeting Abstracts of the Physical Society of Japan　70　1902-1902　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1902 　

    ISSN： 2189-079X

  81. 21pAS-2 Electronic structure of graphene related materials studied by high-resolution ARPES

    Sugawara Katsuaki

    Meeting Abstracts of the Physical Society of Japan　70　1809-1810　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1809 　

    ISSN： 2189-079X

  82. 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

  83. 22pAC-7 Electron-phonon coupling of Cs-intercalated bilayer graphene

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

    Meeting Abstracts of the Physical Society of Japan　70　1850-1850　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1850 　

    ISSN： 2189-079X

  84. 23pAB-4 High-resolution ARPES study of transition metal dichalcogenide thin film

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

    Meeting Abstracts of the Physical Society of Japan　70　1348-1348　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1348 　

    ISSN： 2189-079X

  85. 21aCN-1 Development of ultrahigh-resolution spin-resolved photoemission spectrometer

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

    Meeting Abstracts of the Physical Society of Japan　70　1417-1417　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1417 　

    ISSN： 2189-079X

  86. 21aCN-2 Fabrication and ARPES study of ultrathin films of topological insulator Bi_2Se_3

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

    Meeting Abstracts of the Physical Society of Japan　70　1418-1418　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1418 　

    ISSN： 2189-079X

  87. 23pAB-10 High-resolution ARPES study of multilayer silcene intercalation compound CaSi_2

    Noguchi E., Sugawara K., Hitosugi T., Yaokawa R., Nakano H., Takahashi T.

    Meeting Abstracts of the Physical Society of Japan　70　1353-1353　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1353 　

    ISSN： 2189-079X

  88. 21pAB-4 Magnetic proximity effect to Dirac-cone states at the interface of Fe/W(110) : High-resolution ARPES

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

    Meeting Abstracts of the Physical Society of Japan　70　2519-2519　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_2519 　

    ISSN： 2189-079X

  89. 21aCN-4 High-resolution angle-resolved photoemission study of W(112)

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

    Meeting Abstracts of the Physical Society of Japan　70　1420-1420　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1420 　

    ISSN： 2189-079X

  90. 2層グラフェン層間化合物における強い電子格子相互作用

    菅原克明, 高橋隆, Thomas James Kleeman

    固体物理　50　(9)　489-496　2015

    Publisher: アグネ技術センター

    ISSN： 0454-4544

  91. 10aAH-6 High-resolution ARPES study of hydrogen-adsobed graphene

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

    Meeting abstracts of the Physical Society of Japan　69　(2)　626-626　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  92. 9pAJ-5 High-resolution ARPES study of Co/W(110)

    Goto T., Honma K., Sugawara K., Souma S., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　69　(2)　530-530　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  93. 9pAJ-6 Atom-absorption effect of quantized states on Ag/Si(111) studied by high-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　69　(2)　531-531　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  94. 9pAJ-7 Electronic Structure of Ultrathin Intercalation Compound C_8Cs

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

    Meeting abstracts of the Physical Society of Japan　69　(2)　531-531　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  95. 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

  96. 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

  97. 8aBF-4 High-resolution ARPES study of ultrathin Fe film

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

    Meeting abstracts of the Physical Society of Japan　69　(2)　287-287　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  98. 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

  99. 29pAQ-1 High-resolution ARPES study of oxygen-adsorbed Fe/VU(110) surface

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

    Meeting abstracts of the Physical Society of Japan　69　(1)　898-898　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  100. 28pCL-1 Anisotropic electron-phonon coupling in Rb-intercalated bilayer graphene

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

    Meeting abstracts of the Physical Society of Japan　69　(1)　710-710　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  101. 28aBF-9 Electronic states of Bi-deposited TlBiSe2 studied by High-resolution ARPES

    Shoman T., Takayama A., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T., Eto K., Segawa K., Ando Y.

    Meeting abstracts of the Physical Society of Japan　69　(1)　706-706　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  102. 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

  103. 28aAQ-6 Layer dependence of electronic structure of graphene on H-terminated SiC studied by high-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　69　(1)　878-878　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  104. 27pAQ-4 High-resolution ARPES study of K-deposited Ag thin film

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

    Meeting abstracts of the Physical Society of Japan　69　(1)　874-874　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  105. 高い電気伝導性を持った3次元ナノ多孔質グラフェン

    伊藤良一, 田邉洋一, QIU H.‐J, 菅原克明, 平郡諭, TU Ngoc Han, HUYNH Khuong Kim, 藤田武志, 高橋隆, 高橋隆, 谷垣勝己, 谷垣勝己, 陳明偉, 陳明偉, 陳明偉

    分子科学討論会講演プログラム&amp;要旨(Web)　8th　ROMBUNNO.3C14 (WEB ONLY)　2014

  106. Electronic structure of graphene and related materials studied by ARPES

    Katsuaki Sugawara, Takashi Takahashi

    Journal of the Vacuum Society of Japan　57　(11)　416-422　2014

    Publisher: Vacuum Society of Japan

    DOI： 10.3131/jvsj2.57.416 　

    ISSN： 1882-2398

  107. ARPES study of graphene intercalation compounds

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

    Meeting abstracts of the Physical Society of Japan　68　(2)　797-797　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  108. Band-gap tuning of oxygen-adsorbed graphene : High-resolution ARPES

    Takahashi Toru, Noguchi E., Kleeman J., Sato T., Sugawara K., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　68　(2)　782-782　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  109. Electronic structure of metal-atom-deposited TlBiSe_2 : High-resolution ARPES

    Shoman T., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T., Eto K., Segawa K., Ando Y.

    Meeting abstracts of the Physical Society of Japan　68　(2)　786-786　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  110. High-resolution ARPES study of Fe/W(110)

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

    Meeting abstracts of the Physical Society of Japan　68　(2)　701-701　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  111. 28pDB-8 Electron-Phonon Coupling in Alkali-Doped Bilayer Graphene Studied by ARPES

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

    Meeting abstracts of the Physical Society of Japan　68　(2)　701-701　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  112. High-resolution ARPES study of oxygen-adsorbed monolayer graphene

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

    Meeting abstracts of the Physical Society of Japan　68　(2)　701-701　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  113. 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

  114. Intercalated bilayer grapheme : Possibility of application for fast-charging battery and superconducting nano devises

    Material stage　13　(3)　9-12　2013/06

    Publisher: 技術情報協会

    ISSN： 1346-3926

  115. 29aEJ-9 High-resolution ARPES study of W(110) surface

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

    Meeting abstracts of the Physical Society of Japan　68　(1)　855-855　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  116. 29aEJ-8 Band-gap tuning of mono-layer graphene on SiC studied by high-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　68　(1)　855-855　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  117. 29aEJ-7 High-resolution ARPES study of metal-atom-adsorped topological-insulator surface

    Shoman T., Tanaka Y., Sugawara K., Souma S., Sato T., Takahashi T., Eto K., Segawa K., Ando Y.

    Meeting abstracts of the Physical Society of Japan　68　(1)　855-855　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  118. 29aXP-4 High-resolution ARPES study of oxygen-adsorbed graphene

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

    Meeting abstracts of the Physical Society of Japan　68　(1)　960-960　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  119. 29aXP-2 ARPES study of alkali-doped bilayer graphene

    Kleeman James, Takahashi Toru, Sugawara Katsuaki, Sato Takafumi, Takahashi Takashi

    Meeting abstracts of the Physical Society of Japan　68　(1)　960-960　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  120. 29aXP-1 Electronic structure of intercalated bilayer graphene C_6AC_6(A=Li,Ca)

    Sugawara K., Kanetani K., Sato T., Shimizu R., Iwaya K., Hitosugi T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　68　(1)　960-960　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  121. 27pXT-6 Quasiparticle states in ultrathin fims

    Sugawara Katsuaki

    Meeting abstracts of the Physical Society of Japan　68　(1)　946-946　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  122. 二層グラフェン層間化合物

    菅原克明, 高橋隆

    MATERIAL STAGE　13　9-12　2013

  123. Li原子とグラフェンのサンドウィッチに成功

    高橋隆, 菅原克明

    化学　68　74-75　2013

  124. 20aFJ-10 High-resolution ARPES study of multi-layer graphene on H-terminated SiC

    Takahashi Toru, Sugawara K., Kleeman James, Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　67　(2)　698-698　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  125. 19aEC-4 High-resolution ARPES studies of mono-/multi-layer graphene on H-terminated SIC

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

    Meeting abstracts of the Physical Society of Japan　67　(2)　768-768　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  126. 26pSB-7 Layer dependence of electronic structure of graphene on H-terminated SiC : High-resolution ARPES study

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

    Meeting abstracts of the Physical Society of Japan　67　(1)　915-915　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  127. 25pAC-7 High-tesolution ARPES study of graphene on H-temiinated SiC

    Takahashi Toru, Sugawara K., Kanatani K., Kleeman James, Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　67　(1)　804-804　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  128. 25pAC-8 Electronic structure of Rb-doped bilayer graphene studied by ARPES

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

    Meeting abstracts of the Physical Society of Japan　67　(1)　804-804　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  129. 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

  130. 21aTN-9 High-Resolution ARPES study of potassium doped bilayer graphene

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

    Meeting abstracts of the Physical Society of Japan　66　(2)　720-720　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  131. 22aTE-10 High-resolution ARPES study of Ca-doped graphene

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

    Meeting abstracts of the Physical Society of Japan　66　(2)　859-859　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  132. 22aTE-11 High-resolution ARPES study of K-doped bilayer graphene on H-terminated SiC

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

    Meeting abstracts of the Physical Society of Japan　66　(2)　860-860　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  133. 28pTA-5 High-resolution ARPES of K-doped bilayer graphene on H-terminated SiC

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

    Meeting abstracts of the Physical Society of Japan　66　(1)　895-895　2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  134. 25aTB-5 Electronic structure of C_6LiC_6 grown on SiC : ultrahigh-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　66　(1)　845-845　2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  135. 26aHB-7 High-resolution ARPES study of electron-doped bilayer graphene

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

    Meeting abstracts of the Physical Society of Japan　66　(1)　769-769　2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  136. 26aHG-5 High-resolution ARPES study of new topological insulator TlBiSe_2

    Souma S., Segawa K., Sato T., Guo H., Sugawara K., Ando Y., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　66　(1)　707-707　2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  137. 23pRA-11 High-resolution ARPES study of Li-doped bilayer graphene

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

    Meeting abstracts of the Physical Society of Japan　65　(2)　780-780　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  138. 25aWX-3 Spin-resolved electronic structure of Bi(111) surface

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

    Meeting abstracts of the Physical Society of Japan　65　(2)　873-873　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  139. 23pRG-2 Development of spin-resolved photoemission spectrometer based on mini-Mott detector: IV

    Souma S., Takayama A., Sugawara K., Guo H., Kosaka K., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　65　(2)　682-682　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  140. 24pRE-9 High-resolution ARPES study of Bi_<1-x>Sb_x(x=0.023)

    Guo H., Sugawara K., Takayama A., Souma S., Sato T., Sato N., Sasaki M., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　65　(2)　703-703　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  141. 20pGQ-1 Ultrahigh-resolution spin-resolved ARPES study of Bi thin film

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

    Meeting abstracts of the Physical Society of Japan　65　(1)　931-931　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  142. 21pGP-3 High-resolution ARPES study of Li-doped graphene on SiC

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

    Meeting abstracts of the Physical Society of Japan　65　(1)　878-878　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  143. 22pGV-6 ARPES study of graphene on SiC

    Sugawara Katsuaki

    Meeting abstracts of the Physical Society of Japan　65　(1)　908-908　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  144. 23pHL-9 Development of spin-resolved photoemission spectrometer based on mini-Mott detector: III

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

    Meeting abstracts of the Physical Society of Japan　65　(1)　811-811　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  145. 23pHL-1 High-resolution ARPES study of single- and multi-layer graphene

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

    Meeting abstracts of the Physical Society of Japan　65　(1)　809-809　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  146. C6Caの層間電子超伝導

    菅原克明, 佐藤宇史, 高橋隆

    日本物理学会誌　65　256-259　2010

  147. 27aYG-4 Development of a mini-Mott spin detector and Rashba effect in surface electronic states of group-V semimetals

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

    Meeting abstracts of the Physical Society of Japan　64　(2)　834-834　2009/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  148. 27pYE-6 High-resolution ARPES study of high quality growth graphene

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

    Meeting abstracts of the Physical Society of Japan　64　(2)　783-783　2009/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  149. 26pXA-9 Development of spin-resolved photoemission spectrometer based on a mini-Mott detector: II

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

    Meeting abstracts of the Physical Society of Japan　64　(2)　636-636　2009/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  150. グラフェンの光電子分光

    菅原克明, 佐藤宇史, 高橋隆

    グラフェンの機能と応用展望　2009/04/01

    Publisher: シーエムシー出版

  151. 30aTL-2 Observation of the electronic-structure evolution across metal-insulator transition of heavily B-doped diamond by photoemission spectroscopy

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

    Meeting abstracts of the Physical Society of Japan　64　(1)　654-654　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  152. 30aVA-10 Development of spin-resolved photoemission spectrometer based on mni-Mott detector

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

    Meeting abstracts of the Physical Society of Japan　64　(1)　763-763　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  153. 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

  154. 27aYH-6 Surperconducting gap and electron-phonon interaction in CaC_6 : high-resolution ARPES

    Sugawara K., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　64　(1)　812-812　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  155. 28aYH-6 Sample growth and high-resolution ARPES study of single- and multi-layer graphene

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

    Meeting abstracts of the Physical Society of Japan　64　(1)　828-828　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  156. 黒鉛超伝導体のメカニズムを解明

    佐藤宇史, 菅原克明, 高橋隆

    技術総合誌 OHM　96　8-9　2009

  157. 20aYD-1 High-resolution ARPES study on Pb/Si(111)

    Mizuno K., Tago Y., Sun Yujie, Sugawara K., Souma S., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　63　(2)　619-619　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  158. 20aYD-2 Electronic states of In-"1x1"/Si(111) : Temperature dependence

    Tago Y., Sun Yujie, Mizuno K., Sugawara K., Souma S., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　63　(2)　619-619　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  159. 21pTA-5 ARPES study of electronic states in graphene and related materials

    Sugawara Katsuaki

    Meeting abstracts of the Physical Society of Japan　63　(2)　752-752　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  160. 21aWF-2 Ultrahigh-resolution ARPES study of CaC_6

    Sugawara K., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　63　(2)　746-746　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  161. 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

  162. 25pRH-9 High-resolution photoemission spectroscopy of heavily B-doped diamond : Electronic structure evolution across metal-insulator transition

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

    Meeting abstracts of the Physical Society of Japan　63　(1)　616-616　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  163. 26pTD-4 Temperature-dependent Fermi surface of In-"1x1"/Si(111)

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

    Meeting abstracts of the Physical Society of Japan　63　(1)　907-907　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  164. 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

  165. 24pYH-5 Band structure of Pb ultra-thin film studied by high-resolution ARPES

    Sun Y.J., Tago Y., Sugawara K., Souma S., Sato T., Zhang Y.F., Xue Q.K., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　63　(1)　723-723　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  166. 24aXK-6 High-resolution ARPES Study of Pb Ultra-thin Film

    Sun Y.J., Tago Y., Sugawara K., Souma S., Sato T., Zhang Y.F., Xue Q.K., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　62　(2)　964-964　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  167. 21aTK-2 High-Resolution ARPES study of 1H-, 5H-.and 6H- CaAISi

    Xiao Y. X., Sugawara K., Souma S., Sato T., Takahashi T., Kamakura N., Kubota M., ono K., Kuroiwa S., Akimitsu J.

    Meeting abstracts of the Physical Society of Japan　62　(2)　718-718　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  168. 21aTK-3 High-resolution ARPES study of ln-"1x1"/Si(111)

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

    Meeting abstracts of the Physical Society of Japan　62　(2)　718-718　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  169. 22aTQ-8 Xenon-plasma-light bulk-sensitive ultrahigh-resolution PES study of low-Tc superconductors

    Souma S., Suwgawra K., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　62　(2)　744-744　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  170. 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

  171. 18aWF-8 Superconducting gap of La_2C_3 : ultrahigh-resolution PES

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

    Meeting abstracts of the Physical Society of Japan　62　(1)　488-488　2007/02/28

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  172. 20pZA-9 ARPES Studies of Metal-Insulator Transition on In(4×1)/Si(111)

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

    Meeting abstracts of the Physical Society of Japan　62　(1)　746-746　2007/02/28

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  173. 18aWF-2 Superstructure-dependence of electronic states in CaAlSi studied by high-Resolution ARPES

    Xiao Y. X, Sugawara K, Nakajima Y, Souma S, Sato T, Takahashi T, Kubota M, Ono K, Kuroiwa S, Akimitsu J

    Meeting abstracts of the Physical Society of Japan　62　(1)　487-487　2007/02/28

    Publisher: 一般社団法人日本物理学会

    ISSN： 1342-8349

  174. グラファイトにおける準粒子とエッジ局在状態

    菅原克明, 佐藤宇史, 高橋隆

    固体物理　42　(12)　903-910　2007

    Publisher: アグネ技術センタ-

    ISSN： 0454-4544

  175. 24pQE-10 Spin-orbit coupling at Bi(111) surface studied by high-resolution ARPES

    Kondo G., Sugawara K., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　61　(2)　588-588　2006/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  176. 23aYH-1 High-resolution ARPES study of As(111)

    Sugawara K., Kondo G., Sato T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan　61　(2)　721-721　2006/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  177. 26aZB-5 Anomaly of π band Fermi surface of graphite : high-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　61　(2)　709-709　2006/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  178. 29pRE-2 Many body interaction of kish graphite studied by ultrahigh-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　61　(1)　753-753　2006/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  179. 28aYB-4 Electronic structure near the Fermi level of Bi(111) studied by ultrahigh-resolution ARPES

    Takahashi T., Sugawara K., Sato T.

    Meeting abstracts of the Physical Society of Japan　61　(1)　879-879　2006/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  180. 19pYD-2 Observation of anisotropic spin-orbit coupling in Sb(111) by high-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　60　(2)　571-571　2005/08/19

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  181. 22pXF-9 High-resolution ARPES study of Sb(111) surface : electron-phonon interaction

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

    Meeting abstracts of the Physical Society of Japan　60　(2)　789-789　2005/08/19

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  182. 22pXF-8 High-resolution ARPES study of Sb(111) surface : band structure and Fermi surface

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

    Meeting abstracts of the Physical Society of Japan　60　(2)　789-789　2005/08/19

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  183. 25aXQ-5 Electron-phonon interaction in Sb(111) surface ; high-resolution ARPES

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

    Meeting abstracts of the Physical Society of Japan　60　(1)　694-694　2005/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  184. 12aXC-2 Band structure and Fermi surface of Sb(111) surface studied by ARPES

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

    Meeting abstracts of the Physical Society of Japan　59　(2)　628-628　2004/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

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Books and Other Publications 6

  1. ポストグラフェン材料の創製と用途開発最前線

    菅原克明, 佐藤宇史, 高橋隆

    エヌ・ティー・エス　2020

  2. グラフェンから広がる二次元物質の新技術と応用

    菅原克明, 佐藤宇史, 高橋隆

    エヌ・ティー・エス　2020

  3. 放射光利用の手引き

    菅原克明, 高橋隆

    アグネ技術センター　2019

  4. カルコゲナイド系層状物質の最新研究

    菅原克明, 高橋隆

    2016

  5. Carbon-based Superconductors: Towards High-Tc Superconductivity

    Katsuaki Sugawara, Takashi Takahashi

    Pan Stanford Pub　2014

  6. グラフェンの機能と応用展望

    菅原克明, 佐藤宇史, 高橋隆

    シーエムシー出版　2009

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Presentations 47

  1. Anomalous charge orders of atomic-layer transition-metal dichalcogenides studied by high-resolution ARPES Invited

    Katsuaki Sugawara

    International Workshop on 2D Materials, Nanjing, CHINA　2023/07/20

  2. MBE法と原子置換法を融合した原子層材料開発と電子物性解明 Invited

    菅原克明

    日本化学会 第１０３回春季大会, 東京理科大学野田キャンパス (千葉)　2023/03/23

  3. Micro-/nano-ARPESによる原子層物質の将来展望 Invited

    菅原克明

    １次元、２次元物質科学の展望と課題, 東北大学, 宮城　2023/03/10

  4. High-resolution ARPES studies of atomic-layer transition-metal dichalcogenides Invited

    Katsuaki Sugawara

    15th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials 16th International Conference on Plasma-Nano Technology & Science, Gifu, JAPAN　2023/03/09

  5. Electronic structure of 2D materials studied by micro-ARPES Invited

    11th International Workshop on 2D Materials, Seoul, KOREA　2023/02/17

  6. マイクロ-ARPESを用いた原子層材料の電子物性開拓 Invited

    菅原克明

    機能性金属錯体懇談会、東京理科大学、千葉　2022/11/26

  7. Robust Mott-insulators of atomic-layer TMDs films studied by ARPES Invited

    Joint Workshop between Tsinghua, SUSTech & AIMR @ Zoom　2022/07/01

  8. High-resolution ARPES studies of atomic-layer Nb-based TMDs Invited

    Katsuaki Sugawara

    The 62nd Fullerenes-Nanotubes-Graphene General Symposium, online　2022/03/04

  9. ARPESによる原子層材料の電子状態イメージング評価 Invited

    菅原克明

    応用物理学会プラズマエレクトロニクス分科会第３６回プラズマ新領域研究会　2022/02/16

  10. High-resolution ARPES studies of Nb based transition-metal dichalcogenides films Invited

    The 12th Recent Progress in Graphene and two-dimensional Materials Research Conference, Korea (Online & Offline Hybrid Conference)　2021/10/13

  11. High-resolution ARPES studies of atomic-layer NbSe2 and NbTe2 films Invited

    1 day Joint Workshop of AIMR and Southern University of Science and Technology　2021/07/21

  12. The electronic state of atomic-layer TMDs studied by high-resolution ARPES Invited

    K. Sugawara

    The 6th International Workshop on 2D Materials　2020/09/25

  13. High-resolution ARPES studies of atomic-layer TMDs controlled crystal structure Invited

    K. Sugawara

    Carrier doping in two-dimensional layered materials　2019/11/04

  14. グラフェン上の遷移金属ダイカルコゲナイド原子層の高分解能ARPES Invited

    菅原克明

    日本物理学会第74回年次大会　2019/03/16

  15. High-resolution ARPES studies of group-V atomic-layer transition metal dichlcogenides Invited

    K. Sugawara

    2nd International Workshop on 2D Materials　2019/02/23

  16. High-resolution ARPES studies of atomic-layer transition metal dichlcogenides Invited

    K. Sugawara

    3RD-JPAN-EU FLAGSHIP WORKSHOP ON GRAPHENE AND RELATED 2D MATERILS　2018/11/18

  17. High-resolution ARPES studies of 2D materials related superconductors Invited

    K. Sugawara

    First International Workshop on 2D Materials　2018/11/16

  18. 遷移金属ダイカルコゲナイド原子層の高分解能ARPES Invited

    菅原克明

    第1回新奇二次元デバイス・物質科学ワークショップ　2018/09/26

  19. Superconducting graphene Invited

    K. Sugawara, T. Takahashi

    12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors　2018/08/23

  20. グラフェン関連原子層超伝導体の高分解能ARPES

    仙台プラズマフォーラム　2017/11/16

  21. グラフェン関連原子層超伝導体の高分解能ARPES

    2017年真空・表面科学合同講演会　2017/08/19

  22. 原子層物質グラフェンの超電導化

    本多記念研究奨励賞記念講演　2017/05/29

  23. 超伝導グラフェンの作製とその電子状態

    日本表面科学会中部支部・日本真空学会東海支部 合同講演会　2017/04/22

  24. 超伝導グラフェンの作製とその電子デバイスへの応用

    ファインケミカルジャパン2017　2017/04/21

  25. グラフェン関連原子層超伝導

    日本物理学会 第72回年次大会　2017/03/19

  26. グラフェン関連原子層超伝導

    グラフェンコンソーシアム 第13回研究講演会　2017/02/06

  27. 高分解能ARPESによるグラフェン関連物質の電子構造研究

    日本物理学会 第70回年次大会　2015/03/21

  28. グラフェンを超える新材料シリセンの基盤電子構造

    関西ナノテクノロジー-カーボンナノ材料研究会-　2015/03/16

  29. High-resolution ARPES studies on the thinnest limit of graphite intercalation compounds International-presentation

    Recent Progress in Graphene Research 2014　2014/09/25

  30. 高分解能ARPESによる2層グラフェン層間化合物の電子状態研究

    ATI 研究報告会　2014/07/18

  31. 原子層物質グラフェンおよび関連化合物の光電子分光

    第 9 回放射光表面顕微ナノ合同シンポジウム　2013/12/26

  32. グラフェン及びグラフェン層間化合物の作成と応用展望

    エレクトロニクス実装学会 2013 年度第 1 回公開研究会　2013/08/21

  33. High-resolution ARPES studied of Ca intercalated bilayer graphene International-presentation

    The 17th International Symposium on Intercalation Compounds　2013/05/15

  34. 原子膜物質の準粒子状態

    日本物理学会 第 68 回年次大会　2013/03/27

  35. 2層グラフェン層間化合物の光電子分光

    平成24年度通研共同プロジェクト グラフェンの精密な界面制御とナノデバイス応用 第一回研究会　2013/02/07

  36. Graphene Intercalation Compounds Studied by High-Resolution ARPES International-presentation

    International Conference on Emerging Advanced Nanomaterials　2012/10/25

  37. グラフェン及びグラフェン層間化合物の光電子分光

    グラフェン研究会　2012/10/04

  38. グラファイト層間化合物の光電子分光

    第3回配列ナノ空間研究会　2012/03/22

  39. グラフェン及びグラフェン層間化合物の光電子分光

    平成23年度表面科学会　2011/12/16

  40. Electronic structure of epitaxial graphene film and related materials studied by high-resolution ARPES International-presentation

    二国間交流事業セミナー　2011/10/25

  41. ARPES studies of monolayer and bilayer graphene International-presentation

    Workshop on Dirac Electron Systems 2011　2011/01/19

  42. SiC 上グラフェンの光電子分光

    日本物理学会 第65回年次大会　2010/03/22

  43. SiC上グラフェンの光電子分光

    第2回九大グラフェン研究会　2010/01/19

  44. SiC 表面に作成したグラフェンの高分解能 ARPES

    物性研究所短期研究会　2009/10/24

  45. Electronic Structure of Graphene and Related Materials Studied by High-Resolution ARPES International-presentation

    Okazaki Conference 2009　2009/02/21

  46. 光電子分光によるグラフェンおよび関連物質の電子構造の解明

    日本物理学会 秋季大会　2008/09/21

  47. V 族半金属表面の超高分解能角度分解光電子分光

    物性研究所短期研究会　2007/07/06

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Research Projects 13

  1. 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

  2. ナノ空間を活用した２.５次元TMDs層間化合物の創生と電子物性解明

    菅原 克明

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 学術変革領域研究(A)

    Institution: 東北大学

    2024/04/01 - 2026/03/31

  3. 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

  4. 電子状態イメージングと第一原理計算を融合した原子層材料のエッジ物性創発

    菅原 克明

    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

    2021/04/01 - 2024/03/31

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    原子層研究が活発化する一方、それらの端(エッジ)構造に依存したエッジ物性は理解されていない。その理由は、原子層材料のエッジ構造制御の困難さと、結晶構造を同定する上で用いられるX線回折などによってエッジ構造物性を同定することの困難さにある。そこで本研究では、MBE法で作製した単原子層薄膜の電子状態をARPESによって可視化(イメージング化)し、ある端構造を持つ原子層構造を定義することで得られる電子状態の理論計算スクリーニングによって、原子層材料の終端構造を特定し、エッジ構造に起因した特異エッジ電子物性を創出が目的である。 初年度目となる本年度は、原子層を作製するための新たなMBE装置の建設を進めた。具体的には、所属研究室で故障し使用されなくなったxyzマニピュレータを独自に修理するとともに加熱装置を設計・製作した。また、原子層材料作製のためのBi・Sb・Te・Se用蒸着源を設置した。さらに、高速反射電子回折装置を設置することで、薄膜成長中の結晶構造評価をリアルタイムが可能にした。 MBE装置の建設を行う最中に、エッジ状態の同定には材料の端に分布するフォノン構造の分光学的測定手法の確立が必須であることが判明した。そこで当初研究計画にはなかったイメージング分光器の導入を行うことで、MBE装置で作製した材料をその場でPLやラマンスペクトルなどの測定が可能となる新たな装置を建設した。 また、エッジ電子状態の特定を目指した第一原理計算プログラムワーキングステーションは、ARPES実験を行いながらリモートで計算が行える研究環境に整えた。PCにはプログラミング言語の一つPythonと一般公開されている第一原理計算プログラムQuantum Espressoを導入することで電子状態や格子振動などの様々な計算が行えるように現在調整を進めている。 次年度からより具体的な研究を進める予定である。

  5. Realization of novel 2D topological insulator materials and its electronic structure analysis by spin-resolved ARPES

    Sugawara Katsuaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    Institution: Tohoku University

    2018/04/01 - 2021/03/31

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    I have fabricated a 2DTI (two-dimensional topological insulator) like Bi monolayer film (called Bismuthene) by using a molecular-beam-epitaxy and characterized the electronic state like Dirac-electron and topological non-trivial edge state by angle-resolved photoemission spectroscopy (ARPES). Firstly, by developing a semiconductor hydrogen-annealing system, I obtained a clean hydrogen-terminated SiC (H-SIC) semiconductor surface. After depositing Bi atoms into H-SiC substrate, I clearly observed not only the superstructure patterns by LEED but also the hole-like dispersive feature by ARPES. These results indicate that we have succeeded in fabricating Bismuthene on H-SiC. In the future, I would clarify the band-gap feature of Dirac electrons and the edge-state in 2DTI. In this study. I also developed a new method for controlling the Dirac electrons by 2DTI heterostructures.

  6. Development of novel atomic layer superconductor based on fermiology by spin-resolved ARPES

    Takahashi Takashi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    Institution: Tohoku University

    2018/04/01 - 2021/03/31

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    In order to improve the efficiency of materials development based on the electronic structure, we have constructed a platform in which an ultrahigh-resolution spin-resolved photoemission spectroscopy system, an atomic layer thin film fabrication MBE system, and a sample evaluation chamber are operated in conjunction with each other under the same ultrahigh vacuum condition. We have fabricated various atomic layer materials and their junctions, such as iron-based high-Tc superconductors, transition metal chalcogenides, high-Tc superconductor hybrids, and topological insulator hybrids. By using the platform, we have immediately observed their electronic structures by ARPES experiments without contamination by exposure to air. Our definitive and accurate experiment has provided much knowledge about the mechanism of high-Tc superconductivity, physical properties of 2D superconductors, and topological superconductivity.

  7. Fabrication of graphene/graphene-nanoribbon superconductors

    Katsuaki Sugawara

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2018/06/29 - 2020/03/31

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    To realize monolayer graphene and graphene-nanoribbon superconductors and the mechanism of superconducting transition, I have fabricated a alkali-metal-coated monolayer graphene and graphene nanoribbon by molecular-beam epitaxy and performed high-resolution angle-resolved photoemission spectroscopy (ARPES). After depositing a potassium atom onto a monolayer graphene substrate, we found not only a folded Dirac-electron state due to a periodic potential of 2x2 superstructure but also a novel free-electron like two-dimensional electron gas. It has been well known that the free-electron like state plays an important rule for a superconductivity in graphite intercalation compounds (GICs). Surprisingly, I found that the folded Dirac-electron state and free-electron like state may be hybridized near the Fermi levels. These results suggests that the superconductivity in the metal coated graphene materials is induced by hybridization between Dirac electron and free-electron like state.

  8. Detection of Meissner effect of surface-superstructure superconductivity by UHV-SQUID

    Hasegawa Shuji, AKIYAMA Ryota, TAKAYAMA Akari, HOBARA Rei, TAKAHASI Takashi, SUGAWARA Katsuaki, HASEGAWA Yukio, Saranin Alexander A., Andrey V. Zotov, Matetskiy Andrey V., ICHINOKURA Satoru, NAKAMURA Tomonori, ENDO Yoshihiro, TOYAMA Haruko, HUANG Hongrui, WATANABE Kazumi, NAKANISHI Ryosuke, HYODO Toshio, MOCHIZUKI Izumi, FUKAYA Yuki

    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: The University of Tokyo

    2016/04/01 - 2019/03/31

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    The experimental definition of superconductivity is required to show both of zero resistance and Meissner effect. In this study we have found some superconducting ultrathin films having atomic-layer thicknesses, but only by the zero-resistance detection. In order to detect the Meissner effect, we have remodeled our world-unique system of micro-four-point probes at sub-Kelvin under vertical magnetic field in ultrahigh vacuum to combine SQUID system. Although it does not yet have enough sensitivity to detect the Meissner effect of mono-atomic-layer superconductivity, we have found several kinds of atomic-layer superconducting material systems. These showed some signatures for unconventional superconductivity beyond the BCS theory.

  9. 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.

  10. Measurements of Novel Quantum Properties of Atomic Layers

    Osada Toshihito, ENDO Akira, SUENAGA Kazutomo, TAEN Toshihiro, SAKAI Ken-ichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Institution: The University of Tokyo

    2013/06/28 - 2018/03/31

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    Improvements of both sample quality by using inactive hexagonal boron nitride substrates and device performance of the scanning transmission electron microscope and the angle-resolved photoemission spectroscopy machine have made it possible to perform dramatically advanced research on electronic properties of atomic layers, which include graphene, new 2D materials, and their stacking composites. The followings remarkable results, leading to the development of atomic layer science, have been obtained; discovery of valley Hall effect in bilayer graphene, discovery of 50 K class high temperature superconductivity in FeSe atomic layers, direct observation of electron orbits in high mobility graphene, clarification of electronic structure of 2D semiconductor black phosphorus, elucidation of electronic structure of graphene multilayers, in situ observation of in-plane growth of graphene, and observation of quantum transport phenomena in epitaxial graphene on a tilted SiC substrate.

  11. Novel physical properties of layer-controlled graphene

    SUGAWARA Katsuaki

    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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    Recently, monolayer graphite (graphene) with Dirac electrons has attracted much attention because it shows various interesting physical properties. On the other hands, the detailed electronic structure depended on the number of layers in graphene related materials has not been well understood yet. In this work, I have fabricated the thinnest limit of graphite intercalation compounds (intercalated bilayer graphene) and elucidated its electronic structures by high-resolution ARPES. In Ca intercalated bilayer graphene, I clearly observe the interlayer band responsible for superconductor in bulk GICs, suggest that Ca intercalated bilayer graphene also may show the 2-dimentional superconductivity. Additionally, I find the substrate-induced charge density wave in π band on Ca intercalated bilayer graphene.

  12. Band structure controlling of graphene studied by ultrahigh-resolution angle-resolved photoemission spectroscopy

    SUGAWARA Katsuaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Research Activity Start-up

    Institution: Tohoku University

    2009 - 2010

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    Recently, monolayer graphite (graphene)have attracted much attention because it shows various interesting physical properties. However, the detailed electronic responsible for the anomalous physical properties in graphene depended the number of layers has not been well understood yet. To elucidate the anomalous physical properties of graphene, we have performed high-resolution angle-resolved photoemission spectroscopy (ARPES)of monolayer and bilayer graphene on SiC (0001). We clearly observed the band structure deviated from ideal graphene on both monolayer and bilayer graphene growth on SiC (0001). These experimental results are explained in terms of the buffer layer.

  13. 超高分解能スピン分解光電子分光装置の建設と低次元ナノ電子系の微細電子構造の研究

    菅原 克明

    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 - 2008

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    これまで低次元ナノ電子系は、金属絶縁体転移、スピンパイエルス転移、超伝導転移など興味ある研究がなされてきた。現在ではこれらの特異物性のみならず、ナノスケールにおけるデバイスへの応用、さらには新たなスピンの自由度を応用したスピントロニクスの分野として精力的な研究がなされている。そのため、ナノスケールの試料を独自に作成し、それを電子状態の立場から試料評価し、さらには電子状態から判明される新たな特異物性を明らかにする上で、スピンの情報を得る事が可能となる「超高分解能スピン分解光電子分光装置」の建設が重要である。 本年度は、高分解能角度分解光電子分光装置に設置できるコンパクトサイズの高感度小型モット検出器の建設・設置を行った。この小型モット検出器を用いることによって、スピンの情報を得る事が可能となる。設置当初、小型モット検出器内部において放電によるノイズの増加の問題が発生したが、その内部構造や光電子検出部の改良を行い、ノイズの問題を解決した。また、小型モット検出器の調整のために、建設した試料作成装置を用いて新たにSi半導体表面上でV族半金属Bi薄膜作成を行った。その結果、非常に良質なBi薄膜の作成に成功し、薄膜の厚さをナノメータスケールで制御する事を可能にした。この表面を用いて、現在も引き続き超高分解能スピン分解光電子分光装置の調整を行っている。また前年度から、スピントロニクスへの応用が期待され始めたグラファイトの研究に着手しており、本年度では、磁性/超伝導といった様々な物性制御が行えるグラファイト層間化合物の研究を行った。その結果、超伝導転移を示すグラファイト層間化合物において、超伝導転移に重要な役目する電子は層間電子であることを光電子分光で明らかにした。

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Social Activities 21

  1. 第41回全国高等学校総合文化祭みやぎ総文2017

    2017/08 -

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    研究活動についての紹介と実験公開

  2. トーキン科学技術賞

    2017/03/15 -

  3. 第58回本多記念賞決定

    2017/03/03 -

  4. 正八面体構造のセレン化二オブ原子層薄膜作製成功

    2016/11/18 -

  5. 同一元素で金属/半導体

    2016/11/16 -

  6. 金属と半導体 作り分け

    2016/11/10 -

  7. 超伝導グラフェン

    2016/03/08 -

  8. グラフェンの超伝導化成功

    2016/02/19 -

  9. グラフェンを超伝導状態に

    2016/02/08 -

  10. シート状炭素分子グラフェン カルシウムを加え半導体に

    2015/04/10 -

  11. グラフェン電子制御

    2015/04/10 -

  12. シリセンの基盤電子構造解明 東北大、豊田中央研の研究グループ成功 グラフェン超える新機能開拓に道

    2015/01/23 -

  13. ２層グラフェン層間化合物で強い電子フォノン相互作用

    2015/01/23 -

  14. シリセンの電子構造解明 電気特性グラフェン上回る

    2014/12/29 -

  15. 仙台市立富沢中学校の職場体験学習

    2014/11 -

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    研究内容や研究生活などに関するインタビュー

  16. 高い電気伝導性持つ３次元グラフェン開発 東北大 ３次元デバイス開発に期待

    2014/04/25 -

  17. “２層グラフェン層間化合物”東北大の研究グループ作製に成功

    2012/11/23 -

  18. 極薄グラフェン サンドイッチ構造 東北大、電池高性能に道

    2012/11/06 -

  19. グラフェン層間化合物 金属原子挟み作成 電池充電時間短縮に道 高効率で小型化実現へ

    2012/11/06 -

  20. リチウム原子挟む化合物作製に成功 東北大、小型電池に応用

    2012/11/06 -

  21. 鉛筆の芯がリニアモーターカー走らす？ 黒鉛の超電導体 メカニズム解明

    2008/11/14 -

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Media Coverage 1

  1. 未来の起源〜若き研究者たちの挑戦〜

    TBS

    2015/07

    Type: TV or radio program

Other 3

  1. 新規物性開拓を目指した遷移金属ダイカルコゲナイド原子層の結晶構造制御法の確立

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    本申請研究では、様々な機能性を持つTMDs原子層の配向性を含めた結晶構造の制御法確立によって、TMDs機能性材料を用いた「原子層エレクトロニクス」開発への新たな指針を示すことを目的とする。

  2. 遷移金属カルコゲナイド原子層材料開発および新規物性開拓

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    近年、層状物質グラファイトを原子層化した際のディラック粒子の発見によって、様々な層状物質の原子層化による新規物性研究が行われている。本研究では、これまで本研究者が培ってきた分子線エピタキシー技術を用いて様々なセレン系遷移金属カルコゲナイド原子層を作成し、それらの電子状態を角度分解光電子分光によって直接観測することで、原子層化による新規物性解明と機能性材料開発に向けた指針を得ることを目的とする。

  3. 2層グラフェン層間化合物の新規物性解明

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    グラファイト層間化合物は、多彩な物性を示すため基礎/応用研究が盛んに行われてきた。しかしながら、極限まで薄くした２層グラフェン層間化合物は積層数制御の困難さのため報告例がなく、基礎物性に関しては未解明である。そこで本研究では、電子状態を直接決定することが可能な角度分解光電子分光を用いて、作成した２層グラフェン層間化合物における特異物性を電子状態から解明することを目的とする。