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Rashba-type spin-orbit interaction in quasi-liquid layers on heavy-element crystal surfaces

Research Project

Project/Area Number 17K18757
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics and related fields
Research InstitutionOsaka University

Principal Investigator

Ohtsubo Yoshiyuki  大阪大学, 生命機能研究科, 助教 (70735589)

Project Period (FY) 2017-06-30 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywordsスピン軌道相互作用 / 液体金属 / 角度分解光電子分光 / 低速電子回折 / トポロジカル相転移 / トポロジカル絶縁体 / 擬似液体層(QLL) / 表面電子状態 / トポロジカル表面状態 / 擬似液体層 / Rashba効果
Outline of Final Research Achievements

In this study, I tried to reveal the role of spin-orbit interaction in the electronic structure of liquid metals. On this purpose, Quasi-Liquid layers of the heavy-element crystals, which is expected to appear slightly below the melting point of the 3D crystals, and its spin and orbital polarization structures were searched by electron diffraction and photoelectron spectroscopy.
Although the target material, single crystal of Bismuth, did not show any signature of QLL even at the melting point, the new, unexpected change in the surface electronic structure indicating temperature-driven topological phase transition was discovered.

Academic Significance and Societal Importance of the Research Achievements

本研究では当初予定していた液体金属相の電子状態の追跡は残念ながら困難だったが、一方で研究開始当初は全く予測していなかった温度変化によるトポロジカル相転移を示す電子状態の変化を見出した。温度によるトポロジカル相転移と、それに伴う熱流・スピン流のエネルギー変換技術は持続可能な社会発展に際してスピントロニクス技術が貢献を期待される分野の一つであり、本研究では当初意図した内容とは異なってしまったものの、有意義な新しい知見を得ることができたと考える。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (25 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (2 results) Journal Article (10 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 10 results,  Open Access: 4 results) Presentation (12 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results) Remarks (1 results)

  • [Int'l Joint Research] Synchrotron SOLEIL(フランス)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Synchrotron SOLEIL(フランス)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Non-trivial surface states of samarium hexaboride at the (111) surface2019

    • Author(s)
      Ohtsubo Yoshiyuki、Yamashita Yuki、Hagiwara Kenta、Ideta Shin-ichiro、Tanaka Kiyohisa、Yukawa Ryu、Horiba Koji、Kumigashira Hiroshi、Miyamoto Koji、Okuda Taichi、Hirano Wataru、Iga Fumitoshi、Kimura Shin-ichi
    • Journal Title

      Nature Communications

      Volume: 10 Issue: 1

    • DOI

      10.1038/s41467-019-10353-3

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of finite-range interactions on the one-electron spectral properties of one-dimensional metals: Application to Bi/InSb(001)2019

    • Author(s)
      Carmelo Jose M. P.、Cadez Tilen、Ohtsubo Yoshiyuki、Kimura Shin-ichi、Campbell David K.
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 3

    • DOI

      10.1103/physrevb.100.035105

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Optical and photoelectrical studies on anisotropic metal-insulator transition of RuAs2019

    • Author(s)
      Nakajima Yuki、Mita Zenjiro、Watanabe Hiroshi、Ohtsubo Yoshiyuki、Ito Takahiro、Kotegawa Hisashi、Sugawara Hitoshi、Tou Hideki、Kimura Shin-ichi
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 12

    • DOI

      10.1103/physrevb.100.125151

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fermi level tuning of one-dimensional giant Rashba system on a semiconductor substrate: Bi/GaSb(110)-(2×1)2019

    • Author(s)
      T. Nakamura, Y. Ohtsubo, N. Tokumasu, P. Le Fevre, F. Bertran, S. Ideta, K. Tanaka, K. Kuroda, K. Yaji, A. Harasawa, S. Shin, F. Komori , S. Kimura
    • Journal Title

      Physical Review Materials

      Volume: 3 Issue: 12 Pages: 126001-126001

    • DOI

      10.1103/physrevmaterials.3.126001

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Temperature-driven modification of surface electronic structure on bismuth, a topological border material2019

    • Author(s)
      Ohtsubo Y、Yamashita Y、Kishi J、Ideta S、Tanaka K、Yamane H、Rault J E、Le F?vre P、Bertran F、Kimura S
    • Journal Title

      Journal of Physics D: Applied Physics

      Volume: 52 Issue: 25 Pages: 254002-254002

    • DOI

      10.1088/1361-6463/ab1515

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Surface electronic structure of SmB 6 (111)2018

    • Author(s)
      Y. Ohtsubo, K. Hagiwara, C. Wang, R. Yukawa, K. Horiba, H. Kumigashira, W. Hirano, F. Iga, S. Kimura
    • Journal Title

      Physica B: Condensed Matter

      Volume: 536 Pages: 75-77

    • DOI

      10.1016/j.physb.2017.09.033

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Infrared Evaluation of Enantiometric Amount and Application to Racemization at the Interface Between L- and D-Alanine2018

    • Author(s)
      Kamei Shun、Hibi Jigen、Ohtsubo Yoshiyuki、Watanabe Hiroshi、Kimura Shin-ichi
    • Journal Title

      Applied Spectroscopy

      Volume: 72 Issue: 7 Pages: 1074-1079

    • DOI

      10.1177/0003702818770575

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Giant Rashba splitting of quasi-one-dimensional surface states on Bi/InAs(110)-(2×1)2018

    • Author(s)
      Nakamura Takuto、Ohtsubo Yoshiyuki、Yamashita Yuki、Ideta Shin-ichiro、Tanaka Kiyohisa、Yaji Koichiro、Harasawa Ayumi、Shin Shik、Komori Fumio、Yukawa Ryu、Horiba Koji、Kumigashira Hiroshi、Kimura Shin-ichi
    • Journal Title

      Physical Review B

      Volume: 98 Issue: 7 Pages: 075431-075431

    • DOI

      10.1103/physrevb.98.075431

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Surface electronic states of Au-induced nanowires on Ge(001)2018

    • Author(s)
      Yaji Koichiro、Yukawa Ryu、Kim Sunghun、Ohtsubo Yoshiyuki、Le Fevre Patrick、Bertran Francois、Taleb-Ibrahimi Amina、Matsuda Iwao、Nakatsuji Kan、Shin Shik、Komori Fumio
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 30 Issue: 7 Pages: 075001-075001

    • DOI

      10.1088/1361-648x/aaa526

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spin-polarized quasi-one-dimensional state with finite band gap on the Bi/InSb(001) surface2017

    • Author(s)
      Kishi J.、Ohtsubo Y.、Nakamura T.、Yaji K.、Harasawa A.、Komori F.、Shin S.、Rault J. E.、Le Fevre P.、Bertran F.、Taleb-Ibrahimi A.、Nurmamat M.、Yamane H.、Ideta S.、Tanaka K.、Kimura S.
    • Journal Title

      Physical Review Materials

      Volume: 1 Issue: 6

    • DOI

      10.1103/physrevmaterials.1.064602

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ARPES studies on topological Kondo insulators: electronci states of in-situ prepared SmB6 and YbB12 surfaces2020

    • Author(s)
      Y. Ohtsubo
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Temperature-driven topological phase transition proposed from surface electronic structure of bismuth, a topological border material2019

    • Author(s)
      Y. Ohtsubo, Y. Yamashita, J. Kishi, S. Ideta, K. Tanaka, H. Yamane, J. E. Rault, F. Bertran, P. Le Fevre, S. Kimura
    • Organizer
      The 40th International Conference on Vacuum Ultaraviolet and X-ray Physics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] New Surface Atomic Structures on the Topological Kondo Insulator SmB62019

    • Author(s)
      Y. Ohtsubo, P. Xie, R. Yukawa, K. Horiba, H. Kumigashira, S. Ideta, K. Tanaka, K. Miyamoto, T. Okuda, W. Hirano, F. Iga, S. Kimura
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bi/GaSb(110)-(2×1)表面電子状態の金属化と原子構造変化2019

    • Author(s)
      大坪嘉之, 中村拓人, 山下雄紀, 出田真一郎, 田中清尚, 木村真一
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Quasi 1D surface electronic states with spin-orbit interaction2018

    • Author(s)
      Yoshiyuki Ohtsubo
    • Organizer
      International Conference on Electronic Spectroscopy and Structure
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Giant Rashba-type spin-split electronic states in quasi-1D surface system2018

    • Author(s)
      Y. Ohtsubo, T. Nakamura, Y. Yamashita, K. Yaji, A. Harasawa, S. Shin, F. Komori, R. Yukawa, K. Horiba, H. Kumigashira, S. Kimura
    • Organizer
      Magnetic Single Nano-Object Workshop & School
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Topological surface states of the Kondo insulator SmB6 unveiled from the new crystal orientation2018

    • Author(s)
      Y. Ohtsubo, Y. Yamashita, K. Hagiwara, S. Ideta, K. Tanaka, R. Yukawa, K. Horiba, H. Kumigashira, K. Miyamoto, T. Okuda, W. Hirano, F. Iga, S. Kimura
    • Organizer
      International Workshop on Trends in Advanced Spectroscopy in Materials Science
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 表面電子状態から探るビスマス単結晶のトポロジカル秩序2018

    • Author(s)
      大坪嘉之
    • Organizer
      ISSPワークショップ:スピン軌道強結合伝導系におけるサイエンスの新展開
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] InAs(110)表面上の擬一次元的Biにおける異方的Rashba効果2018

    • Author(s)
      中村拓人, 大坪嘉之, 山下雄紀, 出田真一郎, 田中清尚, 矢治光一郎, 原沢あゆみ, 小森文夫, 辛埴, 木村真一, 湯川龍, 堀場弘司, 組頭広志
    • Organizer
      日本物理学会
    • Related Report
      2017 Research-status Report
  • [Presentation] SmB6(111)表面電子状態のスピン偏極構造2018

    • Author(s)
      山下雄紀, 大坪嘉之, 湯川龍, 堀場弘司, 組頭広志, 宮本幸治, 奥田太一, 平野航, 伊賀文俊, 木村真一
    • Organizer
      日本物理学会
    • Related Report
      2017 Research-status Report
  • [Presentation] 固体表面の低次元電子状態における特異な電子相関現象2018

    • Author(s)
      大坪嘉之
    • Organizer
      日本放射光学会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Bi(111)表面電子状態の温度依存性とトポロジカル相転移の可能性2017

    • Author(s)
      大坪嘉之, 岸潤一郎, 山下雄紀, 山根宏之, 出田真一郎, 田中清尚, 木村真一
    • Organizer
      日本物理学会
    • Related Report
      2017 Research-status Report
  • [Remarks] 目線を変えて解決へ。複雑に見える電子の状態を単純化―近藤効果とトポロジーの共存を明確に―

    • URL

      https://www.sci.osaka-u.ac.jp/ja/topics/7519/

    • Related Report
      2019 Annual Research Report

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Published: 2017-07-21   Modified: 2021-02-19  

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