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2021 Fiscal Year Annual Research Report

トポロジカル超伝導体の量子応答

Research Project

Project/Area Number 20H00131
Research InstitutionKyoto University

Principal Investigator

佐藤 昌利  京都大学, 基礎物理学研究所, 教授 (30313117)

Co-Investigator(Kenkyū-buntansha) 田仲 由喜夫  名古屋大学, 工学研究科, 教授 (40212039)
柏谷 聡  名古屋大学, 工学研究科, 教授 (40356770)
Project Period (FY) 2020-04-01 – 2023-03-31
Keywordsトポロジカル超伝導
Outline of Annual Research Achievements

トポロジカル超伝導体のトポロジカル場の理論を構築し、それにより電気磁気応答を議論した。また、超伝導体の表面にトポロジカルなエッジ状態が存在する場合には、異常近接効果の性質が本質的に変わることを明らかにした。更に、Sr2RuO4で最近提案されている多軌道超伝導体モデルのスピン帯磁率の計算を行い、Tc以下で減少することを示した。また、d波超伝導体表面のゼロエネルギーアンドレーエフ束縛状態を研究し、 表面近傍に時間反転対称性を破るスピン3重項p波のクーパー対が誘起されると仮定した場合の方が、s波が誘起されると仮定した場合よりも、より実験結果に近いdI/dV特性を得ることを示した。また、トポロジカル超伝導の界面に誘起される奇周波数ペアとバルクのハミルトニアンで定義される拡張されたトポロジカル不変量の間の関係である「スペクトラルバルクエッジ対応」の概念が、カイラル対称性が存在しない場合にも拡張できることを示した。トポロジカル絶縁体に磁性ドープを行った磁性トポロジカル絶縁体BiSbTe2Seに関して、磁性起源によるギャップの形成(55meV程度)をトンネル分光法により確認した。また、イオン液体を用いたドーピングにより輸送特性の変化を観測し、2バンドモデルにより解析した結果、フェルミ面が磁気ギャップ内に存在することを示唆する結果を得た。これはこのトポロジカル絶縁体上に超伝導体を接合することによりマヨラナ準粒子を発生させることが可能であることを示しており、マヨラナ準粒子を介したトポロジカルジョセフソン接合への重要なステップである。その他、トポロジカル超伝導体に散逸の効果を取り入れる際に重要となる非エルミートトポロジカル相の基礎的な結果を得ることに成功した。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

トポロジカル超伝導体の接合を中心に基礎的な理論計算を行っており、将来の実験の進展に伴って着実に研究を進めることができた。

Strategy for Future Research Activity

トポロジカル超伝導体の量子応答に関する一般的理論の構築を進めるとともに、実験の方の進展を図る。また、研究成果の発信に努める。

  • Research Products

    (31 results)

All 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (16 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 16 results,  Open Access: 4 results) Presentation (11 results) (of which Int'l Joint Research: 7 results,  Invited: 5 results) Book (1 results)

  • [Int'l Joint Research] Stockholm University(スウェーデン)

    • Country Name
      SWEDEN
    • Counterpart Institution
      Stockholm University
  • [Int'l Joint Research] William & Mary/Stony Brook University/University of Illinois(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      William & Mary/Stony Brook University/University of Illinois
  • [Int'l Joint Research] Max-Planck-Institute/University of Greifswald(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      Max-Planck-Institute/University of Greifswald
  • [Journal Article] Spin susceptibility for orbital-singlet Cooper pair in the three-dimensional Sr2RuO4 superconductor2022

    • Author(s)
      Fukaya Yuri、Hashimoto Tatsuki、Sato Masatoshi、Tanaka Yukio、Yada Keiji
    • Journal Title

      Physical Review Research

      Volume: 4 Pages: 013135

    • DOI

      10.1103/PhysRevResearch.4.013135

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Extrinsic topology of Floquet anomalous boundary states in quantum walks2022

    • Author(s)
      Bessho Takumi、Mochizuki Ken、Obuse Hideaki、Sato Masatoshi
    • Journal Title

      Physical Review B

      Volume: 105 Pages: 094306

    • DOI

      10.1103/PhysRevB.105.094306

    • Peer Reviewed
  • [Journal Article] Simplification of the Local Full Vertex in the Impurity Problem in DMFT and Its Applications for the Nonlocal Correlation2022

    • Author(s)
      Mizuno Ryota、Ochi Masayuki、Kuroki Kazuhiko
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Pages: 034002

    • DOI

      10.7566/JPSJ.91.034002

    • Peer Reviewed
  • [Journal Article] Electromagnetic response of topological superconductors2021

    • Author(s)
      Stalhammar M.、Stone M.、Sato Masatoshi、Hansson T. H.
    • Journal Title

      Physical Review B

      Volume: 103 Pages: 235427

    • DOI

      10.1103/PhysRevB.103.235427

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Non-Hermitian higher-order Dirac semimetals2021

    • Author(s)
      Ghorashi Sayed Ali Akbar、Li Tianhe、Sato Masatoshi、Hughes Taylor L.
    • Journal Title

      Physical Review B

      Volume: 104 Pages: L161116

    • DOI

      10.1103/PhysRevB.104.L161116

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Non-Hermitian higher-order Weyl semimetals2021

    • Author(s)
      Ghorashi Sayed Ali Akbar、Li Tianhe、Sato Masatoshi
    • Journal Title

      Physical Review B

      Volume: 104 Pages: L161117

    • DOI

      10.1103/PhysRevB.104.L161117

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nielsen-Ninomiya Theorem with Bulk Topology: Duality in Floquet and Non-Hermitian Systems2021

    • Author(s)
      Bessho Takumi、Sato Masatoshi
    • Journal Title

      Physical Review Letters

      Volume: 127 Pages: 196404

    • DOI

      10.1103/PhysRevLett.127.196404

    • Peer Reviewed
  • [Journal Article] Anomalous inverse proximity effect in unconventional superconductor junctions2021

    • Author(s)
      Suzuki Shu-Ichiro、Hirai Takashi、Eschrig Matthias、Tanaka Yukio
    • Journal Title

      Physical Review Research

      Volume: 3 Pages: 043148

    • DOI

      10.1103/PhysRevResearch.3.043148

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Possible topological phases in quantum anomalous Hall insulator/unconventional superconductor hybrid systems2021

    • Author(s)
      Ohashi Ryoi、Kobayashi Shingo、Tanaka Yukio
    • Journal Title

      Physical Review B

      Volume: 104 Pages: 134518

    • DOI

      10.1103/PhysRevB.104.134518

    • Peer Reviewed
  • [Journal Article] Generalization of spectral bulk-boundary correspondence2021

    • Author(s)
      Tamura Shun、Hoshino Shintaro、Tanaka Yukio
    • Journal Title

      Physical Review B

      Volume: 104 Pages: 165125

    • DOI

      10.1103/PhysRevB.104.165125

    • Peer Reviewed
  • [Journal Article] Proposal for identifying possible even-parity superconducting states in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> using planar tunneling spectroscopy2021

    • Author(s)
      Ikegaya Satoshi、Suzuki Shu-Ichiro、Tanaka Yukio、Manske Dirk
    • Journal Title

      Physical Review Research

      Volume: 3 Pages: L032062

    • DOI

      10.1103/PhysRevResearch.3.L032062

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Theory of a pair density wave on a quasi-one-dimensional lattice in the Hubbard model2021

    • Author(s)
      Yoshida Soma、Yada Keiji、Tanaka Yukio
    • Journal Title

      Physical Review B

      Volume: 104 Pages: 094506

    • DOI

      10.1103/PhysRevB.104.094506

    • Peer Reviewed
  • [Journal Article] Optical Responses of Chiral Majorana Edge States in Two-Dimensional Topological Superconductors2021

    • Author(s)
      He James Jun、Tanaka Yukio、Nagaosa Naoto
    • Journal Title

      Physical Review Letters

      Volume: 126 Pages: 237002

    • DOI

      10.1103/PhysRevLett.126.237002

    • Peer Reviewed
  • [Journal Article] Tunneling conductance of the (d+ip)-wave superconductor2021

    • Author(s)
      Takabatake Yuhi、Suzuki Shu-Ichiro、Tanaka Yukio
    • Journal Title

      Physical Review B

      Volume: 103 Pages: 184515

    • DOI

      10.1103/PhysRevB.103.184515

    • Peer Reviewed
  • [Journal Article] Edge-induced pairing states in a Josephson junction through a spin-polarized quantum anomalous Hall insulator2021

    • Author(s)
      Nakai Ryota、Nomura Kentaro、Tanaka Yukio
    • Journal Title

      Physical Review B

      Volume: 103 Pages: 184509

    • DOI

      10.1103/PhysRevB.103.184509

    • Peer Reviewed
  • [Journal Article] Magnetic Gap of Fe-Doped BiSbTe2Se Bulk Single Crystals Detected by Tunneling Spectroscopy and Gate-Controlled Transports2021

    • Author(s)
      Yano Rikizo、Kudriashov Andrei、Hirose Hishiro T.、Tsuda Taiki、Kashiwaya Hiromi、Sasagawa Takao、Golubov Alexander A.、Stolyarov Vasily S.、Kashiwaya Satoshi
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 12 Pages: 4180~4186

    • DOI

      10.1021/acs.jpclett.1c00869

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Criteria for topological superconductivity and applications2022

    • Author(s)
      M. Sato
    • Organizer
      Invited in Tutorial session of America Physical Society March Meeting 2022, online
    • Int'l Joint Research / Invited
  • [Presentation] Non-Hermitian Topological Phases2021

    • Author(s)
      M. Sato
    • Organizer
      Soul National University, Korea
    • Invited
  • [Presentation] Electromagnetic response of topological superconductors2021

    • Author(s)
      M. Sato
    • Organizer
      KEK seminar,
    • Invited
  • [Presentation] Non-Hermitian Topological Phases2021

    • Author(s)
      M. Sato
    • Organizer
      Osaka University seminar
    • Invited
  • [Presentation] Odd-frequnecy pairing in topological superconductors2021

    • Author(s)
      Y. Tanaka
    • Organizer
      Department of Electrophysics of National Yang Ming Chiao Tung University
    • Invited
  • [Presentation] Magnetically Doped Three Dimensional Topological Insulator and its Superconducting Proximity Effects2021

    • Author(s)
      R. Yano, V. S. Stolyarov, H. T. Hirose ,K. Tsumura, M. Yamamoto, Y. Tanaka, H. Kashiwaya, Y. Asano, T. Sasagawa, S. Kashiwaya
    • Organizer
      The 12th International Conference on the Science and Technology for Advanced Ceramics (STAC-12)
    • Int'l Joint Research
  • [Presentation] Field Effects of Pd Doped CaAgP as a Nodal-Line semimetal2021

    • Author(s)
      Shota Nagasaka, Rikizo Yano, Kazushige Saigusa, Yoshihiko Okamoto, Koshi Takenaka, and Satoshi Kashiwaya
    • Organizer
      The 12th International Conference on the Science and Technology for Advanced Ceramics (STAC-12)
    • Int'l Joint Research
  • [Presentation] Surface Transport Properties of Magnetically-Doped Three-Dimensional Topological Insulator Fe-BiSbTe2Se2021

    • Author(s)
      Tsuyoshi Tanda, Rikizo Yano, Hishiro T. Hirose, Takao Sasagawa, and Satoshi Kashiwaya
    • Organizer
      The 12th International Conference on the Science and Technology for Advanced Ceramics (STAC-12)
    • Int'l Joint Research
  • [Presentation] Unusual Proximity Effect on a Magnetic Topological Insulator Tuned by Magnetization2021

    • Author(s)
      R. Yano, M. Yamamoto, K. Tsumura, H. T. Hirose , S. Tamura, H. Kashiwaya, V. S. Stolyarov, Y. Tanaka, T. Sasagawa, S. Kashiwaya
    • Organizer
      Bound states in hybrid superconductor nanostructures: CMD 29 online series (Jointly organized by the IOP and EPS)
    • Int'l Joint Research
  • [Presentation] Magnetically Doped Topological Insulator and its Superconducting Proximity Effects2021

    • Author(s)
      R. Yano, V. S. Stolyarov, H. T. Hirose, K. Tsumura, M. Yamamoto, H. Kashiwaya, T. Sasagawa, S. Kashiwaya
    • Organizer
      International Conference on Materials and Systems for Sustainability (ICMaSS2021)
    • Int'l Joint Research
  • [Presentation] Transport Properties of the Sr2RuO4/Ru/Nb Josephson Junction2021

    • Author(s)
      Takahiro Yamada, Rikizo Yano, Shingo Yonezawa, Shahbaz Anwar, Yoshiteru Maeno, Satoshi Kashiwaya
    • Organizer
      Oxide Superspin (OSS2021) Workshop, Kyoto Japan
    • Int'l Joint Research
  • [Book] 超伝導接合の物理2021

    • Author(s)
      田仲 由喜夫
    • Total Pages
      356
    • Publisher
      名古屋大学出版会
    • ISBN
      978-4-8158-1028-3

URL: 

Published: 2023-12-25  

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