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強相関電子系における物質相としてのトポロジカル超伝導

Research Project

Project/Area Number 17J10588
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Condensed matter physics II
Research InstitutionKyoto University

Principal Investigator

大同 暁人  京都大学, 理学研究科, 特別研究員(DC1)

Project Period (FY) 2017-04-26 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2019: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2018: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2017: ¥900,000 (Direct Cost: ¥900,000)
Keywordsトポロジカル超伝導 / バルクエッジ対応 / 多極子 / 非共型トポロジカル超伝導 / トポロジカル相 / 強相関電子系 / 重い電子系 / 非共型対称性
Outline of Annual Research Achievements

本研究課題では,トポロジカル超伝導体の候補物質が現在非常に限られていることを背景として,特に強相関電子系においてトポロジカル超伝導体を発見すること・およびそれを検証することを目的としている.最終年度である本年度では,前年度までに得られた研究成果のまとめを行うとともに,それらをさらに発展させることを試みた.強磁性超伝導体UCoGeにおけるメビウス型トポロジカル超伝導の提案,1次元トポロジカル超伝導における新規バルクエッジ対応の証明について,それぞれ論文として出版した.また,最近超伝導相が新しく発見された重い電子系超伝導体UTe2について共同研究を行った.この超伝導体はスピン三重項超伝導であると考えられているため,奇パリティの超伝導対称性と第一原理計算によって得たフェルミ面を組み合わせることでトポロジカル超伝導を予言することができる.その結果,中間的な強さの相互作用に対してUTe2はトポロジカル超伝導になることが分かった.この成果についても論文として出版済みである.以上に得られた成果は本研究課題の目的達成に向け,大きな貢献をするものだと考えている.
また,前年度に引き続き物質中の多極子,特に電気四極子の定式化に向けた研究を行った.これはバルクエッジ対応とも関連する概念であるほか,電子ネマティック相をはじめとしたエキゾチックな物質相を記述する秩序変数として利用可能であると期待される.本成果については論文投稿準備中である.

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (28 results)

All 2019 2018 2017

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (23 results) (of which Int'l Joint Research: 10 results,  Invited: 1 results)

  • [Journal Article] Chirality polarizations and spectral bulk-boundary correspondence2019

    • Author(s)
      Akito Daido and Youichi Yanase
    • Journal Title

      Phys. Rev. B

      Volume: 100 Issue: 17 Pages: 174512-174512

    • DOI

      10.1103/physrevb.100.174512

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Insulator-metal transition and topological superconductivity in UTe2 from a first-principles calculation2019

    • Author(s)
      Jun Ishizuka, Shuntaro Sumita, Akito Daido, Youichi Yanase
    • Journal Title

      Phys. Rev. Lett.

      Volume: 123 Issue: 21 Pages: 217001-217001

    • DOI

      10.1103/physrevlett.123.217001

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Efficient method to compute Z4-indices with glide symmetry and applications to M\"obius materials, CeNiSn and UCoGe2019

    • Author(s)
      Tsuneya Yoshida, Akito Daido, Norio Kawakami, and Youichi Yanase
    • Journal Title

      Phys. Rev. B

      Volume: 99 Issue: 23 Pages: 235105-235105

    • DOI

      10.1103/physrevb.99.235105

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Z4 Topological Superconductor UCoGe2019

    • Author(s)
      Akito Daido, Tsuneya Yoshida, Youichi Yanase
    • Journal Title

      Phys. Rev. Lett.

      Volume: 122 Issue: 22 Pages: 227001-227001

    • DOI

      10.1103/physrevlett.122.227001

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Theory of spin magnetic quadrupole moment and temperature-gradient-induced magnetization2019

    • Author(s)
      Atsuo Shitade, Akito Daido, and Youichi Yanase
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 2 Pages: 024404-024404

    • DOI

      10.1103/physrevb.99.024404

    • NAID

      130008152283

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] カイラリティ分極としての表面気周波数Cooper対2019

    • Author(s)
      大同暁人
    • Organizer
      電子相関が生み出す超伝導現象の未解決問題と新しい潮流
    • Related Report
      2019 Annual Research Report
  • [Presentation] UCoGeの常磁性超伝導相におけるトポロジカル超伝導2019

    • Author(s)
      大同暁人
    • Organizer
      J-Physics地域研究会ー仙台
    • Related Report
      2019 Annual Research Report
  • [Presentation] Chirarity polarization and spectral bulk-boundary correspondence2019

    • Author(s)
      Akito Daido
    • Organizer
      Trends in Theory of Correlated Materials TTCM2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Surface odd-frequency Cooper pairs as polarization of chirality2019

    • Author(s)
      Akito Daido
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Nonsymmorphic Topological Superconductivity in the Paramagnetic Superconducting Phase of UCoGe2019

    • Author(s)
      Akito Daido
    • Organizer
      Research Frontier of Advanced Spectroscopies for Correlated Electron Systems
    • Related Report
      2019 Annual Research Report
  • [Presentation] 電気分極とのアナロジーによるスペクトルバルクエッジ対応の証明2019

    • Author(s)
      大同暁人,柳瀬陽一
    • Organizer
      日本物理学会年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 格子ブリルアンゾーンにおけるメビウストポロジカル相の特徴づけーFukui-Hatsugai公式の拡張ー2019

    • Author(s)
      吉田恒也,大同暁人,川上則雄,柳瀬陽一
    • Organizer
      日本物理学会年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Z4 Topological Crystalline Superconductivity in UCoGe under pressure2018

    • Author(s)
      Akito Daido
    • Organizer
      12th International Conference on Materials and Mechanisms of Superconductivity and High Temperatures Superconductors
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] UCoGeにおけるZ4トポロジカル結晶超伝導2018

    • Author(s)
      大同暁人
    • Organizer
      電子相関が生み出す新規な秩序と超伝導現象:トポロジー,液晶状態,動的現象
    • Related Report
      2018 Annual Research Report
  • [Presentation] Local Magnetic Quadrupole Moments in Insulators2018

    • Author(s)
      Akito Daido
    • Organizer
      Topological Phases and Functionality of Correlated Electron Systems
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Z4 Topological crystalline superconductivity in UCoGe2018

    • Author(s)
      Akito Daido
    • Organizer
      Trends in Theory of Correlated Materials TTCM2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Chirality polarizations and spectral bulk-boundary correspondence2018

    • Author(s)
      大同暁人
    • Organizer
      第4回「トポロジーが紡ぐ物質科学のフロンティア」領域研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 絶縁体における局所磁気四極子モーメント2018

    • Author(s)
      大同暁人,下出敦夫,柳瀬陽一
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Z4 Topological Superconductivity in UCoGe2018

    • Author(s)
      Akito Daido, Tsuneya Yoshida and Youichi Yanase
    • Organizer
      TMS-EPiQS 2nd Alliance Workshop: Topological Magnets and Topological Superconductors
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Topological d-wave Superconductivity in Cuprate Thin Films2018

    • Author(s)
      Akito Daido, Youichi Yanase
    • Organizer
      APS March Meeting 2018
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 非共型結晶UCoGeにおけるZ4トポロジカル超伝導2018

    • Author(s)
      大同暁人,吉田恒也,柳瀬陽一
    • Organizer
      日本物理学会第73回年次大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Unidirectional Majorana edge states in noncentrosymmetric nodal superconductors2017

    • Author(s)
      Akito Daido, Youichi Yanase
    • Organizer
      International Conference on Topological Materials Science 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Topological d-wave superconductivity and unidirectional Majorana edge states under tilted Zeeman field2017

    • Author(s)
      Akito Daido, Youichi Yanase
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 低磁場における空間反転対称性の破れた異方的トポロジカル超伝導2017

    • Author(s)
      大同暁人,柳瀬陽一
    • Organizer
      超伝導研究の最先端:多自由度、非平衡、電子相関、トポロジー、人工制御
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] 非共形結晶UCoGeにおけるトポロジカル超伝導2017

    • Author(s)
      大同暁人,柳瀬陽一
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Topological glide superconductivity in UCoGe2017

    • Author(s)
      Akito Daido, Tsuneya Yoshida and Youichi Yanase
    • Organizer
      ETH-Amsterdam-Kyoto mini-workshop on multipole physics and ultrafast dynamics
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Topological glide superconductivity in UCoGe under pressure2017

    • Author(s)
      Akito Daido, Youichi Yanase
    • Organizer
      Physics of Uranium based Unconventional Superconductors
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Topological Glide Superconductivity in UCoGe2017

    • Author(s)
      Akito Daido, Tsuneya Yoshida and Youichi Yanase
    • Organizer
      Novel Quantum States in Condensed Matter 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-05-25   Modified: 2024-03-26  

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