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Spin transport phenomena induced by quantum geometric structure in topological superconductors

Research Project

Project/Area Number 20K03860
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionOsaka University

Principal Investigator

Mizushima Takeshi  大阪大学, 大学院基礎工学研究科, 准教授 (50379707)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsトポロジカル超伝導 / スピントロニクス / 異方的超伝導 / マヨラナ準粒子 / スピン輸送 / 交差応答 / 集団励起 / スピンネルンスト効果 / スピンゼーベック効果 / 準古典理論 / 熱ホール効果
Outline of Research at the Start

Berry位相に代表される量子状態空間の幾何学的構造は現代の物理学において最も重要な概念の一つである。本研究課題では、トポロジカル超伝導とスピントロニクスの知見を融合することで、量子幾何構造が織りな す豊かなスピン物性を抽出することを目指す。一方、超伝導輸送研究で広く用いられる強力な 理論として準古典Eilenberger理論があるが、この理論は量子幾何構造を取り込んでいないという重大な欠陥がある。そこで本研究課題では、量子幾何構造を取り込んだ準古典輸送理論の確立を目指す。この理論を基に、クーパー対のダイナミクスに由来した量子幾何構造の揺らぎが生み出す新奇な超伝導スピン物性を探求する。

Outline of Final Research Achievements

Through this research project, we revealed thermal spin transport phenomena in topological superconductors. In particular, we demonstrated that in time-reversal-invariant topological superconductors, Bogoliubov quasiparticles experience spin-dependent asymmetric scattering at nonmagnetic impurities, reflecting the symmetry of helical Cooper pairs. Therefore, when a temperature gradient is applied, a spin current mediated by quasiparticles flows in the direction perpendicular to the temperature gradient, i.e., the spin Nernst effect. Furthermore, we revealed that in nonunitary superconducting states with broken time-reversal symmetry, the spin Seebeck effect' occurs in which spin current flows in the direction along the temperature gradient. Our findings suggest that the symmetry of Cooper pairs in topological superconductors can be directly detected by observing these thermal spin transport phenomena.

Academic Significance and Societal Importance of the Research Achievements

本研究課題では得られた成果の最も重要な意義は、トポロジカル超伝導を担うクーパー対の非自明な対称性を熱スピン輸送現象を通して検出することができるということを明らかにしたことである。これまで、時間反転対称性を破った超伝導では、カイラルクーパー対が鏡映対称性を破ることで、異常熱ホール効果が現れることがわかっていた。一方で、時間反転対称性を保ったトポロジカル超伝導や非ユニタリ超伝導固有の輸送現象は知られていなかった。我々の成果によって、前者ではスピンネルンスト効果が現れ、後者の超伝導状態ではスピンゼーベック効果が現れることを明らかになった。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (35 results)

All 2024 2023 2022 2021 2020

All Journal Article (18 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 18 results,  Open Access: 3 results) Presentation (17 results) (of which Int'l Joint Research: 4 results,  Invited: 5 results)

  • [Journal Article] Non-Abelian anyons and non-Abelian vortices in topological superconductors2024

    • Author(s)
      Masaki Yusuke、Mizushima Takeshi、Nitta Muneto
    • Journal Title

      Encyclopedia of Condensed Matter Physics (Second Edition)

      Volume: 2 Pages: 755-794

    • DOI

      10.1016/b978-0-323-90800-9.00225-0

    • ISBN
      9780323914086
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pairing symmetries of multiple superconducting phases in UTe2: Competition between ferromagnetic and antiferromagnetic fluctuations2024

    • Author(s)
      Jushin Tei, Takeshi Mizushima, Satoshi Fujimoto
    • Journal Title

      Physical Review B

      Volume: 109 Issue: 6 Pages: 064516-064516

    • DOI

      10.1103/physrevb.109.064516

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Enhanced 2pi-periodic Aharonov-Bohm Effect as a Signature of Majorana Zero Modes Probed by Nonlocal Measurements2023

    • Author(s)
      Masayuki Sugeta, Takeshi Mizushima, Satoshi Fujimoto
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 92 Issue: 5 Pages: 054701-054701

    • DOI

      10.7566/jpsj.92.054701

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Possible realization of topological crystalline superconductivity with time-reversal symmetry in UTe22023

    • Author(s)
      Jushin Tei, Takeshi Mizushima, Satoshi Fujimoto
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 14 Pages: 144517-144517

    • DOI

      10.1103/physrevb.107.144517

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Imprinting spiral Higgs waves onto superconductors with vortex beams2023

    • Author(s)
      Takeshi Mizushima, Masahiro Sato
    • Journal Title

      Physical Review Research

      Volume: 5 Issue: 4

    • DOI

      10.1103/physrevresearch.5.l042004

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nonlocal Spin Correlation as a Signature of Ising Anyons Trapped in Vacancies of the Kitaev Spin Liquid2023

    • Author(s)
      Takahashi Masahiro O.、Yamada Masahiko G.、Udagawa Masafumi、Mizushima Takeshi、Fujimoto Satoshi
    • Journal Title

      Physical Review Letters

      Volume: 131 Issue: 23 Pages: 236701-236701

    • DOI

      10.1103/physrevlett.131.236701

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators2023

    • Author(s)
      Mizushima Takeshi、Tamura Shun、Yada Keiji、Tanaka Yukio
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 6 Pages: 064504-064504

    • DOI

      10.1103/physrevb.107.064504

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Anomalous acoustoelectric effect induced by clapping modes in chiral superconductors2022

    • Author(s)
      T. Matsushita, T. Mizushima, I. Vekhter, S. Fujimoto
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 13 Pages: 134520-134520

    • DOI

      10.1103/physrevb.105.134520

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Non-Abelian half-quantum vortices in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow /><mml:mn>3</mml:mn></mml:msup><mml:msub><mml:mi>P</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> topological superfluids2022

    • Author(s)
      Y. Masaki, T. Mizushima, M. Nitta
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 22 Pages: 220503-220503

    • DOI

      10.1103/physrevb.105.l220503

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Manipulation of Majorana-Kramers qubit and its tolerance in time-reversal invariant topological superconductor2022

    • Author(s)
      Y. Tanaka, T. Sanno, T. Mizushima, S. Fujimoto
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 1 Pages: 014522-014522

    • DOI

      10.1103/physrevb.106.014522

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Intrinsic Anomalous Thermal Hall Effect in the Unconventional Superconductor UTe<sub>2</sub>2022

    • Author(s)
      Y. Moriya, T. Matsushita, M. G. Yamada, T. Mizushima, S. Fujimoto
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 9 Pages: 094710-094710

    • DOI

      10.7566/jpsj.91.094710

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Engineering Yang-Lee anyons via Majorana bound states2022

    • Author(s)
      T. Sanno, M. G. Yamada, T. Mizushima, S. Fujimoto
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 17 Pages: 174517-174517

    • DOI

      10.1103/physrevb.106.174517

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spin-Nernst Effect in Time-Reversal-Invariant Topological Superconductors2022

    • Author(s)
      Matsushita Taiki、Ando Jiei、Masaki Yusuke、Mizushima Takeshi、Fujimoto Satoshi、Vekhter Ilya
    • Journal Title

      Physical Review Letters

      Volume: 128 Issue: 9 Pages: 097001-097001

    • DOI

      10.1103/physrevlett.128.097001

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Radial Fulde-Ferrell-Larkin-Ovchinnikov state in a population-imbalanced Fermi gas2021

    • Author(s)
      Daisuke Inotani, Shigehiro Yasui, Takeshi Mizushima, Muneto Nitta
    • Journal Title

      Physical Review A

      Volume: 103 Issue: 5

    • DOI

      10.1103/physreva.103.053308

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spin-polarized phases of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>P</mml:mi><mml:mn>2</mml:mn><mml:none /><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts></mml:math> superfluids in neutron stars2021

    • Author(s)
      Mizushima Takeshi、Yasui Shigehiro、Inotani Daisuke、Nitta Muneto
    • Journal Title

      Physical Review C

      Volume: 104 Issue: 4

    • DOI

      10.1103/physrevc.104.045803

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Topological nematic phase transition in Kitaev magnets under applied magnetic fields2021

    • Author(s)
      Takahashi Masahiro O.、Yamada Masahiko G.、Takikawa Daichi、Mizushima Takeshi、Fujimoto Satoshi
    • Journal Title

      Physical Review Research

      Volume: 3 Issue: 2

    • DOI

      10.1103/physrevresearch.3.023189

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ab initio simulation of non-Abelian braiding statistics in topological superconductors2021

    • Author(s)
      T. Sanno, S. Miyazaki, T. Mizushima, S. Fujimoto
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 5 Pages: 054504-054504

    • DOI

      10.1103/physrevb.103.054504

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] ネマティック超伝導2020

    • Author(s)
      水島健
    • Journal Title

      固体物理

      Volume: 55 Pages: 479-479

    • NAID

      40022384101

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Thermal Generation of Spin Current in Superfluid 3He and Unconventional SC2023

    • Author(s)
      Takeshi Mizushima
    • Organizer
      International Symposium on Quantum Fluids and Solids (QFS2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 光渦で探る超伝導ヒッグスモード2023

    • Author(s)
      水島健
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 光渦で探る超伝導体のHiggsモード2023

    • Author(s)
      水島健
    • Organizer
      第3回光渦研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] Pair Density Waves in Confined Superfluid 3He2022

    • Author(s)
      Takeshi Mizushima
    • Organizer
      29th International Conference on Low Temperature Physics (LT29)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] トポロジカル超伝導における交差相関応答2022

    • Author(s)
      水島健
    • Organizer
      短期研究会「不均一系の超伝導・超流動」
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 非ユニタリ超伝導体を舞台としたスピンカロリトロニクスの理論2022

    • Author(s)
      水島健
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] s波超伝導体における光渦を用いたHiggsモード励起と線形光学応答の理論2022

    • Author(s)
      水島健
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] トポロジカル絶縁体のネマティック・カイラル超伝導相における奇周波数クーパー対と異常近接効果2022

    • Author(s)
      水島健
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] テラヘルツ光渦で探る超伝導体のHiggsモード2022

    • Author(s)
      水島健
    • Organizer
      新学術領域研究「量子液晶の物性科学」領域研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] Spatially-modulated superfluid phases in confined 3He: nucleation and crystallization of polka-dots2021

    • Author(s)
      Takeshi Mizushima
    • Organizer
      UK Quantum Fluids network webinars
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 光渦レーザーを照射した超伝導薄膜におけるクーパー対ダイナミクス2021

    • Author(s)
      水島健,佐藤正寛
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 制限空間中の超流動^3^HeにおけるCooper対揺らぎと対液晶状態2021

    • Author(s)
      水島健,石浦大暉,川上拓人
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Pair-Density-Wave Fluctuation and Crystallization in Confined Superfluid 3He2021

    • Author(s)
      Takeshi Mizushima
    • Organizer
      International Symposium on Quantum Fluids and Solids (QFS2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] トポロジカル超伝導体における内因性逆スピンホール効果2021

    • Author(s)
      荻原惇,松下太樹,水島健
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Introduction(企画提案・趣旨説明): シンポジウム「Current Status of physics in odd frequency Cooper pairings」にて2021

    • Author(s)
      水島健
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 中性子星内部のスピン偏極した3P2超流動状態2020

    • Author(s)
      水島健,安井繁宏,猪谷太輔,新田宗土
    • Organizer
      日本物理学会2020年秋季大会(素核宇)
    • Related Report
      2020 Research-status Report
  • [Presentation] Pair Density Waves in Superfluid 3He under Nanoscale Confinement2020

    • Author(s)
      水島健
    • Organizer
      新学術領域研究「量子液晶の物性科学」領域研究会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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