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Detection of spontaneous magnetization in chiral superconductors using a circularly polarized microwave cavity

Research Project

Project/Area Number 22K18683
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Hashimoto Kenichiro  東京大学, 大学院新領域創成科学研究科, 准教授 (00634982)

Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2022: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywordsカイラル超伝導 / 円偏波 / 共振器 / マイクロ波 / 円二色性 / 自発磁化 / 空洞共振器 / 誘電体ルチル / ホール伝導度 / 円偏光空洞共振器 / トポロジカル超伝導 / マヨラナ粒子 / 円偏光
Outline of Research at the Start

近年、時間反転対称性が破れたカイラル超伝導体がマヨラナ粒子をもつトポロジカル超伝導体になり得ることが分かり、基礎・応用の両面から盛んに研究されている。本研究では、マイクロ波円偏光空洞共振器を開発し、カイラル超伝導体候補物質において期待される微小な自発磁化を高感度に検出し、カイラル超伝導実現の是非を徹底的に検証する。本研究により、マイクロ波円偏光空洞共振器を構築することができれば、従来のμSR測定やKerr効果測定において問題となる試料サイズや測定感度の問題点を克服した、全く新しいカイラル超伝導体の検証方法を確立できると考える。

Outline of Final Research Achievements

In this study, we developed a high-Q circularly polarized cavity using rutile, a dielectric material, to establish a new verification method for chiral superconductors. With this resonator, one can detect the tiny spontaneous magnetization expected in a chiral superconductor with high sensitivity. As a test measurement, we conducted Hall conductivity measurements on small single crystals of Bi under a magnetic field, demonstrating the ability of the circularly polarized resonator to detect the off-diagonal components of the conductivity tensor. We plan to construct a circularly polarized cavity operating at dilution refrigerator temperatures to thoroughly verify the feasibility of chiral superconductivity.

Academic Significance and Societal Importance of the Research Achievements

カイラル超伝導体はトポロジカル超伝導体の代表的な候補物質であり、試料表面にマヨラナ粒子が現れることが理論的に指摘されており、その理解はトポロジカル量子計算への応用の観点からも極めて重要である。しかしながら、カイラル超伝導体の検証は実験的に極めて困難であり、候補物質はいくつも報告されているものの、実験的確証には至っていない。したがって、本研究により、カイラル超伝導体の理解が進めば、基礎物理学だけでなく、応用上の観点からも大きな進展が期待される。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (26 results)

All 2024 2023 2022 Other

All Int'l Joint Research (6 results) Journal Article (12 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 12 results,  Open Access: 10 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 8 results)

  • [Int'l Joint Research] Ecole Polytechnique(フランス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Columbia University(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Frankfurt University(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] フランクフルト大学(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] エコール・ポリテクニーク(フランス)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] UCサンタバーバラ大学(米国)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Evidence for an odd-parity nematic phase above the charge-density-wave transition in a kagome metal2024

    • Author(s)
      Asaba T.、Onishi A.、Kageyama Y.、Kiyosue T.、Ohtsuka K.、Suetsugu S.、Kohsaka Y.、Gaggl T.、Kasahara Y.、Murayama H.、Hashimoto K.、Tazai R.、Kontani H.、Ortiz B. R.、Wilson S. D.、Li Q.、Wen H. -H.、Shibauchi T.、Matsuda Y.
    • Journal Title

      Nature Physics

      Volume: 20 Issue: 1 Pages: 40-46

    • DOI

      10.1038/s41567-023-02272-4

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Majorana-fermion origin of the planar thermal Hall effect in the Kitaev magnet α-RuCl <sub>3</sub>2024

    • Author(s)
      Imamura Kumpei、Suetsugu Shota、Mizukami Yuta、Yoshida Yusei、Hashimoto Kenichiro、Ohtsuka Kenichi、Kasahara Yuichi、Kurita Nobuyuki、Tanaka Hidekazu、Noh Pureum、Nasu Joji、Moon Eun-Gook、Matsuda Yuji、Shibauchi Takasada
    • Journal Title

      Science Advances

      Volume: 10 Issue: 11

    • DOI

      10.1126/sciadv.adk3539

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Defect-Induced Low-Energy Majorana Excitations in the Kitaev Magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>?</mml:mtext><mml:msub><mml:mrow><mml:mi>RuCl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>2024

    • Author(s)
      Imamura K.、Mizukami Y.、Tanaka O.、Grasset R.、Konczykowski M.、Kurita N.、Tanaka H.、Matsuda Y.、Yamada M.?G.、Hashimoto K.、Shibauchi T.
    • Journal Title

      Physical Review X

      Volume: 14 Issue: 1 Pages: 011045-011045

    • DOI

      10.1103/physrevx.14.011045

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Combined experimental and theoretical studies on glasslike transitions in the frustrated molecular conductors θ-(BEDT-TTF)2MM'(SCN)42024

    • Author(s)
      Saito Yohei、Ganter Owen、Shang Chao、Hashimoto Kenichiro、Sasaki Takahiko、Winter Stephen M.、Muller Jens、Lang Michael
    • Journal Title

      Physical Review Research

      Volume: 6 Issue: 2

    • DOI

      10.1103/physrevresearch.6.023003

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Anisotropic enhancement of lower critical field in ultraclean crystals of spin-triplet superconductor candidate UTe22023

    • Author(s)
      K. Ishihara, M. Kobayashi, K. Imamura, M. Konczykowski, H. Sakai, P. Opletal, Y. Tokiwa, Y. Haga, K. Hashimoto, and T. Shibauchi
    • Journal Title

      Phys. Rev. Res.

      Volume: 5 Issue: 2 Pages: 022002-022002

    • DOI

      10.1103/physrevresearch.5.l022002

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Two superconducting states with broken time-reversal symmetry in FeSe1-xSx2023

    • Author(s)
      K. Matsuura, M. Roppongi, .... et al (他26名)
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 120 Issue: 21 Pages: 1-6

    • DOI

      10.1073/pnas.2208276120

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations2023

    • Author(s)
      Ishihara Kota、Roppongi Masaki、Kobayashi Masayuki、Imamura Kumpei、Mizukami Yuta、Sakai Hironori、Opletal Petr、Tokiwa Yoshifumi、Haga Yoshinori、Hashimoto Kenichiro、Shibauchi Takasada
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 1-7

    • DOI

      10.1038/s41467-023-38688-y

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bulk evidence of anisotropic s-wave pairing with no sign change in the kagome superconductor CsV3Sb52023

    • Author(s)
      Roppongi M.、Ishihara K.、Tanaka Y.、Ogawa K.、Okada K.、Liu S.、Mukasa K.、Mizukami Y.、Uwatoko Y.、Grasset R.、Konczykowski M.、Ortiz B. R.、Wilson S. D.、Hashimoto K.、Shibauchi T.
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 667-667

    • DOI

      10.1038/s41467-023-36273-x

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Double dome structure of the Bose-Einstein condensation in diluted S=3/2 quantum magnets2023

    • Author(s)
      Watanabe Yoshito、Miyake Atsushi、Gen Masaki、Mizukami Yuta、Hashimoto Kenichiro、Shibauchi Takasada、Ikeda Akihiko、Tokunaga Masashi、Kurumaji Takashi、Tokunaga Yusuke、Arima Taka-hisa
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 1260-1260

    • DOI

      10.1038/s41467-023-36725-4

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Pure nematic quantum critical point accompanied by a superconducting dome2022

    • Author(s)
      Ishida Kousuke、Onishi Yugo、Tsujii Masaya、Mukasa Kiyotaka、Qiu Mingwei、Saito Mikihiko、Sugimura Yuichi、Matsuura Kohei、Mizukami Yuta、Hashimoto Kenichiro、Shibauchi Takasada
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 119 Issue: 18

    • DOI

      10.1073/pnas.2110501119

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comparison of the charge-crystal and charge-glass state in geometrically frustrated organic conductors studied by fluctuation spectroscopy2022

    • Author(s)
      Thomas Tatjana、Thyzel Tim、Sun Hungwei、Muller Jens、Hashimoto Kenichiro、Sasaki Takahiko、Yamamoto Hiroshi M.
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 20 Pages: 205111-205111

    • DOI

      10.1103/physrevb.105.205111

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Optical Conductivity Spectra of Charge-Crystal and Charge-Glass States in a Series of θ-Type BEDT-TTF Compounds2022

    • Author(s)
      Hashimoto Kenichiro、Kobayashi Ryota、Ohkura Satoshi、Sasaki Satoru、Yoneyama Naoki、Suda Masayuki、Yamamoto Hiroshi M.、Sasaki Takahiko
    • Journal Title

      Crystals

      Volume: 12 Issue: 6 Pages: 831-831

    • DOI

      10.3390/cryst12060831

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 新規カゴメ格子超伝導体AV3Sb5の輸送現象と超伝導ギャップ構造2024

    • Author(s)
      橋本顕一郎
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe2024

    • Author(s)
      Kenichiro Hashimoto
    • Organizer
      American Physical Society March meetin
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 新規カゴメ格子超伝導体AV3Sb5の超伝導と電荷密度波2023

    • Author(s)
      橋本顕一郎
    • Organizer
      京都大学基礎物理学研究所研究会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 新規カゴメ格子超伝導体CsV3Sb5の超伝導ギャップ構造2023

    • Author(s)
      橋本顕一郎
    • Organizer
      東京大学物性研究所共同利用成果発表会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] カゴメ格子超伝導体AV3Sb5の超伝導ギャップ構造2023

    • Author(s)
      橋本顕一郎
    • Organizer
      強相関電子系のフロンティア研究会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Superconductivity in copper-based MOFs2023

    • Author(s)
      橋本顕一郎
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Randomness effect on charge glass formation in θ-type BEDT-TTF compounds2022

    • Author(s)
      K. Hashimoto
    • Organizer
      SPICE Workshop “New Spin on Molecular Quantum Materials”
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 新規カゴメ格子超伝導体CsV3Sb5における符号反転のないs波超伝導2022

    • Author(s)
      橋本顕一郎
    • Organizer
      京都大学基礎物理学研究所研究会
    • Related Report
      2022 Research-status Report
    • Invited

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Published: 2022-07-05   Modified: 2025-01-30  

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