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Study of edge current in Wyle magnets

Research Project

Project/Area Number 18K18727
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

Shibauchi Takasada  東京大学, 大学院新領域創成科学研究科, 教授 (00251356)

Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywordsベリー位相 / 軌道磁化 / ワイル磁性体 / カイラル磁性 / エッジ電流 / 走査型顕微鏡 / ホール素子 / 走査型磁気顕微鏡 / トポロジカル物質 / 表面磁場分布 / 時間反転対称性 / カイラル反強磁性 / トンネル磁気抵抗素子
Outline of Final Research Achievements

In this research, we aim to observe the orbital magnetization due to edge currents induced by the Berry phase, for the first time, in recently discovered Wyle magnet candidate Mn3Sn. By using scanning Hall microscopy, we investigate the detailed distributions of the surface of Mn3Sn, and find that there is an additional component that cannot be explained by the usual magnetization. From the temperature and magnetic field dependence of this additional component, which we compare with the self-consistent simulation including the demagnetization effect, we conclude that the orbital magnetization caused by the Berry phase exists.

Academic Significance and Societal Importance of the Research Achievements

波動関数が獲得する幾何学的位相であるベリー位相に起因して、様々な新しい物性が現れることが近年盛んに研究されている。そのような中、ベリー位相を起因とするエッジ電流による軌道磁化の存在は、理論的には古くから予言されている反面、未だ実験的に観測されていない。この新しい軌道磁化を観測するためには、時間反転対称性の破れた系が必要であるが、通常の強磁性体においては、通常の磁化成分が圧倒的に大きいためその観測は困難であった。本研究では、通常磁化の成分が小さい系に着目して、世界で初めて軌道磁化の観測に成功した。本研究結果は、磁性におけるベリー位相の寄与の理解を格段に進歩させるものである。

Report

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

    (9 results)

All 2019 Other

All Int'l Joint Research (3 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] 香港中文大学(中国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] エコールポリテクニーク(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] エコールポリテクニーク(フランス)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Measuring magnetic field texture in correlated electron systems under extreme conditions2019

    • Author(s)
      Yip King Yau、Ho Kin On、Yu King Yiu、Chen Yang、Zhang Wei、Kasahara S.、Mizukami Y.、Shibauchi T.、Matsuda Y.、Goh Swee K.、Yang Sen
    • Journal Title

      Science

      Volume: 366 Issue: 6471 Pages: 1355-1359

    • DOI

      10.1126/science.aaw4278

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Field-angular variations of heat capacity and thermal Hall conductance in the Kitaev material a-RuCl32019

    • Author(s)
      T. Shibauchi
    • Organizer
      The 2nd Workshop on Spin-Orbit Coupled Topological States (SOCTS 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Itinerant orbital magnetization in topological antiferromagnetic state2019

    • Author(s)
      M. Shimozawa, K. Sugii, J. Kondo, Y. Suzuki, M. Yamashita, T. Nakamura, S. Katsumoto, Y. Tada, M. Ikhras, T. Higo, T. Tomita, S. Nakatsuji, M. Konczykowski, Y. Matsuda, K. Mukasa, K. Matsuura, Y. Mizukami, T. Shibauchi, M.-T. Suzuki, and R. Arita,
    • Organizer
      Topological Materials Science, The Fourth Annual meeting
    • Related Report
      2019 Annual Research Report
  • [Presentation] α-RuCl3における磁場中比熱:マヨラナギャップの角度依存性2019

    • Author(s)
      芝内孝禎
    • Organizer
      第12回トポロジー連携研究会「マヨラナ励起の実証に向けて」
    • Related Report
      2019 Annual Research Report
  • [Remarks] 芝内・橋本研究室

    • URL

      http://qpm.k.u-tokyo.ac.jp/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 芝内研究室

    • URL

      http://qpm.k.u-tokyo.ac.jp/index.html

    • Related Report
      2018 Research-status Report

URL: 

Published: 2018-07-25   Modified: 2021-02-19  

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