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Study of the topological surface state in the topological Kondo insulator of rare earth hexaborides

Research Project

Project/Area Number 15K05132
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics I
Research InstitutionHiroshima University

Principal Investigator

Arita Masashi  広島大学, 技術センター, 技術専門職員 (20379910)

Co-Investigator(Kenkyū-buntansha) 伊賀 文俊  茨城大学, 理学部, 教授 (60192473)
Co-Investigator(Renkei-kenkyūsha) Shimada Kenya  広島大学, 放射光科学研究センター, 教授 (10284225)
Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsトポロジカル絶縁体 / 近藤絶縁体 / 角度分解光電子分光 / トポロジカル近藤絶縁体
Outline of Final Research Achievements

We have investigated the topological Kondo insulator: SmB6, the candidate material: YbB6, compounds:Sm1-xYbxB6 and Yb1-xTmxB6 by means of angle resolved photoemission spectroscopy. In Yb1-xTmxB6, Dirac-corn-like band structure is observed at X(bar) and Gamma(bar) near EF. According to the band calculation, the structures are derived from bulk bands which have small overlap between valence and conduction bands. Thus, it is assumed that YbB6 is not the topological Kondo insulator.
Since there are no changes of the band structures between SmB6 and Sm0.9Yb0.1B6, the electronic structure of SmB6 are robust for the Yb substitution less than 10 % of the Sm site. In SmB6, we found the metallic band structure which forms the circular Fermi surface centered at Gamma(bar) point at 10 K. Metal insulator transition is clearly observed in the band between 30K and 60 K. It is concluded that the band stems from the topological surface state.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (8 results)

All 2018 2017 2016 2015

All Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Alkali-metal induced band structure deformation investigated by angle-resolved photoemission spectroscopy and first-principles calculations2018

    • Author(s)
      S. Ito, B. Feng, M. Arita, T. Someya, W.-C. Chen, A. Takayama, T. Iimori, H. Namatame, M. Taniguchi, C.-M. Cheng, S.-J. Tang, F. Komori, I. Matsuda
    • Journal Title

      Physical Review B

      Volume: 97 Issue: 15 Pages: 1-8

    • DOI

      10.1103/physrevb.97.155423

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental observation of node-line-like surface states in LaBi2018

    • Author(s)
      Baojie Feng, Jin Cao, Meng Yang, Ya Feng, Shilong Wu, Botao Fu, Masashi Arita, Koji Miyamoto, Shaolong He, Kenya Shimada, Youguo Shi, Taichi Okuda, and Yugui Yao
    • Journal Title

      PHYSICAL REVIEW B

      Volume: 97 Issue: 15 Pages: 155153-155153

    • DOI

      10.1103/physrevb.97.155153

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe22017

    • Author(s)
      Mingzhe Yan, Huaqing Huang, Kenan Zhang, Eryin Wang, Wei Yao, Ke Deng, Guoliang Wan, Hongyun Zhang, Masashi Arita, Haitao Yang, Zhe Sun, Hong Yao, Yang Wu, Shoushan Fan, Wenhui Duan and Shuyun Zhou
    • Journal Title

      Nature Communicationsvolume

      Volume: 8 Issue: 1

    • DOI

      10.1038/s41467-017-00280-6

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Sm1-xYbxB6の角度分解光電子分光2018

    • Author(s)
      有田将司、佐藤仁、島田賢也、生天目博文、谷口雅樹 谷田博司、平野航、小山内湧人、林健人、伊賀文俊
    • Organizer
      日本放射光学会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Angle resolved photoemission study of Sm1-xYbxB62017

    • Author(s)
      M. Arita, H. Sato, K. Shimada, H. Namatame, M. Taniguchi H. Tanida, W. Hirano, Y. Osanai, K. Hayashi, F. Iga
    • Organizer
      International workshop on strong correlations and angle-resolved photoemission spectroscopy
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 価数揺動系SmB6の試料厚み依存性とSm1-xRxB6(R=Yb2+,La3+,Zr4+)におけるエネルギーギャップの組成依存性2016

    • Author(s)
      小山内湧人, 菊地翔弥, 平野航, 水戸毅, 佐藤桂輔, 近藤晃弘, 金道浩一, 伊賀文俊
    • Organizer
      日本物理学会 年次大会
    • Place of Presentation
      宮城県仙台市 東北学院大学
    • Year and Date
      2016-03-19
    • Related Report
      2015 Research-status Report
  • [Presentation] Yb1-xTmxB6の角度分解光電子分光2016

    • Author(s)
      有田将司, 佐藤仁, 生天目博文, 谷口雅樹, 伊賀文俊
    • Organizer
      日本放射光学会
    • Place of Presentation
      千葉県柏市 東京大学
    • Year and Date
      2016-01-09
    • Related Report
      2015 Research-status Report
  • [Presentation] 価数揺動系Sm1-xRxB6(R=Yb2+,La3+,Zr4+)のエネルギーギャップの組成依存性と厚み依存性2015

    • Author(s)
      小山内湧人, 菊地翔弥, 伊賀文俊, 水戸毅, 佐藤桂輔, 近藤晃弘, 金道浩一
    • Organizer
      日本物理学会 秋季大会
    • Place of Presentation
      大阪府吹田市 関西大学
    • Year and Date
      2015-09-16
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2020-05-15  

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