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Quantum phase transition in topological insulators induced by coherent surface phonons

Research Project

Project/Area Number 17H02908
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics I
Research InstitutionUniversity of Tsukuba

Principal Investigator

Hase Muneaki  筑波大学, 数理物質系, 教授 (40354211)

Co-Investigator(Kenkyū-buntansha) 齊藤 雄太  国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 主任研究員 (50738052)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
Fiscal Year 2019: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2018: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsトポロジカル絶縁体 / フォノン / フェムト秒レーザー / ワイル半金属 / スパッタリング / コヒーレントフォノン分光 / フェムト秒 / 光物性 / トポロジー
Outline of Final Research Achievements

This project aims to study coherent surface phonons in topological insulator (TI), and discuss about electron-phonon interaction at the surface. As the results of time-resolved pump-probe experiments on the surface of Sb2Te3, we uncovered the observation of dynamical Fano resonance with significant pump fluence dependence. Furthermore, we produced the alloyed film sample of Bi1-xSbx by spattering, and measured the coherent phonons. As the results, we observed a peculiar electron-phonon scattering at x=0.5, which cannot be explained by a simple alloy scattering model.

Academic Significance and Societal Importance of the Research Achievements

トポロジカル絶縁体(Topological Insulator: TI)は、直線的エネルギー分散であるディラック・コーンで特徴付けられる金属的表面状態をもち、一方ではバンドギャップが開いた絶縁体のバルク構造をもつ興味深い物質である。本研究では、TI表面におけるコヒーレントフォノンを高感度に観測し、表面における電子―フォノン相互作用に関する知見を得ることに成功した。これにより、例えば表面の高移動度電子を活用した低消費電力の新規デバイスの開発に繋がる可能性があると考えている。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (14 results)

All 2020 2019 2018 2017 Other

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results) Remarks (1 results)

  • [Journal Article] High-quality sputter-grown layered chalcogenide films for phase change memory applications and beyond2020

    • Author(s)
      Y. Saito, P. Fons, A. V Kolobov, K. Mitrofanov, K. Makino, J. Tominaga, S. Hatayama, Y. Sutou, M. Hase, J. D. Robertson
    • Journal Title

      Journal of Physics D: Applied Physics

      Volume: 53 Issue: 28 Pages: 284002-284002

    • DOI

      10.1088/1361-6463/ab850b

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ultrafast dynamics of the low frequency shear phonon in 1T′-MoTe22020

    • Author(s)
      T. Fukuda, K. Makino, Y. Saito, P. Fons, A. V. Kolobov, K. Ueno, and M. Hase
    • Journal Title

      Applied Physics Letters

      Volume: 116 Issue: 9 Pages: 093103-093103

    • DOI

      10.1063/1.5143485

    • NAID

      120007127630

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Transient Fano Resonance in Topological Insulators Observed by Coherent Phonon Spectroscopy2019

    • Author(s)
      R. Mondal, A. Arai, Y. Saito, P. Fons, A. V. Kolobov, J. Tominaga, and M. Hase
    • Journal Title

      EPJ Web of Conferences

      Volume: 205 Pages: 04021-04021

    • DOI

      10.1051/epjconf/201920504021

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A topological phase buried in a chalcogenide superlattice monitored by a helicity dependent Kerr measurement2018

    • Author(s)
      R. Mondal, Y. Saito, Y. Aihara, P. Fons, A. V. Kolobov, J. Tominaga, and M. Hase
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 10 Issue: 31 Pages: 26781-26786

    • DOI

      10.1021/acsami.8b07974

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Coherent Dirac plasmons in topological insulators2018

    • Author(s)
      Mondal Richarj、Arai Akira、Saito Yuta、Fons Paul、Kolobov Alexander V.、Tominaga Junji、Hase Muneaki
    • Journal Title

      Physical Review B

      Volume: 97 Issue: 14 Pages: 144306-144306

    • DOI

      10.1103/physrevb.97.144306

    • NAID

      120007134153

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] Bi1-xSbxのワイル半金属領域における超高速フォノンダイナミクス2020

    • Author(s)
      小森 雄太, 齊藤 雄太, 長谷 宗明
    • Organizer
      応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Recent update on the growth of crystalline phase change materials by sputtering2019

    • Author(s)
      Y. Saito, P. Fons, A. V Kolobov, K. Mitrofanov, K. Makino, J. Tominaga, S. Hatayama, Y. Sutou, M. Hase, J. D. Robertson
    • Organizer
      相変化研究会シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] Revisiting the growth mechanism of layered crystalline phase change materials by sputtering2019

    • Author(s)
      Y. Saito, A. V Kolobov, P. Fons, K. Mitrofanov, K. Makino, J. Tominaga, M. Hase, J. D. Robertson
    • Organizer
      European Phase Change and Ovonic Symposium 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Transient Fano Resonance in Topological Insulators Observed by Coherent Phonon Spectroscopy2018

    • Author(s)
      R. Mondal, A. Arai, Y. Saito, P. Fons, A. V. Kolobov, J. Tominaga, and M. Hase
    • Organizer
      XXI International Conference on Ultrafast Phenomena
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Femtosecond magneto-optical response in chalcogenide superlattices2018

    • Author(s)
      R. Mondal, T. Suzuki, Y. Saito, P. Fons, A. V. Kolobov, J. Tominaga, and M. Hase
    • Organizer
      European symposium on Phase-Change and Ovonic Sciences 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of the topological phase in a chalcogenide supperlattice using magneto-optical Kerr effect2018

    • Author(s)
      R. Mondal, Y. Aihara, Y. Saito, P. Fons, A. V. Kolobov, J. Tominaga, and M. Hase
    • Organizer
      The 30th Symposium on Phase Change Oriented Science
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Fano resonance in topological insulators revealed by coherent phonon spectroscopy2017

    • Author(s)
      Richarj Mondal, Akira Arai, Yuta Saito Paul Fons, Alexander V. Kolobov, Junji Tominaga, Muneaki Hase
    • Organizer
      第29回 相変化研究会シンポジウム(PCOS2017)
    • Related Report
      2017 Annual Research Report
  • [Presentation] Femtosecond spectroscopic studies on chalcogenide superlattices: structure and topological properties2017

    • Author(s)
      Muneaki Hase
    • Organizer
      European Phase Change and Ovonic Symposium 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 長谷研究室

    • URL

      http://bukko.bk.tsukuba.ac.jp/~mhase/indexJ.html

    • Related Report
      2018 Annual Research Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

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