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Optical measurement for Berry curvature on topological materials

Publicly Offered Research

Project AreaDiscrete Geometric Analysis for Materials Design
Project/Area Number 18H04473
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Research InstitutionTohoku University

Principal Investigator

Chen Yong  東北大学, 材料科学高等研究所, 教授 (30806732)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywordsトポロジカル物質 / トポロジー / 離散幾何学
Outline of Annual Research Achievements

離散幾何学解析を含めて数理解析は、次世代の情報処理解析や計測技術として、数理科学、材料科学や物理学の研究分野で大きな貢献が期待されている。一般的に、数理解析を量子科学または材料の“幾何とトポロジー”に応用し、その物性の予測及び実験的に計測は重要な課題である。本研究では、固体物性におけるトポロジーとこれまで発展されてきた数学的概念のリンクとなる実験的な計測法:量子光学の計測法を確立させ、新規物性の発見につながる実応用を目標として、研究を遂行してきた。測定に用いる材料には、トポロジカル物質、二次元材料もしくはそのハイブリッド構造を利用して、素子作製を行ってきた。それらの物質の作製法として、材料自体は、主に単結晶成長や単結晶へき開及びCVD法を用い、電子線リソグラフィー技術を精緻に行うことで素子構造の作製に成功した。また、ベリー曲率の証明に必要なそれら素子を用いた光電流計測技術に関してもほぼ成功しており、更なる研究の推進、例えば、MoTe2やWTe2に注目し、それらにおける光電流効果の観測が可能となる研究環境を整えることもできた。これら材料の結晶非対称性に由来する光電流の成分の特定は、トポロジカルな成分の分離を目指すことが可能となる。実際にMoTe2における光電流効果について結晶対称性に由来する光電流の2成分を観測に成功した。また、その温度変化を系統的に調べ、結晶構造相転移との相関を見極め、バンド構造のトポロジーの光電流成分を分離できる計測方法の開発を行うことも視野に入れている。以上のように、本研究では、トポロジカル物質の実験的な計測法:量子光学の計測法を確立し、光電流が測定材料の結晶非対称性、トポロジーに由来することを実験的に観測することに成功している。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (16 results)

All 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 10 results,  Invited: 10 results)

  • [Int'l Joint Research] パデュー大学(米国)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Highly skewed current phase relation in superconductor-topological insulator-superconductor Josephson junctions2020

    • Author(s)
      Kayyalha Morteza、Kazakov Aleksandr、Miotkowski Ireneusz、Khlebnikov Sergei、Rokhinson Leonid P.、Chen Yong P.
    • Journal Title

      npj Quantum Materials

      Volume: 5 Issue: 1 Pages: 1-7

    • DOI

      10.1038/s41535-020-0209-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Increased Curie temperature and enhanced perpendicular magneto anisotropy of Cr2Ge2Te6/NiO heterostructures2019

    • Author(s)
      H. Idzuchi, A. E. Llacsahuanga Allcca, X. C. Pan, K. Tanigaki, and Y. P. Chen
    • Journal Title

      Appl. Phys. Lett.

      Volume: 115 Issue: 23 Pages: 232403-232403

    • DOI

      10.1063/1.5130930

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Tuning Insulator-Semimetal Transitions in 3D Topological Insulator thin Films by Intersurface Hybridization and In-Plane Magnetic Fields2019

    • Author(s)
      Xu Yang、Jiang Guodong、Miotkowski Ireneusz、Biswas Rudro R.、Chen Yong P.
    • Journal Title

      Physical Review Letters

      Volume: 123 Issue: 20 Pages: 207701-207701

    • DOI

      10.1103/physrevlett.123.207701

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On the understanding of current-induced spin polarization of three-dimensional topological insulators2019

    • Author(s)
      Tian Jifa、Hong Seokmin、Sayed Shehrin、Lee Joon Sue、Datta Supriyo、Samarth Nitin、Chen Yong P.
    • Journal Title

      Nature Communications

      Volume: 10 Issue: 1 Pages: 1-3

    • DOI

      10.1038/s41467-019-09271-1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Differences in self-assembly of spherical C60 and planar PTCDA on rippled graphene surfaces2019

    • Author(s)
      Li Yanlong、Liu Xiaoyang、Chen Chuanhui、Duchamp James、Huang Rong、Chung Ting-Fung、Young Maxwell、Chalal Tarek、Chen Yong P.、Heflin James R.、Dorn Harry C.、Tao Chenggang
    • Journal Title

      Carbon

      Volume: 145 Pages: 549-555

    • DOI

      10.1016/j.carbon.2019.01.070

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Spin-helical Particles: An Enabling Platform for Quantum Matter and Quantum Technologies2019

    • Author(s)
      Yong P. Chen
    • Organizer
      Center for Quantum Research and Technology (CQRT) Seminar
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spin-helical Particles: An Enabling Platform for Quantum Matter and Quantum Technologies2019

    • Author(s)
      Yong P. Chen
    • Organizer
      Seminar at Fermi National Lab
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quantum Materials for sensing applications2019

    • Author(s)
      Yong P. Chen
    • Organizer
      Quantum Technologies and Sensing Workshop, IEEE Nuclear Science Symposium (NSS) and Medical-Imaging Conference (MIC)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spin-helical Particles: An Enabling Platform for Quantum Matter and Quantum Technologies2019

    • Author(s)
      Yong P. Chen
    • Organizer
      66th AVS (American Vacuum Society) International Symposium
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Topological protected quantum devices: from spin batteries to Josephson Junctions2019

    • Author(s)
      Yong P. Chen
    • Organizer
      CAMP (Condensed matter and Atomic/molecular physics) seminar
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Manipulating Dirac Cones - from twisted bilayer graphene to hybridized topological insulator2019

    • Author(s)
      Yong P. Chen
    • Organizer
      CarbonHagen 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Topological Josephson Junctions2019

    • Author(s)
      Yong P. Chen
    • Organizer
      AIMR Workshop “quantum materials and spintronics --- spin, topology and superconductivity”
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Realization of a symmetry protected bosonic topological state in a synthetic space2019

    • Author(s)
      Yong P. Chen
    • Organizer
      AIMR Workshop “quantum materials and spintronics --- spin, topology and superconductivity”
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Topological Josephson Junctions and Topological Superconductivity --- experimental studies of topological insulator/superconductor hybrid quantum devices2019

    • Author(s)
      Yong P. Chen
    • Organizer
      Seminar at RIKEN
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Topological Quantum Matter2019

    • Author(s)
      Yong P. Chen
    • Organizer
      Workshop on Topological Quantum Matter
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2018-04-23   Modified: 2021-01-27  

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