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Detection and control of Majorana zero modes in topological insulator / superconductor heterojunctions

Research Project

Project/Area Number 19K23415
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionNational Institute of Advanced Industrial Science and Technology (2020-2021)
Tohoku University (2019)

Principal Investigator

Inoue Hisashi  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, 研究員 (90843342)

Project Period (FY) 2019-08-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsトポロジカル絶縁体 / ジョセフソン接合 / 超伝導 / マヨラナ粒子
Outline of Research at the Start

人工知能の発展やビッグデータの有効活用に向けて、量子力学に基づく高速な情報処理を可能にする量子計算技術が注目されている。トポロジカル絶縁体と超伝導体との接合に形成されるマヨラナ粒子は、揺動に強い量子計算実現の可能性を秘めている。本研究では、トポロジカル絶縁体と超伝導体との接合をトンネル分光測定することで、マヨラナ粒子の観測を確たるものにしつつ、制御手法の提唱に繋げる。未熟な研究状況を打破して世界に道筋を拓き、マヨラナ粒子を用いた量子計算プラットフォームの確立に大きく貢献する成果となる。

Outline of Final Research Achievements

Some material systems are believed to host Majorana zero modes - quantum charge-neutral states with their properties unexplored. Here we develop a Josephson junction with high-quality topological insulator thin films, aiming to observe the signature of Majorana zero modes and control their mysterious quantum states. We succeeded in precisely fabricating sub-micron-sized junctions and performing highly accurate measurements of these devices.

Academic Significance and Societal Importance of the Research Achievements

高品質なトポロジカル絶縁体薄膜と、トポロジカルジョセフソン素子等、微細素子の作製・評価技術の構築に関する実験を実施した。以上の成果により、物質中のマヨラナ粒子の観測と制御に向けた研究が前進するものと期待する。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] マサチューセッツ工科大学(米国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn2021

    • Author(s)
      Minyong Han, Hisashi Inoue, Shiang Fang, Caolan John, Linda Ye, Mun K. Chan, David Graf, Takehito Suzuki, Madhav Prasad Ghimire, Won Joon Cho, Efthimios Kaxiras, Joseph G. Checkelsky
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 5345-5345

    • DOI

      10.1038/s41467-021-25705-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Determination of the phase coherence length of PdCoO2 nanostructures by conductance fluctuation analysis2021

    • Author(s)
      Harada T.、Bredol P.、Inoue H.、Ito S.、Mannhart J.、Tsukazaki A.
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 4 Pages: 045123-045123

    • DOI

      10.1103/physrevb.103.045123

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Single-domain formation of SrMnBi2 films on polar LaAlO3 substrate2020

    • Author(s)
      Takahashi K.、Shiogai J.、Inoue H.、Ito S.、Kimura S.、Awaji S.、Tsukazaki A.
    • Journal Title

      AIP Advances

      Volume: 10 Issue: 10 Pages: 105216-105216

    • DOI

      10.1063/5.0021771

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two-dimensional growth of conductive ultra-thin Sn films on insulating substrate with an Fe buffer layer2020

    • Author(s)
      Zheng Dingheng、Shiogai Junichi、Inoue Hisashi、Souma Seigo、Sato Takafumi、Tsukazaki Atsushi
    • Journal Title

      APL Materials

      Volume: 8 Issue: 6 Pages: 061103-061103

    • DOI

      10.1063/5.0009012

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Tunneling spectroscopy of thin film antiferromagnetic kagome metal2022

    • Author(s)
      井上 悠, Minyong Han, Shiang Fang, Caolan John, Linda Ye, Mun K. Chan, David Graf, 鈴木健士, Madhav Prasad Ghimire, Won Joon Cho, Efthimios Kaxiras, Joseph G. Checkelsky
    • Organizer
      令和3年度 新学術領域研究「量子液晶の物性科学」領域研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] カゴメ金属ヘテロ構造に形成される二次元フラットバンドの観測2022

    • Author(s)
      井上 悠, Minyong Han, Shiang Fang, Caolan John, Linda Ye, Mun K. Chan, David E. Graf, 鈴木健士, Madhav Prasad Ghimire, Won Joon Cho, Efthimios Kaxiras, Joseph G. Checkelsky
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Chemical doping studies on thin film antiferromagnetic kagome metal FeSn2022

    • Author(s)
      Minyong Han, Caolan John, Madhav P Ghimire, Shiang Fang, Manuel Richter, Hisashi Inoue, Efthimios Kaxiras, Joseph G Checkelsky
    • Organizer
      APS March Meeting 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 分子線エピタキシー法によるSrMnBi2薄膜の単一ドメイン成長2021

    • Author(s)
      塩貝純一, 高橋翔, 井上悠, 伊藤俊, 木村尚次郎, 淡路智, 塚﨑敦
    • Organizer
      第140回金研講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Planar Schottky tunneling spectroscopy of antiferromagnetic kagome metal FeSn2021

    • Author(s)
      Minyong Han, Hisashi Inoue, Shiang Fang, Caolan John, Linda Ye, Mun K. Chan, David E Graf, Takehito Suzuki, Madhav Prasad Ghimire, Won Joon Cho, Efthimios Kaxiras, Joseph Checkelsky
    • Organizer
      APS March Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LaAlO3(100)基板の極性表面を利用したSrMnBi2薄膜の単一ドメイン成長2020

    • Author(s)
      塩貝 純一、高橋 翔、井上 悠、伊藤 俊、木村 尚次郎、淡路 智、塚﨑 敦
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 分子線エピタキシー法によるSrMnBi2薄膜の高品質化と伝導特性2020

    • Author(s)
      高橋翔, 塩貝純一, 井上悠, 塚﨑敦
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2020 Research-status Report

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Published: 2019-09-03   Modified: 2023-01-30  

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