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Nonperturbative quantum effects in Dirac materials

Research Project

Project/Area Number 15H06023
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Condensed matter physics II
Research InstitutionTohoku University

Principal Investigator

Araki Yasufumi  東北大学, 学際科学フロンティア研究所, 助教 (10757131)

Co-Investigator(Renkei-kenkyūsha) NOMURA Kentaro  東北大学, 金属材料研究所, 准教授 (00455776)
Research Collaborator YOSHIDA Akihide  
Project Period (FY) 2015-08-28 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords物性理論 / 強相関電子系 / スピンエレクトロニクス / 半導体物性 / トポロジカル物質 / ディラック電子 / 磁壁 / 物性物理 / スピントロニクス / ディラック電子系 / トポロジカル絶縁体 / ワイル半金属 / 磁性 / スピン波 / 反強磁性体
Outline of Final Research Achievements

The goal of this project was to understand the interaction effects on electrons in "Dirac materials" including topological insulators and Dirac-Weyl semimetals, from the point of view of quantum field theory. I found the following three points: (1) The Coulomb interaction between electrons turns the system into an insulator, and renormalizes the electron Fermi velocity. (2) The exchange interaction between electron spins and local spins leads to a nontrivial effective exchange interaction between the local spins. (3) A magnetic domain wall formed in Weyl semimetals hosts a finite localized charge, and its motion can be driven by an external electric field.

Report

(3 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Annual Research Report
  • Research Products

    (17 results)

All 2017 2016 2015

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 2 results) Presentation (15 results) (of which Int'l Joint Research: 9 results,  Invited: 1 results)

  • [Journal Article] Universal charge and current on magnetic domain walls in Weyl semimetals2016

    • Author(s)
      Yasufumi Araki, Akihide Yoshida, Kentaro Nomura
    • Journal Title

      Physical Review B

      Volume: 94 Issue: 11 Pages: 115312-115312

    • DOI

      10.1103/physrevb.94.115312

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals2016

    • Author(s)
      Y. Araki, K. Nomura
    • Journal Title

      Phys. Rev. B

      Volume: 93 Issue: 9 Pages: 094438-094438

    • DOI

      10.1103/physrevb.93.094438

    • Related Report
      2016 Annual Research Report 2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Localized charge and current on magnetic domain walls in Weyl semimetals2017

    • Author(s)
      Yasufumi Araki, Akihide Yoshida, and Kentaro Nomura
    • Organizer
      APS March Meeting 2017
    • Place of Presentation
      New Orleans(米国ルイジアナ州)
    • Year and Date
      2017-03-13
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ワイル半金属における磁壁配位と局在電荷2017

    • Author(s)
      荒木康史
    • Organizer
      理研iTHES神戸量子物性研究会
    • Place of Presentation
      理化学研究所(兵庫県神戸市)
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] ワイル半金属中の磁壁に局在した普遍電荷および電流2016

    • Author(s)
      荒木康史、吉田光秀、野村健太郎
    • Organizer
      第2回「トポロジーが紡ぐ物質科学のフロンティア」領域研究会
    • Place of Presentation
      東北大学(宮城県仙台市)
    • Year and Date
      2016-12-16
    • Related Report
      2016 Annual Research Report
  • [Presentation] Universal charge and current on magnetic domain walls in Weyl semimetals2016

    • Author(s)
      Yasufumi Araki, Akihide Yoshida, and Kentaro Nomura
    • Organizer
      The electronic and optical properties of 2D and Dirac materials
    • Place of Presentation
      Jacksonville Beach(米国フロリダ州)
    • Year and Date
      2016-12-12
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bound states and charge transport on magnetic domain walls in Weyl semimetals2016

    • Author(s)
      Yasufumi Araki, Akihide Yoshida, and Kentaro Nomura
    • Organizer
      61st Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      New Orleans(米国ルイジアナ州)
    • Year and Date
      2016-10-31
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Universal charge and current on magnetic domain walls in Weyl semimetals2016

    • Author(s)
      Yasufumi Araki, Akihide Yoshida, and Kentaro Nomura
    • Organizer
      Physics of bulk-edge correspondence and its universality: From solid state physics to cold atoms
    • Place of Presentation
      京都大学基礎物理学研究所(京都府京都市)
    • Year and Date
      2016-09-27
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ワイル半金属における磁壁構造によるランダウ量子化とフェルミアーク状態2016

    • Author(s)
      荒木康史、吉田光秀、野村健太郎
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      金沢大学(石川県金沢市)
    • Year and Date
      2016-09-13
    • Related Report
      2016 Annual Research Report
  • [Presentation] Spin textures and spin-wave dispersion in magnetically-doped Dirac/Weyl semimetals2016

    • Author(s)
      Yasufumi Araki and Kentaro Nomura
    • Organizer
      ICPS 2016
    • Place of Presentation
      北京(中国)
    • Year and Date
      2016-07-31
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin textures and spin waves in magnetically-doped Dirac/Weyl semimetals2016

    • Author(s)
      Yasufumi Araki and Kentaro Nomura
    • Organizer
      The 22nd International Conference on High Magnetic Fields in Semiconductor Physics
    • Place of Presentation
      定山渓ビューホテル(北海道札幌市)
    • Year and Date
      2016-07-24
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin correlations and spin-wave excitations in Dirac-Weyl semimetals2016

    • Author(s)
      Yasufumi Araki and Kentaro Nomura
    • Organizer
      APS March Meeting 2016
    • Place of Presentation
      ボルチモア
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Carrier-mediated exchange interaction and spin waves in Dirac semimetals2016

    • Author(s)
      Yasufumi Araki and Kentaro Nomura
    • Organizer
      MMM-Intermag 2016 Joint Conference
    • Place of Presentation
      サンディエゴ
    • Year and Date
      2016-01-11
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ディラック・ワイル半金属におけるスピン相関とスピン波励起2015

    • Author(s)
      荒木康史、野村健太郎
    • Organizer
      第1回「トポロジーが紡ぐ物質科学のフロンティア」領域研究会
    • Place of Presentation
      京都
    • Year and Date
      2015-12-11
    • Related Report
      2015 Annual Research Report
  • [Presentation] Non-uniform magnetic structures and anisotropic spin wave dispersion in Dirac semimetals2015

    • Author(s)
      Yasufumi Araki and Kentaro Nomura
    • Organizer
      ISANN 2015 (International Symposium on Advanced Nanodevices and Nanotechnology)
    • Place of Presentation
      Waikoloa, Hawaii
    • Year and Date
      2015-11-29
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin correlations and spin waves in Dirac semimetals2015

    • Author(s)
      Yasufumi Araki and Kentaro Nomura
    • Organizer
      第9回 物性科学領域横断研究会
    • Place of Presentation
      東京
    • Year and Date
      2015-11-13
    • Related Report
      2015 Annual Research Report
  • [Presentation] ディラック半金属における電子相関と格子ゲージ理論2015

    • Author(s)
      荒木 康史
    • Organizer
      基研研究会 「熱場の量子論とその応用」
    • Place of Presentation
      京都
    • Year and Date
      2015-08-31
    • Related Report
      2015 Annual Research Report

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Published: 2015-08-26   Modified: 2020-05-15  

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