• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Generation of current-induced spin polarization due to the locally-broken spatial inversion symmetry

Research Project

Project/Area Number 21K03413
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionHokkaido University

Principal Investigator

AKERA Hiroshi  北海道大学, 工学研究院, 教授 (20184129)

Co-Investigator(Kenkyū-buntansha) 江上 喜幸  北海道大学, 工学研究院, 助教 (20397631)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsスピントロニクス / 原子鎖 / 量子井戸 / 磁性半導体 / 原子層
Outline of Research at the Start

局所的空間反転対称性は、物理学の基本概念として、また反強磁性スピントロニクス実用化への期待から、多方面の研究者の注目を集め物性物理学の中の一つの研究分野に発展しつつあるが、この対称性が破れているときに生じる局所的電流誘起スピン偏極の大きさが何によって決まっているのかという基本的な問いへの答えは未だ得られていない。本研究では、この「決定要素」として空間反転対称性が破れている原子における電子経路の折れ曲がりに着目し、原子内に誘起されるスピン偏極の大きさが経路の曲率にどのように依存するかを解明する。

Outline of Final Research Achievements

A system with broken spatial inversion symmetry produces the polarization of the spin angular momentum in the presence of current (current-induced spin polarization, CISP), while a system with the spatial inversion symmetry broken locally around an atom exhibits the CISP at the atom. This work has focused on a fundamental helical system, that is an atomic chain along a helix, and shown that the local CISP at each atom strongly depends on the curvature and the torsion which determine the extent of broken spatial inversion symmetry at each atom. Moreover it is found that the helical atomic chain exhibits the spin-velocity locking in which the spin orientation is determined by the direction of electron motion. This locking realizes the current with a high spin polarization at low enough temperatures.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は、基本系としての螺旋状原子鎖を対象に、系の空間反転対称性の破れの度合いを表す曲率・捩率と電流誘起スピン偏極との間の関係を解明したという物理学上の意義をもつとともに、電流誘起スピン偏極と電流のスピン偏極度という特性を向上させるための指針として工学的意義をもつ。電流誘起スピン偏極から取り出されるスピン流やスピン偏極電流はスピントロニクスにおいて磁化反転に用いられているので社会的にも波及効果が期待できる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (27 results)

All 2024 2023 2022 2021

All Journal Article (9 results) (of which Peer Reviewed: 9 results,  Open Access: 6 results) Presentation (18 results) (of which Int'l Joint Research: 8 results)

  • [Journal Article] Antiparallel Spin Polarization and Spin Current Induced by Thermal Current and Locally Broken Inversion Symmetry in a Double‐Quantum Well Structure2024

    • Author(s)
      Suzuki Yuta、Kitagawa Yuma、Tezuka Shin‐ichiro、Akera Hiroshi
    • Journal Title

      physica status solidi (RRL)

      Volume: 18 Issue: 4

    • DOI

      10.1002/pssr.202300433

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin-velocity locking in a helical chain of atomic p+- orbitals2023

    • Author(s)
      Kashiwa Shinnosuke、Akera Hiroshi
    • Journal Title

      The Journal of Chemical Physics

      Volume: 158 Issue: 21

    • DOI

      10.1063/5.0152103

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Coupling of orbital and spin polarizations to interatomic hopping in a helical atomic chain2023

    • Author(s)
      Yatabe Yuya、Akera Hiroshi
    • Journal Title

      The Journal of Chemical Physics

      Volume: 159 Issue: 7

    • DOI

      10.1063/5.0156461

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin current between buckled atomic layers with a twist generated by locally broken inversion symmetry2023

    • Author(s)
      Kitagawa Yuma、Suzuki Yuta、Tezuka Shin-ichiro、Akera Hiroshi
    • Journal Title

      Physical Review B

      Volume: 108 Issue: 11

    • DOI

      10.1103/physrevb.108.115431

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Antiparallel Spin Polarization Induced by Current in a Bilayer2023

    • Author(s)
      Kato Takahiro、Akera Hiroshi
    • Journal Title

      physica status solidi (b)

      Volume: 260 Issue: 12

    • DOI

      10.1002/pssb.202300237

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin-current generation from local spin polarization induced by current through local inversion asymmetry: Double quantum well structure2023

    • Author(s)
      Suzuki Yuta、Kitagawa Yuma、Tezuka Shin-ichiro、Akera Hiroshi
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 11

    • DOI

      10.1103/physrevb.107.115306

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] AC response of spin-pseudospin current in a double quantum well2022

    • Author(s)
      Ishikawa Toshiya、Akera Hiroshi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 61 Issue: 6 Pages: 063002-063002

    • DOI

      10.35848/1347-4065/ac6644

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spin splitting of the conduction band by exchange interaction in the valence band through a k・p interband process in ferromagnetic semiconductors2022

    • Author(s)
      Hayashida Kenji、Akera Hiroshi
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 23 Pages: 235203-235203

    • DOI

      10.1103/physrevb.105.235203

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Orbital and spin polarizations induced by current through a helical atomic chain2021

    • Author(s)
      Otsuto Ryosuke、Yatabe Yuya、Akera Hiroshi
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 3

    • DOI

      10.1103/physrevb.104.035431

    • NAID

      120007145353

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Spin-velocity locking originating from the helical symmetry2023

    • Author(s)
      Hiroshi Akera
    • Organizer
      25th International Conference on the Electronic Properties of Two-Dimensional Systems
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-velocity locking originating from the helical symmetry2023

    • Author(s)
      Hiroshi Akera
    • Organizer
      Gordon Research Conference: Electron Spin Interactions with Chiral Molecules and Materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 二重量子井戸構造における局所的熱流誘起スピン偏極とスピン流2023

    • Author(s)
      鈴木雄太, 北川雄真, 手塚信一郎, 明楽浩史
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Exchange-Induced Spin-Orbit Interaction in Conduction Band by Valence Band Exchange interaction through k・p mechanism2022

    • Author(s)
      Kenji Hayashida, Hiroshi Akera
    • Organizer
      29th International Conference on Low Temperature Physics (LT29)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spin Current Generated by Antiparallel Current-Induced Spin Polarization in Double Quantum Wells2022

    • Author(s)
      Yuta Suzuki, Yuma Kitagawa, Shin-ichiro Tezuka, Hiroshi Akera
    • Organizer
      29th International Conference on Low Temperature Physics (LT29)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interlayer Spin Current in Twisted Bilayer Silicene Generated by Local Current-Induced Spin Polarization2022

    • Author(s)
      Yuma Kitagawa, Yuta Suzuki, Shin-ichiro Tezuka, Hiroshi Akera
    • Organizer
      29th International Conference on Low Temperature Physics (LT29)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spin-Velocity Locking in a Helical Atomic Chain2022

    • Author(s)
      Shinnosuke Kashiwa, Hiroshi Akera
    • Organizer
      29th International Conference on Low Temperature Physics (LT29)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Theory of Exchange Spin-Orbit Coupling2022

    • Author(s)
      Kenji Hayashida, Hiroshi Akera
    • Organizer
      Workshop on Innovative Nanoscale Devices and Systems (WINDS)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] n型強磁性半導体のキュリー温度に関する平均場理論2022

    • Author(s)
      林田健二, 明楽浩史
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] らせん状原子鎖における電流誘起スピン偏極・軌道偏極とスピン流・軌道流2022

    • Author(s)
      明楽浩史
    • Organizer
      ISSPワークショップ「カイラル物質科学の新展開」
    • Related Report
      2022 Research-status Report
  • [Presentation] 二重量子井戸構造における局所的スピン偏極とスピン流2022

    • Author(s)
      鈴木雄太, 北川雄真, 手塚信一郎, 明楽浩史
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] らせん状原子鎖におけるスピンの運動方向依存性2022

    • Author(s)
      柏慎之介, 明楽浩史
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] n 型強磁性半導体における伝導電子の価電子帯交換相互作用による内因性異常ホール効果2022

    • Author(s)
      林田健二, 明楽浩史
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 空間反転対称性の破れたハニカム格子を有する原子層積層構造における層間スピン流2022

    • Author(s)
      北川雄真, 鈴木雄太, 手塚信一郎, 明楽浩史
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] k・p Approach to p-d Exchange Induced Spin Splitting of Conduction Band2021

    • Author(s)
      Kenji Hayashida, Hiroshi Akera
    • Organizer
      EP2DS-24/MSS-20 Joint Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 同種のIV族原子層から成るツイスト積層構造における層間スピン流2021

    • Author(s)
      北川雄真, 鈴木雄太, 手塚信一郎, 明楽浩史
    • Organizer
      日本物理学会 2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 二重量子井戸における電流誘起スピン偏極によるスピン流生成2021

    • Author(s)
      鈴木雄太, 北川雄真, 手塚信一郎, 明楽浩史
    • Organizer
      日本物理学会 2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Ⅴ族原子層における電流誘起スピン偏極2021

    • Author(s)
      氏家勇, 明楽浩史
    • Organizer
      日本物理学会 2021年秋季大会
    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi