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Theoretical studies on quantum pumping effect encircling the Liouvillian exceptional point

Research Project

Project/Area Number 19K14611
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
Research InstitutionUniversity of Yamanashi

Principal Investigator

Hashimoto Kazunari  山梨大学, 大学院総合研究部, 准教授 (10754591)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords非エルミート / 例外点 / メゾスコピック系 / 開放量子系 / リウビリアン / 電流ノイズ / 非エルミート系 / スピンポンピング / 量子ドット / 電子輸送 / 非平衡統計力学 / 量子輸送 / 量子ポンピング / トポロジカル不変量 / トポロジカル量子ポンプ
Outline of Research at the Start

量子ポンプは開放量子系の制御変数群(環境温度・ゲート電圧等)を周期的に変化させることで,ゼロバイアス下でも量子を輸送でき,多方面への応用が期待されている.しかし,量子スケールでは制御変数の値は常に揺らいでいるため,量子輸送の精密な制御は困難である.この困難を克服するため,本研究では例外点と呼ばれる非エルミート系特有の縮退点を取り囲む経路に関するトポロジカル不変な位相因子に着目し,種々の開放量子系に対して適用可能な新奇なトポロジカル量子ポンピングのプロトコルを理論的に提案する.もって,制御変数の揺らぎに対して堅牢な量子ポンプをデザインするための指導原理を構築する.

Outline of Final Research Achievements

I have studied the physical effects of Liouvillian exceptional points on the electron transport in a mesoscopic system consisting of two electrodes and a coupled quantum dot. In the study of the effect on electron pumping effects, I analyzed the effect on non-adiabatic electron pumping including the effect of relaxation modes, considering that the exception point appears in relaxation modes with finite real part (relaxation rate), and clarified the existence of Landau-Zener oscillations in the transient electron flow caused by the exception point. In addition, in the study of the effect on the steady-state current noise, it was found that the exceptional point gives a non-Lorentzian lineshape to the noise spectrum.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、メゾスコピック系の電子輸送という基礎的にも応用上も重要な物理現象に対するリウビリアン例外点の影響を明らかにした点にあると考える.特に、定常電流ノイズスペクトル線形と例外点の次数との対応関係の発見は、メゾスコピック系におけるリウビリアン例外点の実験的検出および分析において定常電流ノイズが有用なツールであることを初めて指摘したものであり、今後のリウビリアン例外点の実験的研究への波及効果が期待できる.

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (27 results)

All 2024 2023 2022 2021 2020 2019 Other

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (21 results) (of which Int'l Joint Research: 9 results,  Invited: 2 results) Remarks (1 results)

  • [Journal Article] Effect of Quantum Coherence on Landauer’s Principle2022

    • Author(s)
      Hashimoto Kazunari、Uchiyama Chikako
    • Journal Title

      Entropy

      Volume: 24 Issue: 4 Pages: 548-548

    • DOI

      10.3390/e24040548

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Non-Markovian effect on quantum Otto engine: Role of system-reservoir interaction2021

    • Author(s)
      Shirai Yuji、Hashimoto Kazunari、Tezuka Ryuta、Uchiyama Chikako、Hatano Naomichi
    • Journal Title

      Physical Review Research

      Volume: 3 Issue: 2 Pages: 023078-023078

    • DOI

      10.1103/physrevresearch.3.023078

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Lower bounds for the mean dissipated heat in an open quantum system2020

    • Author(s)
      Kazunari Hashimoto, Bassano Vacchini, and Chikako Uchiyama
    • Journal Title

      Physical Review A

      Volume: 101 Issue: 5 Pages: 052114-052114

    • DOI

      10.1103/physreva.101.052114

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nonadiabaticity in Quantum Pumping Phenomena under Relaxation2019

    • Author(s)
      Hashimoto Kazunari、Uchiyama Chikako
    • Journal Title

      Entropy

      Volume: 21 Issue: 9 Pages: 842-842

    • DOI

      10.3390/e21090842

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin backflow: A non-Markovian effect on spin pumping2019

    • Author(s)
      Kazunari Hashimoto, Gen Tatara, Chikako Uchiyama
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 20 Pages: 205304-205304

    • DOI

      10.1103/physrevb.99.205304

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Signature of Liouvillian exceptional point in stationary current noise2024

    • Author(s)
      Kazunari Hashimoto
    • Organizer
      American Physical Society March Meeting 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 2重量子ドット系の非断熱量子ポンピングに対するリウビリアン例外点の影響2024

    • Author(s)
      橋本一成
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Signature of Liouvillian exceptional point in stationary current noise2023

    • Author(s)
      Kazunari Hashimoto
    • Organizer
      20th International Workshop on Pseudo-Hermitian Hamiltonians in Quantum Physics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] メゾスコピック系の非平衡定常流に対するリウビリアン例外点の影響2023

    • Author(s)
      橋本一成
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] スピンポンピングに対する電子間相互作用の影響2023

    • Author(s)
      橋本一成
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 回転磁場による非断熱スピンポンピング2022

    • Author(s)
      橋本一成
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Non-adiabatic spin pumping driven by a rotating magnetic field2022

    • Author(s)
      Kazunari Hashimoto
    • Organizer
      International Workshop on Physics and Chemistry of Electronic Materials
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Non-adiabatic spin pumping induced by periodic magnetic field: a master equation approach2022

    • Author(s)
      Kazunari Hashimoto
    • Organizer
      REIMEI Workshop on “Open quantum mechanics in nuclear, hadron and condensed-matter systems”
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] メゾスコピック系の電流ノイズに対する例外点の影響2021

    • Author(s)
      橋本一成
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 非断熱電子ポンピングに対する例外点の影響2021

    • Author(s)
      橋本一成
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 共通熱浴を介したスピン間の同期現象―複素スペクトル解析―2021

    • Author(s)
      加藤光生,橋本一成,内山智香子
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 環境ノイズを活用した量子エネルギー輸送制御2021

    • Author(s)
      田之口美秋,橋本一成,内山智香子
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 2準位系を介した電子輸送における輸送経路干渉と例外点2020

    • Author(s)
      橋本一成
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 共通熱浴を介した複数スピン群間の同期現象2020

    • Author(s)
      加藤光生,橋本一成,内山智香子
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Spin backflow: a non-Markovian effect on spin pumping2020

    • Author(s)
      Kazunari Hashimoto, Gen Tatara, Chikako Uchiyama
    • Organizer
      6th International Workshop on Statistical Physics and Mathematics for Complex Systems
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Non-Markovian effect on spin and charge pumping2019

    • Author(s)
      Kazunari Hashimoto, Chikako Uchiyama
    • Organizer
      Quantum Information Processing in Non-Markovian Quantum Complex Systems
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 非断熱スピンポンピングに対するクーロン相互作用の影響2019

    • Author(s)
      山本陽之, 橋本一成, 内山智香子
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Non-adiabatic electron pumping by bias voltage modulation2019

    • Author(s)
      Kazunari Hashimoto, Chikako Uchiyama
    • Organizer
      International Symposium on Hybrid Quantum Systems 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interaction effect on spin pumping under magnetic precession2019

    • Author(s)
      Haruyuki Yamamoto, Kazunari Hashimoto, Chikako Uchiyama
    • Organizer
      International Symposium on Hybrid Quantum Systems 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 電位の連続周期変調による非断熱電子ポンピング2019

    • Author(s)
      橋本一成, 内山智香子
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Spin backflow: a non-Markovian effect on spin pumping2019

    • Author(s)
      Kazunari Hashimoto, Gen Tatara, Chikako Uchiyama
    • Organizer
      Frontiers of Quantum and Mesoscopic Thermodynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 量子開放系動力学研究室ホームページ

    • URL

      http://www.openqsys.yamanashi.ac.jp/

    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2025-01-30  

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