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Study on current fluctuation due to electron correlations in nonequilibrium systems

Research Project

Project/Area Number 16K17723
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics I
Research InstitutionThe University of Tokyo

Principal Investigator

Sakano Rui  東京大学, 物性研究所, 助教 (00625022)

Research Collaborator OGURI Akira  
KOBAYASHI Kensuke  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords近藤効果 / 量子ドット / 非局所相関 / 量子輸送 / 量子相関 / 電子輸送 / フェルミ流体 / 繰り込まれた摂動論 / 電流交差相関 / 電流揺らぎ / 量子もつれ / 物性理論 / メゾスコピック系 / 強相関電子系
Outline of Final Research Achievements

We have investigated properties of a quantum many-body effect in artificial quantum systems that are made of nanoscale semiconductor-devices, by means of observation of current fluctuations. We elucidate the effects of symmetries of the device structure and properties of quantum entanglement due to the many-body effect. Specially, we theoretically and experimentally elucidate properties of corrections of the local Fermi liquid in nonlinear currents and current fluctuations due to the Kondo effect in a carbon nanotube quantum dot with tuning an applied magnetic field, a gate voltage, and couplings of electric leads. We also reveal properties of quantum entanglement that is excited by the Kondo effect in the electric current, and suggest a way to execute Bell's test of the nonlocal correlation of the entanglement.

Academic Significance and Societal Importance of the Research Achievements

本研究で調べられた近藤効果は、電子による多体効果の最も基本的な現象である。その現象の低エネルギーでの発現機構は50年以上に渡って徹底的に研究されてきて、すでによくわかっている。しかし、動的性質についてはまだ未解決で重要な問題が多く、今日まで研究が続いている。さらに、近藤効果の動的性質の理解を深めることは、物質の機能・性質を明らかにする重要な鍵となる。また、近藤効果は磁気モーメントなど電子の持つ特性に非常に敏感であり、ナノスケール素子で量子多体効果の制御と観測の成功は、電子の性質を利用する新しい微小デバイスの加工、制御技術の向上に大きく貢献すると考えられる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (30 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (3 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 5 results,  Acknowledgement Compliant: 1 results) Presentation (17 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results) Remarks (3 results)

  • [Int'l Joint Research] パリ南大学(フランス)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Universite de Paris-Sud(フランス)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Paris-Sud University(France)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Bell-state correlations of quasiparticle pairs in the nonlinear current of a local Fermi liquid2019

    • Author(s)
      Sakano Rui、Oguri Akira、Nishikawa Yunori、Abe Eisuke
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 15

    • DOI

      10.1103/physrevb.99.155106

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 平衡状態にある近藤効果(その1)非平衡グリーン関数入門2018

    • Author(s)
      阪野塁、小栗章
    • Journal Title

      固体物理

      Volume: 53 Pages: 279-303

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Current cross-correlation in the Anderson impurity model with exchange interaction2018

    • Author(s)
      Sakano Rui、Oguri Akira、Nishikawa Yunori、Abe Eisuke
    • Journal Title

      Physical Review B

      Volume: 97 Issue: 4 Pages: 045127-045140

    • DOI

      10.1103/physrevb.97.045127

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quantum Fluctuations along Symmetry Crossover in a Kondo-Correlated Quantum Dot2017

    • Author(s)
      Ferrier Meydi、Arakawa Tomonori、Hata Tokuro、Fujiwara Ryo、Delagrange Rapha?lle、Deblock Richard、Teratani Yoshimichi、Sakano Rui、Oguri Akira、Kobayashi Kensuke
    • Journal Title

      Physical Review Letters

      Volume: 118 Issue: 19 Pages: 196803-196803

    • DOI

      10.1103/physrevlett.118.196803

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] <講義ノート>非平衡電流ゆらぎでみる量子ドットの電子多体効果(第61回物性若手夏の学校 集中ゼミ)2017

    • Author(s)
      阪野塁
    • Journal Title

      物性研究・電子版

      Volume: 6 Issue: 4 Pages: 1-23

    • DOI

      10.14989/229030

    • NAID

      120006384182

    • Related Report
      2017 Research-status Report
    • Open Access
  • [Journal Article] Field-enhanced Kondo correlations in a half-filling nanotube dot: evolution of an SU(N) Fermi-liquid fixed point2016

    • Author(s)
      Y. Teratani, R. Sakano, R. Fujiwara, T. Hata, M. Ferrier, T. Arakawa, K. Kobayashi, and A. Oguri
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 85 Issue: 9 Pages: 0947181-18

    • DOI

      10.7566/jpsj.85.094718

    • NAID

      210000134101

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] 近藤効果の起こっている量子ドットの電荷状態の 電流ゆらぎによる検出実験2016

    • Author(s)
      阪野塁
    • Journal Title

      物性研だより

      Volume: 56 Pages: 17-19

    • Related Report
      2016 Research-status Report
    • Open Access
  • [Presentation] 3端子量子ドットに生成されたベル状態2019

    • Author(s)
      阪野塁, 小栗章
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Anderson不純物の非線形応答に対するトンネル結合の非対称性の効果2019

    • Author(s)
      堤和彦, 寺谷義道, 小栗章, 阪野塁
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] A measurable form of Bell's correlation of spin currents across a double dot in the Kondo regime2019

    • Author(s)
      Rui Sakano, Akira Oguri, Yunori Nishikawa, Eisuke Abe
    • Organizer
      American Physical Society March Meeting 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 多端子量子ドットのスピン電流の交差相関2019

    • Author(s)
      阪野塁
    • Organizer
      強相関電子系理論の最前線
    • Related Report
      2018 Annual Research Report
  • [Presentation] Spin current correlation in a three terminal quantum dot2019

    • Author(s)
      R. Sakano and A. Oguri
    • Organizer
      Topological Phases and Functionality of Correlated Electron Systems 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin current correlation in a three terminal quantum dot2018

    • Author(s)
      Rui Sakano
    • Organizer
      International Symposium on Frontiers of Quantum Transport in Nano Science
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] フェルミ流体のベル相関2018

    • Author(s)
      阪野塁
    • Organizer
      研究会&科研費報告会「メゾスコピック系における非平衡スピン輸送の微視的理解とその制御」
    • Related Report
      2018 Annual Research Report
  • [Presentation] 磁場によるSU(4)からSU(2)近藤状態へのクロスオーバー:NRGによる有限温度の解析2017

    • Author(s)
      寺谷義道, 小栗章, 阪野塁, Meydi Ferrier, 荒川智紀, 秦徳郎, 小林研介
    • Organizer
      日本物理学会
    • Place of Presentation
      大阪大学(大阪府・豊中市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Bell pair creation in current of Kondo-correlated dot2017

    • Author(s)
      Rui Sakano, Akira Oguri, Yunori Nishikawa, and Eisuke Abe
    • Organizer
      American Physical Society March Meeting
    • Place of Presentation
      New Orleans(USA)
    • Year and Date
      2017-03-13
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] NRG study of field induced crossover from SU(4) to SU(2) Kondo state in a carbon nanotube quantum dot2017

    • Author(s)
      Yoshimichi Teratani, Akira Oguri, Rui Sakano, Meydi Ferrier, Tokuro Hata, Tomonori Arakawa, and Kensuke Kobayashi
    • Organizer
      American Physical Society March Meeting
    • Place of Presentation
      New Orleans(USA)
    • Year and Date
      2017-03-13
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 結合非対称な近藤ドットの電流ノイズ2017

    • Author(s)
      阪野塁, 小栗章, 秦徳郎, 寺谷義道, Meydi Ferrier, 荒川智紀, 小林研介
    • Organizer
      日本物理学会2017年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 軌道縮退不純物アンダーソン模型の繰り込まれた摂動論2017

    • Author(s)
      阪野塁, 小栗章
    • Organizer
      日本物理学会2017年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Shot noise of spin and orbital Kondo effect in carbon nanotube quantum dot2016

    • Author(s)
      Rui Sakano
    • Organizer
      The Fourth NCTU-RIKEN Symposium on Physical and Chemical Science
    • Place of Presentation
      理研(埼玉県・和光市)
    • Year and Date
      2016-11-14
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 局所フェルミ流体のベル相関と完全計数統計2016

    • Author(s)
      阪野塁, 小栗章, 西川裕規, 阿部英介
    • Organizer
      日本物理学会
    • Place of Presentation
      金沢大学(石川県・金沢市)
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] カーボンナノチューブ量子ドットにおける近藤効果:スピン軌道相互作用とHund結合の影響2016

    • Author(s)
      寺谷義道, 小栗章, 阪野塁, Meydi Ferrier, 荒川智紀, 秦徳郎, 小林研介
    • Organizer
      日本物理学会
    • Place of Presentation
      金沢大学(石川県・金沢市)
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] SU(N)-M電子 近藤singlet状態の局所電子分布2016

    • Author(s)
      小栗章, 寺谷義道, 阪野塁, Meydi Ferrier, 荒川智紀, 秦徳郎, 小林研介
    • Organizer
      日本物理学会
    • Place of Presentation
      金沢大学(石川県・金沢市)
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] Field-Enhanced Kondo Correlations in a Half-Filling Nanotube Dot2016

    • Author(s)
      Yoshimichi Teratani, Akira Oguri, Rui Sakano,Meydi Ferrier, Tomonori Arakawa, Tokuro Hata, and Kensuke Kobayashi
    • Organizer
      Osaka City University and National Taiwan Normal University mini-workshop
    • Place of Presentation
      Taipei(Taiwan)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Remarks] ISSP Activity Report 2017

    • URL

      http://www.issp.u-tokyo.ac.jp/maincontents/docs/ar2017.pdf

    • Related Report
      2018 Annual Research Report
  • [Remarks] 近藤効果の内部構造と量子ゆらぎの解明に成功

    • URL

      http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=608

    • Related Report
      2017 Research-status Report
  • [Remarks] ISSP Activity Report 2015

    • URL

      http://www.issp.u-tokyo.ac.jp/maincontents/docs/ar2015_Part5.pdf

    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

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