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Novel superfluid phenomena in ultracold atomic gases

Research Project

Project/Area Number 16K05504
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Atomic/Molecular/Quantum electronics
Research InstitutionTokyo University of Science

Principal Investigator

Nikuni Tetsuro  東京理科大学, 理学部第一部物理学科, 教授 (50360160)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords冷却原子気体 / Bose凝縮 / Fermi超流動 / 集団励起 / 量子渦 / ソリトン / Bose凝縮体 / Fermi超流動体 / Higgsモード / Bose-Fermi混合気体 / 量子ウォーク / Fermi超流動気体 / Bogoliubov-de Genne方程式 / 量子渦格子 / 非線形効果 / 超流動
Outline of Final Research Achievements

We studied dynamics of ultracold quantum gases, in particular, Bose superfluids, a superfluid Fermi gas, and a Bose-Fermi mixture gas. As for the Bose superfluids, we studied nonlinear mode-coupling effects in the collective modes, effect of the thermal cloud in vortex lattice formation, decay of a dark soliton in a two-dimensional trap. As for the superfluid Fermi gas, we studied the Higgs mode associated with the amplitude oscillations of the superfluid order parameter in the entire region of BCS-BEC crossover, Finally, we studied collective excitations in a Bose-Fermi mixture gas above the superfluid transition temperature to clarify the effect of the quantum statistics on the dynamical property of the system.

Academic Significance and Societal Importance of the Research Achievements

高い制御性を持ち、微視的理論と実験の定量的な比較が可能な冷却原子の研究によって、量子多体系の基礎理論に関する理解が深まることが期待される。また、冷却原子における超流動現象は電気抵抗がゼロとなる超伝導と類似した現象である。超伝導現象を利用した様々な新しい技術が開発されているが、冷却原子気体における超流動ダイナミクスを詳細に理解することにより、新しいタイプの超伝導体の開発や高温超伝導メカニズムの解明につながることが期待される。

Report

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

    (27 results)

All 2019 2018 2017 2016 Other

All Journal Article (8 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (16 results) (of which Int'l Joint Research: 7 results) Remarks (3 results)

  • [Journal Article] Excitation of Higgs Mode in Superfluid Fermi Gas in BCS?BEC Crossover2019

    • Author(s)
      Tokimoto Jun, Tsuchiya Shunji, Nikuni Tetsuro
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 88 Issue: 2 Pages: 023601-023601

    • DOI

      10.7566/jpsj.88.023601

    • NAID

      40021809992

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Decay of Phase-Imprinted Dark Soliton in Bose-Einstein Condensate at Nonzero Temperature2019

    • Author(s)
      Hiroki Ohya、Shohei Watabe、Tetsuro Nikuni
    • Journal Title

      Journal of Low Temperature Physics

      Volume: - Issue: 1-2 Pages: 140-146

    • DOI

      10.1007/s10909-019-02180-z

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spatial Search on Sierpinski Carpet Using Quantum Walk2018

    • Author(s)
      Shu Tamegai, Shohei Watabe, Tetsuro Nikuni
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 87 Issue: 8 Pages: 085003-085003

    • DOI

      10.7566/jpsj.87.085003

    • NAID

      210000134933

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Collective Excitations in Bose-Fermi Mixtures2018

    • Author(s)
      Yoji Asano, Masato Narushima, Shohei Watabe, Tetsuro Nikuni
    • Journal Title

      Journal of Low Temperature Physics

      Volume: - Issue: 1-2 Pages: 133-139

    • DOI

      10.1007/s10909-018-2105-y

    • NAID

      130007648718

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Density and spin modes in imbalanced normal Fermi gases from collisionless to hydrodynamic regime2018

    • Author(s)
      Narushima Masato、Watabe Shohei、Nikuni Tetsuro
    • Journal Title

      Journal of Physics B: Atomic, Molecular and Optical Physics

      Volume: 51 Issue: 5 Pages: 055202-055202

    • DOI

      10.1088/1361-6455/aaa594

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 高速デシメーションアルゴリズムの開発 ~ スパース2パラメータボルツマンマシンをベンチマーク関数として ~2018

    • Author(s)
      元木大介、渡部昌平、二国徹郎
    • Journal Title

      電子情報通信学会技術研究報告

      Volume: 117 Pages: 91-95

    • Related Report
      2017 Research-status Report
    • Open Access
  • [Journal Article] Higgs Mode in a Trapped Superfluid Fermi Gas2017

    • Author(s)
      Jun Tokimoto, Shunji Tsuchiya, Tetsuro Nikuni
    • Journal Title

      Journal of Low Temperature Physics

      Volume: - Issue: 5-6 Pages: 765-768

    • DOI

      10.1007/s10909-017-1766-2

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] Nonlinear mixing of collective modes in harmonically trapped Bose-Einstein condensates2017

    • Author(s)
      Takahiro Mizoguchi, Shohei Watabe, Tetsuro Nikuni
    • Journal Title

      Physical Review A

      Volume: 95 Issue: 3 Pages: 033623-033623

    • DOI

      10.1103/physreva.95.033623

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] Scaling Hypothesis of Spatial Search on Fractal Lattice Using Quantum Walk2019

    • Author(s)
      Shohei Watabe, Shu Tamegai, Rei Sato, Tetsuro Nikuni
    • Organizer
      APS March Meeting 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 子ウォークを用いたフラクタル格子上の空間探索2019

    • Author(s)
      佐藤嶺, 為我井脩, 渡部昌平, 二国徹郎
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 調和トラップ中のBose-Fermi混合気体における集団振動の解析2019

    • Author(s)
      麻野曜司, 渡部昌平, 二国徹郎
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 双極子ボースハバードモデルの有限温度効果と相図2019

    • Author(s)
      田村和大, 渡部昌平, 二国徹郎
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Higgs mode in a superfluid Fermi gas in the BCS-BEC crossover2018

    • Author(s)
      Jun Tokimoto, Shunji Tsuchiya, Tetsuro Nikuni
    • Organizer
      49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Collective Excitations in Bose-Fermi Mixtures2018

    • Author(s)
      Asano, Masato Narushima, Shohei Watabe, and Tetsuro Nikuni
    • Organizer
      International Symposium on Quantum Fluids and Solids (QFS2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Higgs mode in a superfluid Fermi gas in the BCS-BEC crossover2018

    • Author(s)
      Higgs mode in a superfluid Fermi gas in the BCS-BEC crossover
    • Organizer
      International Symposium on Quantum Fluids and Solids (QFS2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高速デシメーションアルゴリズムの開発 ~ スパース2パラメータボルツマンマシンをベンチマーク関数として ~2018

    • Author(s)
      元木大介、渡部昌平、二国徹郎
    • Organizer
      情報論的学習理論と機械学習 (IBISML) 研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] 回転するBose原子気体の蒸発冷却シミュレーション2018

    • Author(s)
      荒畑恵美子、二国徹郎
    • Organizer
      日本物理学会
    • Related Report
      2017 Research-status Report
  • [Presentation] Bose-Fermi混合気体の集団励起2018

    • Author(s)
      麻野曜司, 飯島祐樹, 成嶌優人, 渡部昌平, 二国徹郎
    • Organizer
      日本物理学会
    • Related Report
      2017 Research-status Report
  • [Presentation] 有限温度における超流動Bose原子気体の量子渦格子形成シミュレーション2017

    • Author(s)
      荒畑恵美子、二国徹郎
    • Organizer
      日本物理学会
    • Place of Presentation
      大阪大学、豊中キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] BCS-BECクロスオーバーにおける質量及び粒子数Imbalanceの解析2017

    • Author(s)
      秋山雅治、 渡部昌平、 二国徹郎
    • Organizer
      日本物理学会
    • Place of Presentation
      大阪大学、豊中キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Fermi超流動気体のBCS-BECクロスオーバーにおける動的密度・スピン応答関数の性質2017

    • Author(s)
      麻野曜司、武田陸歩、渡部昌平、二国徹郎
    • Organizer
      日本物理学会
    • Place of Presentation
      大阪大学、豊中キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Formation of vortex lattices in superfluid bose gases at finite temperatures2017

    • Author(s)
      荒畑恵美子、二国徹郎
    • Organizer
      28th International Conference on Low Temperature Physics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Higgs mode in a trapped Fermi gas2017

    • Author(s)
      時本純、土屋俊二、二国徹郎
    • Organizer
      28th International Conference on Low Temperature Physics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Higgs mode in a trapped superfluid Fermi gas2016

    • Author(s)
      時本純、土屋俊二、二国徹郎
    • Organizer
      International Conference on Quantum Fluids and Solids
    • Place of Presentation
      Prague、Czech Republic
    • Year and Date
      2016-08-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Remarks] Nikuni Group

    • URL

      https://www.rs.tus.ac.jp/~nikunigroup/

    • Related Report
      2018 Annual Research Report
  • [Remarks] Nikuni Group

    • URL

      http://bosenikuni.ph.kagu.tus.ac.jp

    • Related Report
      2017 Research-status Report
  • [Remarks] 二国 徹郎 | 教員プロフィール | 東京理科大学

    • URL

      https://www.tus.ac.jp/fac_grad/p/index.php?3b4d

    • Related Report
      2017 Research-status Report

URL: 

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

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