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BCS-BECクロスオーバーにおけるフェルミオン状態のスペクトル解析

Research Project

Project/Area Number 10J05605
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field 原子・分子・量子エレクトロニクス
Research InstitutionKeio University

Principal Investigator

渡邉 亮太  慶應義塾大学, 理工学研究科, 特別研究員(DC1)

Project Period (FY) 2010 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2012: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2011: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2010: ¥700,000 (Direct Cost: ¥700,000)
KeywordsBCS-BECクロスオーバー / フェルミ原子系超流動 / 擬ギャップ / 低次元性 / Fermi原子系超流動
Research Abstract

フェルミ原子気体のBCS-BECクロスオーバーにおける超流動性と強結合効果および擬ギャップ現象の関係性を明らかにするために、当該年度は1.3次元トラップ系フェルミ原子気体と2.2次元トラップ系フェルミ原子気体の解析を行った。
1.3次元トラップ系については、気体の1粒子状態と熱力学量の解析を行った。フェルミ原子気体の超流動相における状態密度とスペクトル強度およびphotoemissionスペクトルの解析と、熱力学量の解析を行った。その結果、実験的には矛盾すると考えられていたphotoemissionスペクトルの測定結果と熱力学量の測定結果が、強結合効果に由来する擬ギャップ現象によって統一的に説明されることを、当該分野で初めて示した。さらに、本内容を論文にまとめ、出版された。
2.1の議論を裏付けるために、近年測定された、2次元的にトラップされたフェルミ原子気体の常流動相における1粒子状態とphotoemissionスペクトルの解析を行った。
2次元系においては、強結合揺らぎの影響が、3次元系と比較して強くなり、より高温から顕著な擬ギャップ現象が生じることを示した。さらに、測定されたphotoemissionスペクトルを解析することによって、強結合効果とそれによる擬ギャップ現象によって定量的に説明されることを示した。この内容に関し、フランスとイギリスで行われた2回の国際会議と、横浜国立大学で行われた日本物理学会において成果報告を行った。

Report

(3 results)
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • Research Products

    (26 results)

All 2012 2011 2010

All Journal Article (11 results) (of which Peer Reviewed: 11 results) Presentation (15 results)

  • [Journal Article] Coexistence of superfluid gap and pseudogap in the BCS-BEC crossover regime of a trapped Fermi gas below T_c2012

    • Author(s)
      Ryota Watanabe, Shunji Tsuchiya, and Yoji Ohashi
    • Journal Title

      Physical Review A

      Volume: 86 Issue: 6 Pages: 063603-063603

    • DOI

      10.1103/physreva.86.063603

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin susceptibility and fluctuation corrections in the BCS-BEC crossover regime of an ultracold Fermi gas2012

    • Author(s)
      Takashi Kashimura, Ryota Watanabe, and Yoji Ohashi
    • Journal Title

      Physical Review A

      Volume: 86 Issue: 4

    • DOI

      10.1103/physreva.86.043622

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pseudogap phenomenon in an ultracold Fermi gas with a p-wave pairing interaction2012

    • Author(s)
      Daisuke Inotani, Ryota Watanabe, Manfred Sigrist, and Yoji Ohashi
    • Journal Title

      Physical Review A

      Volume: 85 Issue: 5

    • DOI

      10.1103/physreva.85.053628

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Erratum : Superfluid density of states and pseudogap phenomenon in the BCS-BEC crossover regime of a superfluid Fermi gas [Phys.Rev.A 82,043630(2010)]2012

    • Author(s)
      Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
    • Journal Title

      Physical Review A

      Volume: 85 Issue: 3

    • DOI

      10.1103/physreva.85.039908

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Theory of Photoemission-type Experiment in the BCS-BEC Crossover Regime of a Superfluid Fermi Gas2011

    • Author(s)
      Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
    • Journal Title

      IEEE-Xplore, "Access Spaces (ISAS), 2011 1st International Symposium on"

      Pages: 26-31

    • DOI

      10.1109/isas.2011.5960963

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pseudogap temperature and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas2011

    • Author(s)
      Shunji Tsuchiya, Ryota Watanabe, Yoji Ohashi
    • Journal Title

      Physical Review A

      Volume: 84 Issue: 4

    • DOI

      10.1103/physreva.84.043647

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pseudogap phenomenon in an ultracold Fermi gas with a p-wave interaction2011

    • Author(s)
      Daisuke Inotani, Ryota Watanabe, Manfred Sigrist, Yoji Ohashi
    • Journal Title

      IEEE-Xplore, "Access Spaces (ISAS), 2011 1st International Symposium on"

      Pages: 23-25

    • DOI

      10.1109/isas.2011.5960914

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 超流動Fermi原子気体の1粒子状態とphotoemissionスペクトル2011

    • Author(s)
      渡邉亮太
    • Journal Title

      素粒子論研究(電子版)

      Volume: 7 Pages: 54-63

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] p波相互作用するフェルミ気体における強結合効果と擬ギャップ構造2011

    • Author(s)
      猪谷太輔
    • Journal Title

      素粒子論研究(電子版)

      Volume: 7 Pages: 76-78

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superfluid density of states and pseudogap phenomenon in the BCS-BEC crossover regime of a superfluid Fermi gas2010

    • Author(s)
      Ryota Watanabe
    • Journal Title

      Physical Review A

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Photoemission spectrum and effect of inhomogeneous pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermigas2010

    • Author(s)
      Shunji Tsuchiya
    • Journal Title

      Physical Review A

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Presentation] 二次元常流動Fermi原子気体のBCS-BECクロスオーバーにおけるphotoemissionスペクトル2012

    • Author(s)
      渡邉亮太、土屋俊二、大橋洋士
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      2012-09-21
    • Related Report
      2012 Annual Research Report
  • [Presentation] Two-dimensional pseudogap effects of an ultracold Fermi gas in the BCS-BEC crossover region2012

    • Author(s)
      Ryota Watanabe, Shunji Tsuchiya, and Yoji Ohashi
    • Organizer
      QFS2012:International Conference on Quantum Fluids and Solids
    • Place of Presentation
      Lancaster University, United Kingdom
    • Year and Date
      2012-08-17
    • Related Report
      2012 Annual Research Report
  • [Presentation] Strong-coupling effects on photoemission spectra of two-dimensional Fermi gases in the BCS-BEC crossover2012

    • Author(s)
      Ryota Watanabe, Shunji Tsuchiya, and Yoji Ohashi
    • Organizer
      23rd International Conference on Atomic Physics(ICAP-2012)
    • Place of Presentation
      Ecole polytechnique, France
    • Year and Date
      2012-07-26
    • Related Report
      2012 Annual Research Report
  • [Presentation] 二次元冷却Fermi原子系の常流動相における強結合効果2012

    • Author(s)
      渡邉亮太
    • Organizer
      日本物理学会年次大会
    • Place of Presentation
      関西学院大学
    • Year and Date
      2012-03-24
    • Related Report
      2011 Annual Research Report
  • [Presentation] 冷却原子気体の熱力学量における強結合効果と擬ギャップ温度2012

    • Author(s)
      渡邉亮太
    • Organizer
      ワークショップ"Ultracold Gases : Superfluidity and Strong Correlation (USS-2012)"
    • Place of Presentation
      東京理科大学
    • Year and Date
      2012-01-11
    • Related Report
      2011 Annual Research Report
  • [Presentation] Pseudogap effects on photoemission spectra in the BCS-BEC crossover regime of atomic Fermi gases2011

    • Author(s)
      Ryota Watanabe
    • Organizer
      2nd Joint Meeting on Quantum NanoScience Keio University-GCOE/Delft University of Technology
    • Place of Presentation
      Delft University of Technology
    • Year and Date
      2011-11-21
    • Related Report
      2011 Annual Research Report
  • [Presentation] 冷却原子気体の擬ギャップ領域における熱力学量の解析2011

    • Author(s)
      渡邉亮太
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      富山大学
    • Year and Date
      2011-09-22
    • Related Report
      2011 Annual Research Report
  • [Presentation] Theory of Photoemission-type Experiment in the BCS-BEC Crossover Regime of a Superfluid Fermi Gas2011

    • Author(s)
      Ryota Watanabe
    • Organizer
      1st International Symposium on Access Spaces (IEEE-ISAS 2011)
    • Place of Presentation
      慶應義塾大学
    • Year and Date
      2011-06-18
    • Related Report
      2011 Annual Research Report
  • [Presentation] BCS-BECクロスオーバーにおける冷却原子気体の熱力学的性質と擬ギャップ現象2011

    • Author(s)
      渡邉亮太
    • Organizer
      日本物理学会年次大会
    • Place of Presentation
      新潟大学
    • Year and Date
      2011-03-25
    • Related Report
      2010 Annual Research Report
  • [Presentation] Single-particle Properties and Inhomogeneous Pseudogap Phenomena in a BCS-BEC Crossover Regime of a Trapped Fermi Gas2011

    • Author(s)
      Ryota Watanabe
    • Organizer
      ERATO MACROSCOPIC QUANTUM CONTROL CONFERENCE ON ULTRACOLD ATOMS AND MOLECULES
    • Place of Presentation
      東京大学(東京都)
    • Year and Date
      2011-01-24
    • Related Report
      2010 Annual Research Report
  • [Presentation] Photoemission spectroscopyによる超流動原子気体の理論解析2010

    • Author(s)
      渡邉亮太
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      大阪府立大学
    • Year and Date
      2010-09-24
    • Related Report
      2010 Annual Research Report
  • [Presentation] 超流動Fermi原子気体の1粒子状態とphotoemissionスペクトル2010

    • Author(s)
      渡邉亮太
    • Organizer
      熱場の量子論とその応用
    • Place of Presentation
      京都大学
    • Year and Date
      2010-08-30
    • Related Report
      2010 Annual Research Report
  • [Presentation] Strong Coupling Effects on the single-particle properties in the BCS-BEC Crossover Regime of Superfluid Fermi2010

    • Author(s)
      Ryota Watanabe
    • Organizer
      22^<nd> International Conference on Atomic Physics
    • Place of Presentation
      Cairns (Australia)
    • Year and Date
      2010-07-29
    • Related Report
      2010 Annual Research Report
  • [Presentation] Pseudogap Effects on Single-particle Properties in the BCS-BEC Crossover Regime of a Superfluid Fermi Gas2010

    • Author(s)
      Ryota Watanabe
    • Organizer
      Theory of Quantum Gases and Quantum Coherence
    • Place of Presentation
      Nice (France)
    • Year and Date
      2010-06-03
    • Related Report
      2010 Annual Research Report
  • [Presentation] STRONG PAIRING FLUCTUATIONS AND PSEUDOGAP EFFECTS ON THE SUPERFLUID DENSITY OF STATES IN THE BCS-BEC CROSSOVER REGIME OF AN ULTRACOLD FERMI GAS2010

    • Author(s)
      Ryota Watanabe
    • Organizer
      Ultracold Fermi Gas : Superfluidity and Strong-Correlation
    • Place of Presentation
      日本原子力開発機構(東京都)
    • Year and Date
      2010-05-14
    • Related Report
      2010 Annual Research Report

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Published: 2010-12-03   Modified: 2024-03-26  

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