Novel nonequilibrium dynamics of quantum degenerate gas exploited by spatiotemporal control of scattering length

• Project/Area Number: 17H02938
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Osaka City University
• Principal Investigator: Inouye Shin 大阪市立大学, 大学院理学研究科, 教授 (10401150)
• Co-Investigator(Kenkyū-buntansha): 竹内 宏光 大阪市立大学, 大学院理学研究科, 講師 (10587760)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000); Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2018: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000); Fiscal Year 2017: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
• Keywords: ボース・アインシュタイン凝縮体 / 量子エレクトロニクス / ボース・アインシュタイン凝縮 / 冷却原子 / フェッシュバッハ共鳴 / 混合気体 / 量子渦

Outline of Final Research Achievements

On the experimental side, we created a two-dimensional box potential and succeeded in confining the rubidium Bose-Einstein condensate. This system, together with our in-situ imaging, should serve as an ideal platform to clarify the phase separation process of binary BEC. On the theoretical side, we clarified the relationship between percolation theory and the ordering process of two-component BECs that phase separate. More specifically, when an immiscible two-component BEC undergoes phase separation, many domains appear. We found that the small domains show the behavior peculiar to quantum systems, while the large domains show the universal behavior according to the penetration theory.

Academic Significance and Societal Importance of the Research Achievements

水と油の相分離は日常に目にする興味深い現象の一つである。目に見えない分子のミクロの性質が、液体全体のマクロの振る舞いを決定している。では、液体が超流動を示したらどうなるだろう？分子の間の相互作用を自在に変えられたら相分離の様子は全く異なるものになるのだろうか？このような疑問に答えようとしたのが本研究である。実際に、原子気体のボースアインシュタイン凝縮体を使った実験装置を立ち上げた。さらに生じる液滴の大きさの分布について理論的に明らかにした。

Research Products

• [Int'l Joint Research] アントワープ大学(ベルギー)
• [Journal Article] Crossover between snake instability and Josephson instability of dark solitons in superfluid Fermi gases (2019)
  • Author(s): Van Alphen W.、Takeuchi H.、Tempere J.
  • Journal Title: Physical Review A Volume: 100 Issue: 2 Pages: 023628-023628
  • DOI: 10.1103/physreva.100.023628
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] On the Internal Structure of Smaller Domains in Domain Coarsening Dynamics of Spontaneous Z2-Symmetry Breaking in Two Dimensions (2018)
  • Author(s): Takeuchi Hiromitsu
  • Journal Title: Journal of Low Temperature Physics Volume: - Issue: 1-2 Pages: 314-320
  • DOI: 10.1007/s10909-018-02129-8
  • Peer Reviewed
• [Journal Article] Domain-area distribution anomaly in segregating multicomponent superfluids (2018)
  • Author(s): Hiromitsu Takeuchi
  • Journal Title: Physical Review A Volume: 97 Issue: 1
  • DOI: 10.1103/physreva.97.013617
  • NAID: 120006392620
  • Peer Reviewed
• [Journal Article] Is a double quantized vortex dynamically unstable in uniform superfluids? (2017)
  • Author(s): Hiromitsu Takeuchi, Michikazu Kobayashi and Kenichi Kasamatsu
  • Journal Title: Journal of Physical Society of Japan Volume: 87 Issue: 2 Pages: 023601-023601
  • DOI: 10.7566/jpsj.87.023601
  • Peer Reviewed
• [Presentation] Instability of a Doubly Quantized Vortex in Uniform Superfluids at Zero Temperature (2020)
  • Author(s): Hiromitsu Takeuchi, Michikazu Kobayashi, and Kenichi Kasamatsu
  • Organizer: Turbulence of all kinds, Osaka City University
  • Int'l Joint Research
• [Presentation] Dual species BEC in a 2D-box potential (2019)
  • Author(s): Janek Fleper, Kohei Kato, Shin Inouye
  • Organizer: 日本物理学会
• [Presentation] Length scale hierarchy in phase transition dynamics of spontaneous symmetry breaking in multi-component Bose-Einstein condensates (2019)
  • Author(s): Hiromitsu Takeuchi
  • Organizer: VORTEX DYNAMICS, TURBULENCE AND RELATED PHENOMENA IN QUANTUM FLUIDS, Natal, Brazil, 6.24-7.5 (2019)
  • Int'l Joint Research / Invited
• [Presentation] Phase Diagram of Solitons in a Spin-1 Polar Bose-Einstein Condensate (2019)
  • Author(s): I.-K. Liu, S.-G. Gou, and H. Takeuchi
  • Organizer: 28th International Laser Physics Workshop, Gyeongju, South Korea, 7. 8-12 (2019)
  • Int'l Joint Research
• [Presentation] Decay of Giant Vortices and Solitons in a Superfluid Fermi Gas (2019)
  • Author(s): W. Van Alphen, H. Takeuchi, S. N. Klimin, and J. Tempere
  • Organizer: 28th International Laser Physics Workshop, Gyeongju, South Korea, 7. 8-12 (2019)
  • Int'l Joint Research
• [Presentation] Critical percolation in early-stage quench dynamics with spontaneous discrete symmetry breaking in a two-dimensional Continuum (2019)
  • Author(s): H. Takeuchi, L. F. Cugliandolo, and M. Picco
  • Organizer: StatPhys27: Internatinal Conference Statistical Physics, Buenos Aires, Argentina, July, 8-12 (2019)
  • Int'l Joint Research
• [Presentation] Domain-area distribution in phase-separating two-component Bose-Einstein condensates (2019)
  • Author(s): H. Takeuchi
  • Organizer: StatPhys27: Internatinal Conference Statistical Physics, Buenos Aires, Argentina, July, 8-12 (2019)
  • Int'l Joint Research
• [Presentation] Is a doubly quantized vortex unstable in uniform Bose-Einstein condensates at zero temperature? (2018)
  • Author(s): Hiromitsu Takeuchi, Michikazu Kobayashi, Kenichi Kasamatsu
  • Organizer: Quantum Science Symposium Europe-2018 Meeting, Peterhouse, University of Cambridge, UK, 11. 5-6 (2018)
  • Int'l Joint Research / Invited
• [Presentation] 相分離する2成分超流体の秩序化過程 (2018)
  • Author(s): 竹内宏光
  • Organizer: 研究会「超流動3HeおよびスピノールBECにおけるトポロジカル相・励起」，近畿大学，東大阪キャンパス，12. 22-23 (2018)
  • Invited
• [Presentation] Instability of a Doubly Quantized Vortex in Uniform Superfluids at Zero Temperature (2018)
  • Author(s): H. Takeuchi, M. Kobayashi, and K. Kasamatsu
  • Organizer: QFS2018: Internatinal Conference on Quantum Fluids and Solids,Tokyo, July, 25-31 (2018)
  • Int'l Joint Research
• [Presentation] Anomalous hierarchy in domain coarsening dynamics of two-component Bose-Einstein condensates (2018)
  • Author(s): H. Takeuchi
  • Organizer: QFS2018: Internatinal Conference on Quantum Fluids and Solids,Tokyo, July, 25-31 (2018)
  • Int'l Joint Research
• [Presentation] Isotopic shift of atom-dimer Efimov resonances in K-Rb mixtures (2018)
  • Author(s): K. Kato, Yujun Wang, J. Kobayashi, Paul S. Julienne and S. Inouye
  • Organizer: ICAP 2018: The 26th International Conference on Atomic Physics Barcelona, Spain, July 22-27, 2018.
  • Int'l Joint Research
• [Presentation] 冷却原子における共鳴散乱：フェッシュバッハ共鳴とエフィモフ共鳴 (2018)
  • Author(s): 井上慎
  • Organizer: 原子衝突学会 第４３回年会（2018年10月14日）
  • Invited
• [Presentation] Efimov resonances in an ultracold mixture (2018)
  • Author(s): Shin Inouye
  • Organizer: QFS2018: Internatinal Conference on Quantum Fluids and Solids,Tokyo, July, 25-31 (2018)
  • Int'l Joint Research / Invited
• [Presentation] What can we do with a quantum degenerate mixture? (2018)
  • Author(s): Shin Inouye
  • Organizer: International Symposium in Honor of Professor Nambu for the 10th Anniversary of his Nobel Prize in Physics, Dec. 13, 2018
  • Int'l Joint Research / Invited
• [Presentation] ガスセルを用いたラビ周波数の空間イメージング (2018)
  • Author(s): 長谷秀秋, 加藤宏平, 井上慎
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] Splitting instability of a doubly quantized vortex in homogeneous superfluids (2018)
  • Author(s): Hiromitsu Takeuchi, Michikazu Kobayashi, Kenichi Kasamatsu
  • Organizer: APS March Meeting
  • Int'l Joint Research
• [Presentation] Application of percolation theory to coarsening dynamics of domains in segregating binary superfluids (2018)
  • Author(s): Hiromitsu Takeuchi
  • Organizer: FINESS2018-Finite Temperature Non-equilibrium Superfluid Systems
  • Int'l Joint Research
• [Presentation] 巻き数２の量子渦は動的に安定か？ (2018)
  • Author(s): 竹内宏光，小林未知数，笠松健一
  • Organizer: 日本物理学会，年次大会
• [Presentation] Splitting instability of a doubly quantized vortex in uniform Bose-Einstein condensates at zero temperature (2018)
  • Author(s): H. Takeuchi, M. Kobayashi, and K. Kasamatsu
  • Organizer: FINESS2018-Finite Temperature Non-equilibrium Superfluid Systems
  • Int'l Joint Research
• [Presentation] Domain-area distribution anomaly in segregating multi-component superfluids (2017)
  • Author(s): H. Takeuchi
  • Organizer: ULT2017: Frontiers of Low Temperature Physics
  • Int'l Joint Research
• [Presentation] Splitting instability of a doubly quantized vortex in homogeneous superfluids (2017)
  • Author(s): H. Takeuchi, M. Kobayashi, and K. Kasamatsu
  • Organizer: ULT2017: Frontiers of Low Temperature Physics
  • Int'l Joint Research
• [Presentation] Dynamic scaling law and phase ordering percolation in multicomponent superfluids (2017)
  • Author(s): H. Takeuchi
  • Organizer: LT28: 28th International Conference on Low Temperature Physics
  • Int'l Joint Research
• [Book] 量子流体力学 (2018)
  • Author(s): 坪田 誠、笠松 健一、小林 未知数、竹内 宏光
  • Total Pages: 338
  • Publisher: 丸善
  • ISBN: 4621302477