globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2019.10.022
论文题名:
Oscillatory-like expansion of a Fermionic superfluid
作者: Wang X.-Q.; Wu Y.-P.; Liu X.-P.; Wang Y.-X.; Chen H.-Z.; Maraj M.; Deng Y.; Yao X.-C.; Chen Y.-A.; Pan J.-W.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期:1
起始页码: 7
结束页码: 11
语种: 英语
中文关键词: BEC-BCS crossover ; Equation-of-State ; Fermionic superfluid ; Oscillatory-like expansion
英文关键词: Electron gas ; Expansion ; Fermi level ; Fermions ; Hydrodynamics ; Temperature ; BEC-BCS crossover ; Equation of state ; Expansion behavior ; Expansion dynamics ; Fermionic superfluid ; Hydrodynamic expansion ; Optical dipole traps ; Superfluid hydrodynamics ; Equations of state
英文摘要: We study the expansion behaviors of a Fermionic superfluid in a cigar-shaped optical dipole trap for the whole BEC-BCS crossover and various temperatures. At low temperature (0.06(1)TF), the atom cloud undergoes an anisotropic hydrodynamic expansion over 30 ms, which behaves like oscillation in the horizontal plane. By analyzing the expansion dynamics according to the superfluid hydrodynamic equation, the effective polytropic index γ¯ of Equation-of-State (EoS) of Fermionic superfluid is extracted. The γ¯ values show a non-monotonic behavior over the BEC-BCS crossover, and have a good agreement with the theoretical results in the unitarity and BEC side. The normalized quasi-frequencies of the oscillatory expansion are measured, which drop significantly from the BEC side to the BCS side and reach a minimum value of 1.73 around 1/kFa=-0.25. Our work improves the understanding of the dynamic properties of strongly interacting Fermi gas. © 2019 Science China Press
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170077
Appears in Collections:气候变化与战略

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作者单位: Shanghai Branch, National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Shanghai, 201315, China; CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China

Recommended Citation:
Wang X.-Q.,Wu Y.-P.,Liu X.-P.,et al. Oscillatory-like expansion of a Fermionic superfluid[J]. Science Bulletin,2020-01-01,65(1)
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