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DOI10.1016/j.scib.2019.10.022
Oscillatory-like expansion of a Fermionic superfluid
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.
发表日期2020
ISSN20959273
起始页码7
结束页码11
卷号65期号:1
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
关键词BEC-BCS crossoverEquation-of-StateFermionic superfluidOscillatory-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
语种英语
来源期刊Science Bulletin
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/207221
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
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GB/T 7714
Wang X.-Q.,Wu Y.-P.,Liu X.-P.,et al. Oscillatory-like expansion of a Fermionic superfluid[J],2020,65(1).
APA Wang X.-Q..,Wu Y.-P..,Liu X.-P..,Wang Y.-X..,Chen H.-Z..,...&Pan J.-W..(2020).Oscillatory-like expansion of a Fermionic superfluid.Science Bulletin,65(1).
MLA Wang X.-Q.,et al."Oscillatory-like expansion of a Fermionic superfluid".Science Bulletin 65.1(2020).
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