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Oscillatory Quadrupole-like Expansion of a Fermionic Superfluid | | Yu-Ping Wu
; Xing-Can Yao
; Xiang-Pei Liu
; Xiao-Qiong Wang
; Yu-Xuan Wang
; Hao-Ze Chen
; Mudassar Maraj
; Youjin Deng
; Yu-Ao Chen
; Jian-Wei Pan
; | | Date: |
27 Feb 2017 | | Abstract: | We prepare a Fermionic superfluid of about $5 imes 10^6$ $^6$Li atoms in a
cigar-shaped optical dipole trap and demonstrate that in the weak residual
magnetic field curvature, the atom cloud undergoes an oscillatory
quadrupole-like expansion over 30~ms. By analyzing the expansion dynamics
according to the superfluid hydrodynamic equation, we derive several parameters
characterizing quantum state of the trapped Fermionic superfluid, including the
Bertsch parameter $xi$ at unitarity and the effective polytropic index
$overline{gamma}$ over the whole BEC-BCS crossover. The experimental estimate
$xi=0.42(2)$ agrees well with the quantum Monte Carlo calculation $0.42(1)$.
The $overline{gamma}$ values show a nonmonotonic behavior as a function of
interaction strength, and reduce to the well-known theoretical results in the
BEC, BCS and unitary limits. | | Source: | arXiv, 1702.8326 | | Services: | Forum | Review | PDF | Favorites | |
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