Consequence of superfluidity on the expansion of a rotating Bose-Einstein condensate

Details Consequence of superfluidity on the expansion of a rotating Bose-Einstein condensate Consequence of superfluidity on the expansion of a rotating Bose-Einstein condensate

2001-06-05

arxiv.org/abs/cond-mat/0106080v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.88.070405

We study the time evolution of a rotating condensate, that expands after being suddenly released from the confining trap, by solving the hydrodynamic equations of irrotational superfluids. For slow initial rotation speeds, $\Omega_{0}$, we find that the condensate's angular velocity increases rapidly to a maximum value and this is accompanied by a minimum in the deformation of the condensate in the rotating plane. During the expansion the sample makes a global rotation of approximately $\pi/2$, where the exact value depends on $\Omega_{0}$. This minimum deformation can serve as an easily detectable signature of superfluidity in a Bose--Einstein condensate.

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