Monday, April 30, 2012

1204.6183 (Romain Dubessy et al.)

Critical Rotation of an Annular Superfluid Bose Gas    [PDF]

Romain Dubessy, Thomas Liennard, Paolo Pedri, Hélène Perrin
We analyze the excitation spectrum of a superfluid Bose-Einstein condensate rotating in a ring trap. We identify two important branches of the spectrum related to external and internal surface modes that lead to the instability of the superfluid. Depending on the initial circulation of the annular condensate, either the external or the internal modes become first unstable. This instability is crucially related to the superfluid nature of the rotating gas. In particular we point out the existence of a maximal circulation above which the superflow decays spontaneously, which cannot be explained by invoking the average speed of sound.
View original: http://arxiv.org/abs/1204.6183

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