Subsonic critical velocity at finite temperature

Details Subsonic critical velocity at finite temperature Subsonic critical velocity at finite temperature

2005-10-06

arxiv.org/abs/cond-mat/0510134v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures

Scientific paper

Based on the dielectric formalism in the generalised random phase approximation, we generalise the description of a Bose condensed gas to allow for a relative velocity between the superfluid and normal fluid. In this model, we determine the critical velocity dynamically as the transition point between stable and unstable dynamics. Unlike the zero temperature case, at finite temperature the relative critical velocity of a dilute Bose gas is lower than the sound velocity. This result illustrates one relevant difference that exists between a conserving and gapless approximation and other approaches.

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