Non-diffusive phase spreading of a Bose-Einstein condensate at finite temperature

Details Non-diffusive phase spreading of a Bose-Einstein condensate at finite temperature Non-diffusive phase spreading of a Bose-Einstein condensate at finite temperature

2006-10-23

arxiv.org/abs/cond-mat/0610644v3

Physical Review A 75 (26/03/2007) 0033616

Physics

Condensed Matter

Other Condensed Matter

16 pages, 7 figures

Scientific paper

10.1103/PhysRevA.75.033616

We show that the phase of a condensate in a finite temperature gas spreads linearly in time at long times rather than in a diffusive way. This result is supported by classical field simulations, and analytical calculations which are generalized to the quantum case under the assumption of quantum ergodicity in the system. This super-diffusive behavior is intimately related to conservation of energy during the free evolution of the system and to fluctuations of energy in the prepared initial state.

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