Solutions of Gross-Pitaevskii equations beyond the hydrodynamic approximation: Application to the vortex problem

Details Solutions of Gross-Pitaevskii equations beyond the hydrodynamic approximation: Application to the vortex problem Solutions of Gross-Pitaevskii equations beyond the hydrodynamic approximation: Application to the vortex problem

2000-08-11

arxiv.org/abs/cond-mat/0008180v1

Physics

Condensed Matter

Statistical Mechanics

To appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.62.033610

We develop the multiscale technique to describe excitations of a Bose-Einstein condensate (BEC) whose characteristic scales are comparable with the healing length, thus going beyond the conventional hydrodynamical approximation. As an application of the theory we derive approximate explicit vortex and other solutions. The dynamical stability of the vortex is discussed on the basis of the mathematical framework developed here, the result being that its stability is granted at least up to times of the order of seconds, which is the condensate lifetime. Our analytical results are confirmed by the numerical simulations.

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