Vortex line and ring dynamics in trapped Bose-Einstein condensates

Details Vortex line and ring dynamics in trapped Bose-Einstein condensates Vortex line and ring dynamics in trapped Bose-Einstein condensates

1999-07-21

arxiv.org/abs/cond-mat/9907325v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 7 figures, ReVTex

Scientific paper

10.1103/PhysRevA.61.013604

Vortex dynamics in inhomogeneous Bose-Einstein condensates are studied numerically in two and three dimensions. We simulate the precession of a single vortex around the center of a trapped condensate, and use the Magnus force to estimate the precession frequency. Vortex ring dynamics in a spherical trap are also simulated, and we discover that a ring undergoes oscillatory motion around a circle of maximum energy. The position of this locus is calculated as a function of the number of condensed atoms. In the presence of dissipation, the amplitude of the oscillation will increase, eventually resulting in self-annihilation of the ring.

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