Metastability of persistent currents in trapped gases of atoms

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Karkkainen, K.
Christensson, J.
Reinisch, G.
Kavoulakis, G. M.
Reimann, S. M.
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Abstract
Description
We examine the conditions that give rise to metastable, persistent currents in a trapped Bose-Einstein condensate. A necessary condition for the stability of persistent currents is that the trapping potential is not a monotonically increasing function of the distance from the trap center. Persistent currents also require that the interatomic interactions are sufficiently strong and repulsive. Finally, any off-center vortex state is shown to be unstable, while a driven gas shows hysteresis.
Comment: 7 pages, RevTex, 5 figures
Keywords
Condensed Matter - Other Condensed Matter
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