Vortex signatures in annular Bose-Einstein condensates

Details Vortex signatures in annular Bose-Einstein condensates Vortex signatures in annular Bose-Einstein condensates

2005-10-06

arxiv.org/abs/cond-mat/0510143v1

Physics

Condensed Matter

Other Condensed Matter

11 pages, 7 figures

Scientific paper

10.1103/PhysRevA.73.013603

We consider a Bose-Einstein condensate confined in a ``Mexican hat'' potential, with a quartic minus quadratic radial dependence. We find conditions under which the ground state is annular in shape, with a hole in the center of the condensate. Rotation leads to the appearance of stable multiply-quantized vortices, giving rise to a superfluid flow around the ring. The collective modes of the system are explored both numerically and analytically using the Gross-Pitaevskii and hydrodynamic equations. Potential experimental schemes to detect vorticity are proposed and evaluated, which include measuring the splitting of collective mode frequencies, observing expansion following release from the trap, and probing the momentum distribution of the condensate.

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