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Lookup NU author(s): Dr Brian Jackson
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We consider a Bose-Einstein condensate confined in a "Mexican hat" or sombrero 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.
Author(s): Cozzini M, Jackson B, Stringari S
Publication type: Article
Publication status: Published
Journal: Physical Review A
Year: 2006
Volume: 73
Issue: 1
ISSN (print): 1050-2947
ISSN (electronic): 1094-1622
Publisher: American Physical Society
URL: http://dx.doi.org/10.1103/PhysRevA.73.013603
DOI: 10.1103/PhysRevA.73.013603
Notes: Article no. 013603 10 pages
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