Vortex state structure of a Bose condensate in an asymmetric trap

Based on an analytic solution of the Gross-Pitaevskii equation in the large -condensate (Thomas-Fermi) limit we determine the structure of a stationary vortex in a Bose-Einstein condensate in a nonaxisymmetric rotating trap. T he condensate velocity field has cylindrical symmetry only near the Vortex core and becomes intrinsically anisotropic near the condensate boundaries. Rotating the anisotropic trap induces an additional irrotational velocity f ield even for a vortex-free condensate. (C) 2000 Elsevier Science B.V. All rights reserved.