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Vortex stabilization in a small rotating asymmetric Bose-Einstein condensate | Marion Linn
; Matthias Niemeyer
; Alexander L. Fetter
; | Date: |
23 Mar 2001 | Subject: | cond-mat | Abstract: | We use a variational method to investigate the ground-state phase diagram of a small, asymmetric Bose-Einstein condensate with respect to the dimensionless interparticle interaction strength $gamma$ and the applied external rotation speed $Omega$. For a given $gamma$, the transition lines between no-vortex and vortex states are shifted toward higher $Omega$ relative to those for the symmetric case. We also find a re-entrant behavior, where the number of vortex cores can decrease for large $Omega$. In addition, stabilizing a vortex in a rotating asymmetric trap requires a minimum interaction strength. For a given asymmetry, the evolution of the variational parameters with increasing $Omega$ shows two different types of transitions (sharp or continuous), depending on the strength of the interaction. We also investigate transitions to states with higher vorticity; the corresponding angular momentum increases continuously as a function of $Omega$. | Source: | arXiv, cond-mat/0103489 | Services: | Forum | Review | PDF | Favorites |
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