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  • Title: Stability of a vortex in a trapped Bose-Einstein condensate.
    Author: Svidzinsky AA, Fetter AL.
    Journal: Phys Rev Lett; 2000 Jun 26; 84(26 Pt 1):5919-23. PubMed ID: 10991089.
    Abstract:
    Based on the method of matched asymptotic expansions and on a time-dependent variational analysis, we study the dynamics of a vortex in a three-dimensional disk-shaped nonaxisymmetric condensate in the Thomas-Fermi limit. Both methods show that a vortex in a trapped Bose-Einstein condensate has formally unstable normal mode(s) with positive normalization and negative frequency, corresponding to a precession of the vortex line around the center of the trap. In a rotating trap, the solution becomes stable above an angular velocity Omega(m), characterizing the onset of metastability with respect to small transverse displacements of the vortex from the central axis.
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