Stability of a vortex in a trapped Bose-Einstein condensate
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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, characterizing the onset of metastability with respect to small transverse displacements of the vortex from the central axis. © 2000 American Physical Society.
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Svidzinsky, A. A., & Fetter, A. L.
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Svidzinsky, AA||Fetter, AL
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