Stability of vortices in rotating taps: a 3d analysis

Details Stability of vortices in rotating taps: a 3d analysis Stability of vortices in rotating taps: a 3d analysis

1999-03-23

arxiv.org/abs/cond-mat/9903353v2

Phys. Rev. A 60, 4864 (1999)

Physics

Condensed Matter

Statistical Mechanics

10 pages, 7 figures in EPS format

Scientific paper

10.1103/PhysRevA.60.4864

We study the stability of vortex-lines in trapped dilute gases subject to rotation. We solve numerically both the Gross-Pitaevskii and the Bogoliubov equations for a 3d condensate in spherically and cilyndrically symmetric stationary traps, from small to very large nonlinearities. In the stationary case it is found that the vortex states with unit and $m=2$ charge are energetically unstable. In the rotating trap it is found that this energetic instability may only be suppressed for the $m=1$ vortex-line, and that the multicharged vortices are never a local minimum of the energy functional, which implies that the absolute minimum of the energy is not an eigenstate of the $L_z$ operator, when the angular speed is above a certain value, $\Omega > \Omega_2$.

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