Impact of anisotropy on vortex clusters and their dynamics

Details Impact of anisotropy on vortex clusters and their dynamics Impact of anisotropy on vortex clusters and their dynamics

2010-11-24

arxiv.org/abs/1011.5350v1

EPL 93, 20008 (2011)

Physics

Condensed Matter

Quantum Gases

6 pages, 6 figures

Scientific paper

10.1209/0295-5075/93/20008

We investigate the effects of anisotropy on the stability and dynamics of vortex cluster states which arise in Bose-Einstein condensates. Sufficiently strong anisotropies are shown to stabilize states with arbitrary numbers of vortices that are highly unstable in the isotropic limit. Conversely, anisotropy can be used to destabilize states which are stable in the isotropic limit. Near the linear limit, we identify the bifurcations of vortex states including their emergence from linear eigenstates, while in the strongly nonlinear limit, a particle-like description of the dynamics of the vortices in the anisotropic trap is developed. Both are in very good agreement with numerical results. Collective modes of stabilized many vortex cluster states are demonstrated.

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