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arXiv · 0806.2077

Vortex dynamics in trapped Bose-Einstein condensate

E. J. M. Madarassy·C. F. Barenghi
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Abstract

We perform numerical simulations of vortex motion in a trapped Bose-Einstein condensate by solving the two-dimensional Gross-Pitaevskii Equation in the presence of a simple phenomenological model of interaction between the condensate and the finite temperature thermal cloud. At zero temperature, the trajectories of a single, off - centred vortex precessing in the condensate, and of a vortex - antivortex pair orbiting within the trap, excite acoustic emission. At finite temperatures the vortices move to the edge of the condensate and vanish. By fitting the finite -temperature trajectories, we relate the phenomenological damping parameter to the friction coefficients $α$ and $α^{'}$, which are used to describe the interaction between quantised vortices and the normal fluid in superfluid helium.

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E. J. M. Madarassy, C. F. Barenghi. 2008-06-17. Vortex dynamics in trapped Bose-Einstein condensate. https://doi.org/10.1007/s10909-008-9811-9

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