Vortex dynamics in trapped Bose-Einstein condensate
arXiv:0806.2077 · doi:10.1007/s10909-008-9811-9
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 and , which are used to describe the interaction between quantised vortices and the normal fluid in superfluid helium.
16 pages, 18 figures, published in JLTP
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Cited by in corpus (24)
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