Critical frequency for vortex nucleation in Bose-Fermi mixtures in optical lattices
arXiv:cond-mat/0511160 · doi:10.1103/PhysRevA.72.053602
Abstract
We investigate within mean-field theory the influence of a one-dimensional optical lattice and of trapped degenerate fermions on the critical rotational frequency for vortex line creation in a Bose-Einstein condensate. We consider laser intensities of the lattice such that quantum coherence across the condensate is ensured. We find a sizable decrease of the thermodynamic critical frequency for vortex nucleation with increasing applied laser strength and suggest suitable parameters for experimental observation. Since 87Rb-40K mixtures may undergo collapse, we analyze the related question of how the optical lattice affects the mechanical stability of the system.
5 pages, 4 figures, revtex4
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