Azimuthal vortex clusters in Bose-Einstein condensates
V. M. Lashkin, A. S. Desyatnikov, E. A. Ostrovskaya, and Yu. S. Kivshar,
Phys. Rev. A 85, 013620-6 (2012).
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Abstract: We describe, analytically and numerically, topologically nontrivial stationary states with azimuthal modulation of density in a repulsive Bose-Einstein condensate (BEC) confined in a harmonic trap. We show that, depending on the number of density peaks and total topological charge, these states can have a sophisticated phase texture associated with a vortex cluster. For a given topological charge, the form of density distribution and the structure of phase singularities are uniquely linked, thus simultaneous phase and density modulation enforces the formation of a vortex cluster both in rotating and in nonrotating BEC clouds.
Keywords: multivortex solitons; vortices; lattices; traps; media
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