We construct exact solutions of the Gross-Pitaevskii equation for solitary vortices, and approximate ones for fundamental solitons, in two-dimensional models of Bose-Einstein condensates with a spatially modulated nonlinearity of either sign and a harmonic trapping potential. The number of vortex-soliton (VS) modes is determined by the discrete energy spectrum of a related linear Schrödinger equation. The VS families in the system with the attractive and repulsive nonlinearity are mutually complementary. Stable VSs with vorticity S≥2 and those corresponding to higher-order radial states are reported, in the case of the attraction and repulsion, respectively.
|Physical Review A - Atomic, Molecular, and Optical Physics
|Published - 28 Jun 2010