Journal
EUROPHYSICS LETTERS
Volume 72, Issue 5, Pages 698-704Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2005-10295-7
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We predict new generic types of vorticity-carrying soliton complexes in a class of physical systems including an attractive Bose-Einstein condensate in a square optical lattice (OL) and photonic lattices in photorefractive media. The patterns include ring-shaped higher-order vortex solitons and supervortices. Stability diagrams for these patterns, based on direct simulations, are presented. The vortex ring solitons are stable if the phase difference Delta phi between adjacent solitons in the ring is larger than pi/2, while the supervortices are stable in the opposite case, Delta phi
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