Pulsating and persistent vector solitons in a Bose-Einstein condensate in a lattice upon phase separation instability
arXiv:0903.5016 · doi:10.1103/PhysRevLett.103.190401
Abstract
We study numerically the outcome of the phase separation instability of a dual-species Bose-Einstein condensate in an optical lattice. When only one excitation mode is unstable a bound pair of a bright and dark soliton-like structures periodically appears and disappears, whereas for more than one unstable mode a persistent soliton-antisoliton pair develops. The oscillating soliton represents a regime where the two-species condensate neither remains phase-separated nor is dynamically stable.
submitted to PRL
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