Pulsating and persistent vector solitons in a Bose-Einstein condensate in a lattice upon phase separation instability.
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 bright and dark solitonlike 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.
Shrestha
Uttam
U
Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA.
Javanainen
Juha
J
Ruostekoski
Janne
J