title: Pulsating and persistent vector solitons in a Bose-Einstein condensate in a lattice upon phase separation instability.
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 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.
authors.affiliation: Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA.
authors.forename: Uttam
authors.initials: U
authors.lastname: Shrestha
authors.forename: Juha
authors.initials: J
authors.lastname: Javanainen
authors.forename: Janne
authors.initials: J
authors.lastname: Ruostekoski