Phase Separation of Two-Species Bose Condensates

KL Lee, NB Jørgensen, I-Kang Liu +3 more

Soumik Bandyopadhyay, Arko Roy, D. Angom

We examine the dynamics associated with the miscibility-immiscibility transition of trapped two-species Bose-Einstein condensates (TBECs) of dilute atomic gases in the presence of vortices. In particular, we consider TBECs of Rb hyperfine states and Rb-Cs mixture. In the case of a singly charged vortex in only one of the condensates, there is enhancement when the vortex is present in the species which occupies the edges at phase separation. But suppression occurs when the vortex is in the species which occupies the core region. To examine the role of the vortex, we quench the interspecies interactions to drive the TBECs from miscible to immiscible phase, and use the time-dependent Gross-Pitaevskii equation to probe the phenomenon of phase separation. We also examine the effects of higher charged vortex to phase separation.

Lu Zhou, Jing Qian, Han Pu +2 more

We consider a mixture of two-species atomic Bose-Einstein codensates coupled to a bound molecular state at zero temperature via Feshbach resonance. This system is shown to be able to support rich sets of phase separations.

S. T. Chui, Hong Chui, Hualin Shi +2 more

E. Arimondo

Uttam Shrestha, Juha Javanainen, Janne Ruostekoski

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.