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MPIPKS:
Ultracold matter
Abstract:
We present new features of low energy Bogoliubov quasiparticle excitations of a two-component Bose-Einstein condensate (TBEC) in quasi-2D geometry at zero temperature using Hartree-Fock-Bogoliubov formalism. We, in particular, consider the TBECs of Cs-133-Rb-87 and Rb-85-Rb-87, and show specific features in the low energy excitation spectrum as a function of the interaction strength. For Rb-85-Rb-87 TBEC, the appearance of a new zero energy mode is observed. Whereas for Cs-133-Rb-87 TBEC we report a bifurcation of the slosh mode at the point of transition from miscible to immiscible domain. The lower energy mode, after the bifurcation, goes soft and becomes a new Nambu-Goldstone mode of the system.
