Bifurcations, stability, and mode evolution in segregated condensate mixtures
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 (HFB). We, in particular, consider the TBECs of 133Cs~-87Rb and 85Rb~-87Rb, and show specific features in the low energy excitation spectrum as a function of the interaction strength. For 85Rb~-87Rb TBEC, the appearance of a new zero energy mode is observed. Whereas for 133Cs~-87Rb TBEC we report a bifurcation of the softened Kohn mode at the point of transition from miscible to immiscible domain. The lower energy mode, after the bifurcation, goes soft and becomes a new Goldstone mode of the system.
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