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Journal Article

Bifurcations, stability and mode evolution in segregated quasi-2D condensate mixtures


Roy,  Arko
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Pal, S., Roy, A., & Angom, D. (2017). Bifurcations, stability and mode evolution in segregated quasi-2D condensate mixtures. Journal of Physics B, 50(19): 195301. doi:10.1088/1361-6455/aa889f.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002E-2CC2-D
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.