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Title: The fate of Bose-Einstein Condensate in the Presence of Spin-orbit Coupling
Originating Office: IAS
Speaker: Zhou, Qi
Issue Date: 16-Dec-2012
Event Date: 16-Dec-2012
Group/Series/Folder: Record Group 8.15 - Institute for Advanced Study
Series 3 - Audio-visual Materials
Location: 8.15:3 box 1.8
Notes: IAS Asia Pacific Workshop on Condensed Matter Physics. Talk no. 30
Title from title slide.
Host: Institute for Advanced Study.
Sponsor: The Collaborative Research Fund (CRF), The Research Grants Council (RGC).
Abstract: The recent realization of synthetic gauge fields for ultra cold atoms provides physicists exciting opportunities to investigate the interplay between two fundamental phenomena in nature, Bose-Einstein condensation and spin-orbit coupling. In this talk, the speaker will discuss a novel effect of spin-orbit coupling in bosonic systems, namely, it can destroy a high-dimensional condensate even at sufficiently low temperatures. This effect will be first demonstrated using simple examples of non-interacting bosons, which highlight the underlying physics that spin-orbit coupling qualitatively changes the single-particle Density of States at low energies. The speaker will then turn to interacting systems, where a condensate is stabilized by interaction at zero temperature. On the other hand, condensate depletion is significantly enhanced by spin-orbit coupling. Particularly, thermal depletion becomes divergent when spin-orbit coupling becomes isotropic and interaction is spin-independent. This leads to the disappearance of a three-dimensional condensate at any finite temperature, and suggests an interesting routine to suppress the long-range order in weakly interacting atomic systems via spin-orbit coupling.
Duration: 36 min.
Appears in Series:8.15:3 - Audio-visual Materials
Videos for Public -- Distinguished Lectures