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Conference on Lasers and Electro-Optics

Phase Separation in a two-Species Atomic Bose-Einstein Condensate with an Interspecies Feshbach Resonance

Lu Zhou, Jing Qian, Han Pu, Weiping Zhang, Hong Yuan Ling

Published Jan 1, 2009• 2 citations
Publisher

Abstract

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.
DOI
10.1364/cleo.2009.jthe100

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We consider a mixture of two-species atomic Bose-Einstein condensates coupled to a bound molecular state at zero temperature via an interspecies Feshbach resonance. The interspecies Feshbach coupling precludes the possibility of doubly mixed phases while enables not only the pure molecular superfluid but also the pure atomic superfluids to exist as distinct phases. We show that this system is able to support a rich set of phase separations, including that between two distinct mixed atom-molecule phases. We pay particular attention to the effects of the Feschbach coupling and the particle collisions on the miscibility of this multicomponent condensate system.
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We produce Bose-Einstein condensates of two different species, 87Rb and 41K, in an optical dipole trap in proximity of interspecies Feshbach resonances. We discover and characterize two Feshbach resonances, located around 35 and 79 G, by observing the three-body losses and the elastic cross section. The narrower resonance is exploited to create a double species condensate with tunable interactions. Our system opens the way to the exploration of double species Mott insulators and, more in general, of the quantum phase diagram of the two-species Bose-Hubbard model.
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