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Published July 25, 2008 | Published
Journal Article Open

Tunable Miscibility in a Dual-Species Bose-Einstein Condensate

Abstract

We report on the observation of controllable phase separation in a dual-species Bose-Einstein condensate with 85Rb and 87Rb. Interatomic interactions between the different components determine the miscibility of the two quantum fluids. In our experiments, we can clearly observe immiscible behavior via a dramatic spatial separation of the two species. Furthermore, a magnetic-field Feshbach resonance is used to change them between miscible and immiscible by tuning the 85Rb scattering length. The spatial density pattern of the immiscible quantum fluids exhibits complex alternating-domain structures that are uncharacteristic of its stationary ground state.

Additional Information

©2008 The American Physical Society. (Received 19 February 2008; published 24 July 2008) We gratefully acknowledge useful discussions with Shai Ronen, Mark Edwards, Deborah Jin, and Eric Cornell. This work has been supported by NSF and ONR.

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