Phase Coherence and Superfluid-Insulator Transition in a Disordered Bose-Einstein Condensate

Details Phase Coherence and Superfluid-Insulator Transition in a Disordered Bose-Einstein Condensate Phase Coherence and Superfluid-Insulator Transition in a Disordered Bose-Einstein Condensate

2007-10-26

arxiv.org/abs/0710.5187v3

Physics

Condensed Matter

Other Condensed Matter

4 pages, 5 figures, distortions in figures 1 and 4 have been fixed in version 3. This paper has been accepted to PRA

Scientific paper

10.1103/PhysRevA.77.033632

We have studied the effects of a disordered optical potential on the transport and phase coherence of a Bose-Einstein condensate (BEC) of 7Li atoms. At moderate disorder strengths (V_D), we observe inhibited transport and damping of dipole excitations, while in time-of-flight images, random but reproducible interference patterns are observed. In-situ images reveal that the appearance of interference is correlated with density modulation, without complete fragmentation. At higher V_D, the interference contrast diminishes as the BEC fragments into multiple pieces with little phase coherence.

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