Phase Coherence and Superfluid-Insulator Transition in a Disordered Bose-Einstein Condensate
arXiv:0710.5187 · doi:10.1103/PhysRevA.77.033632
Abstract
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.
4 pages, 5 figures, distortions in figures 1 and 4 have been fixed in version 3. This paper has been accepted to PRA
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- Disorder-induced trapping versus Anderson localization in Bose-Einstein condensates expanding in disordered potentials
- Density modulations in an elongated Bose-Einstein condensate released from a disordered potential
- Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials
- Dipole Oscillations of a Bose-Einstein Condensate in Presence of Defects and Disorder
- Superfluid to Bose-glass transition in a 1D weakly interacting Bose gas
- Anderson localization of a weakly interacting one dimensional Bose gas
- Localized states and interaction induced delocalization in Bose gases with quenched disorder
- Damped Bloch Oscillations of Bose-Einstein Condensates in Disordered Potential Gradients
- Lattice modulation spectroscopy of strongly interacting bosons in disordered and quasi-periodic optical lattices
- Incoherence of Bose-Einstein condensates at supersonic speeds due to quantum noise
- Caustic formation in expanding condensates of cold atoms
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- Effect of disorder on the interacting Fermi gases in a one-dimensional optical lattice