Instabilities of a Bose-Einstein condensate in a periodic potential: an experimental investigation

Details Instabilities of a Bose-Einstein condensate in a periodic potential: an experimental investigation Instabilities of a Bose-Einstein condensate in a periodic potential: an experimental investigation

2003-11-07

arxiv.org/abs/cond-mat/0311160v1

Physics

Condensed Matter

7 pages, 3 figures; submitted to Optics Express (Focus Issue on Cold Atomic Gases in Optical Lattices)

Scientific paper

10.1364/OPEX.12.000004

By accelerating a Bose-Einstein condensate in a controlled way across the edge of the Brillouin zone of a 1D optical lattice, we investigate the stability of the condensate in the vicinity of the zone edge. Through an analysis of the visibility of the interference pattern after a time-of-flight and the widths of the interference peaks, we characterize the onset of instability as the acceleration of the lattice is decreased. We briefly discuss the significance of our results with respect to recent theoretical work.

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