Observation of dynamical instability for a Bose-Einstein condensate in a moving 1D optical lattice

Details Observation of dynamical instability for a Bose-Einstein condensate in a moving 1D optical lattice Observation of dynamical instability for a Bose-Einstein condensate in a moving 1D optical lattice

2004-04-02

arxiv.org/abs/cond-mat/0404045v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.93.140406

We have experimentally studied the unstable dynamics of a harmonically trapped Bose-Einstein condensate loaded into a 1D moving optical lattice. The lifetime of the condensate in such a potential exhibits a dramatic dependence on the quasimomentum state. This is unambiguously attributed to the onset of dynamical instability, after a comparison with the predictions of the Gross-Pitaevskii theory. Deeply in the unstable region we observe the rapid appearance of complex structures in the atomic density profile, as a consequence of the condensate phase uniformity breakdown.

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