Observation of dynamical instability for a Bose-Einstein condensate in a moving 1D optical lattice |
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| Authors: | Fallani L De Sarlo L Lye J E Modugno M Saers R Fort C Inguscio M |
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| Institution: | LENS, Dipartimento di Fisica, and INFM, Università di Firenze, via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy. fallani@lens.unifi.it |
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| Abstract: | 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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