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.
Observation of dynamical instability for a Bose-Einstein condensate in a moving 1D optical lattice / L. FALLANI; L. DE SARLO; J. LYE; M. MODUGNO; R. SAERS; C. FORT; M. INGUSCIO. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 93:(2004), pp. 140406-140406. [10.1103/PhysRevLett.93.140406]
Observation of dynamical instability for a Bose-Einstein condensate in a moving 1D optical lattice
FALLANI, LEONARDO;MODUGNO, MICHELE;FORT, CHIARA;INGUSCIO, MASSIMO
2004
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.File | Dimensione | Formato | |
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