We present the results of experimental work on the dynamics of a Bose-Einstein condensate (BEC) loaded in a 1D moving optical lattice. The system is studied both in the regime of low atomic density (expanding BEC) and high atomic density (trapped BEC). In the low-density regime, the stable dynamics of the system is well-described in terms of Bloch waves. In the presence of nonlinearities, as in a high-density sample, the Bloch waves are not stable solutions of the Gross-Pitaevskii equation (GPE) and dynamical instability takes place.
Dynamics of Bloch matter waves and its breakdown: a Bose-Einstein condensate in a moving 1D optical lattice / C. Fort; F. S. Cataliotti; J. Catani; L. De Sarlo; L. Fallani; J. E. Lye; M. Modugno; R. Saers; M. Inguscio. - In: LASER PHYSICS. - ISSN 1054-660X. - STAMPA. - 15:(2005), pp. 447-453.
Dynamics of Bloch matter waves and its breakdown: a Bose-Einstein condensate in a moving 1D optical lattice
FORT, CHIARA;CATALIOTTI, FRANCESCO SAVERIO;FALLANI, LEONARDO;MODUGNO, MICHELE;INGUSCIO, MASSIMO
2005
Abstract
We present the results of experimental work on the dynamics of a Bose-Einstein condensate (BEC) loaded in a 1D moving optical lattice. The system is studied both in the regime of low atomic density (expanding BEC) and high atomic density (trapped BEC). In the low-density regime, the stable dynamics of the system is well-described in terms of Bloch waves. In the presence of nonlinearities, as in a high-density sample, the Bloch waves are not stable solutions of the Gross-Pitaevskii equation (GPE) and dynamical instability takes place.
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