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[en] We study the evolution inside a harmonic trap of Bose-Einstein condensates released from the periodic potential of an optical lattice. After a time-of-flight, harmonic motion of the interference peaks is observed as well as a breathing motion in the direction perpendicular to the optical lattice. We interpret these results in terms of a simple physical model and discuss the possibility of more detailed studies of such a system
Journal
Journal of Optics. B, Quantum and Semiclassical Optics (Print); ISSN 1464-4266; 
; v. 5(2); p. S38-S41
; v. 5(2); p. S38-S41