Parametric excitation of a Bose-Einstein condensate in a one-dimensional optical lattice

Year: 2005

Authors: Kraemer M., Tozzo C., Dalfovo F.

Autors Affiliation: INFM-BEC;
Dipartimento di Fisica, Universita’ di Trento

Abstract: We study the response of a Bose-Einstein condensate to a periodic modulation of the depth of an optical lattice. Using Gross-Pitaevskii theory, we show that a modulation at frequency Omega drives the parametric excitation of Bogoliubov modes with frequency Omega/2. The ensuing nonlinear dynamics leads to a rapid broadening of the momentum distribution and a consequent large increase of the condensate size after free expansion. We show that this process does not require the presence of a large condensate depletion. Our results reproduce the main features of the spectrum measured in the superfluid phase by Stoferle et al. [Phys. Rev. Lett. 92, 130403 (2004)].

Journal/Review: PHYSICAL REVIEW A

Volume: 71 (6)      Pages from: 061602-1  to: 061602-4

KeyWords: Ultracold gases
DOI: 10.1103/PhysRevA.71.061602

Citations: 55
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