Parametric excitation of a Bose-Einstein condensate in a 1D optical lattice

Preprint

25 May 2005

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0410122

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 Stoeferle et al., Phys. Rev. Lett. 92, 130403 (2004).

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Version 1, 2004-10-05, ArXiv
Version 2, 2004-10-25, ArXiv
Version 3, 2005-05-25, ArXiv
Published version: Physical Review A, 71 (6), 061602.

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