Parametric excitation of a Bose-Einstein condensate in a 1D optical lattice
Other Condensed Matter
2009-11-10 v3
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).
Cite
@article{arxiv.cond-mat/0410122,
title = {Parametric excitation of a Bose-Einstein condensate in a 1D optical lattice},
author = {M. Kraemer and C. Tozzo and F. Dalfovo},
journal= {arXiv preprint arXiv:cond-mat/0410122},
year = {2009}
}
Comments
4 pages, 4 figures, more results added, to appear in PRA Rapid Communications