Parametric excitation of a Bose-Einstein condensate in a one-dimensional optical lattice
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 gasesDOI: 10.1103/PhysRevA.71.061602Citations: 55data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-06-19References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here