Dynamical instabilities of Bose-Einstein condensates at the band edge in one-dimensional optical lattices

Ferris, Andrew J., Davis, Matthew J., Geursen, Reece W., Blakie, P. Blair and Wilson, Andrew C. (2008) Dynamical instabilities of Bose-Einstein condensates at the band edge in one-dimensional optical lattices. Physical Review A, 77 1: . doi:10.1103/PhysRevA.77.012712

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Author Ferris, Andrew J.
Davis, Matthew J.
Geursen, Reece W.
Blakie, P. Blair
Wilson, Andrew C.
Title Dynamical instabilities of Bose-Einstein condensates at the band edge in one-dimensional optical lattices
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2008-01-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.77.012712
Open Access Status File (Publisher version)
Volume 77
Issue 1
Total pages 15
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2009
Language eng
Abstract We present a joint theoretical and experimental study of the dynamical instability of a Bose—Einstein condensate at the band edge of a one-dimensional optical lattice. The instability manifests as rapid depletion of the condensate and conversion to a thermal cloud. We consider the collisional processes that can occur in such a system, and undertake a thorough theoretical study of the dynamical instability in systems of different dimensionality. We find spontaneous scattering is an important part of this process, and thus the Gross-Pitaevskii equation is unable to accurately predict the dynamics in this system. Our beyond mean-field approach, known as the truncated Wigner method, allows us to make quantitative predictions for the processes of parametric growth and heating that are observed in the laboratory, and we find good agreement with the experimental results.
Keyword Bose-Einstein condensation
Optical lattices
Wigner distribution
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
 
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Created: Tue, 14 Apr 2009, 22:01:27 EST by Stephanie Golding on behalf of ARC Centre of Excellence for Quantum-Atom Optics