Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-06-19
Physics
Condensed Matter
Other Condensed Matter
v2: Added several references
Scientific paper
10.1103/PhysRevA.77.012712
We report on experiments that demonstrate dynamical instability in 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 perform numerical modeling of the experiments using both a mean-field and beyond mean-field approach. We compare our numerical results to the experimental data, and find that the Gross-Pitaevskii equation is not able to describe this experiment. Our beyond mean-field approach, known as the truncated Wigner method, allows us to make quantitative predictions for the processes of parametric growth and thermalization that are observed in the laboratory, and we find good agreement with the experimental results.
Blakie Blair P.
Davis Matthew J.
Ferris Andrew J.
Geursen Reece W.
Wilson Andrew C.
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