Physics – Atomic Physics
Scientific paper
2008-11-20
Phys. Rev. Lett. 102, 130604 (2009)
Physics
Atomic Physics
4 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.102.130604
A Bose-Einstein condensate in an oscillating spatially asymmetric potential is shown to exhibit a directed current for unbiased initial conditions despite time symmetry. This phenomenon occurs only if the interaction between atoms, treated in mean-field approximation, exceeds a critical value. Our findings can be described with a three-mode model (TMM). These TMM results corroborate well with a many-body study over a time scale which increases with increasing atom number. The duration of this time scale probes the validity of the used mean-field approximation.
Benenti Giuliano
Casati Giulio
Hänggi Peter
Li Baowen
Poletti Dario
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