Monday, March 19, 2012

1203.3657 (D. Witthaut et al.)

Beyond mean-field dynamics in open Bose-Hubbard chains    [PDF]

D. Witthaut, F. Trimborn, H. Hennig, G. Kordas, T. Geisel, S. Wimberger
We investigate the effects of phase noise and particle loss on the dynamics of a Bose-Einstein condensate in an optical lattice. Starting from the many-body master equation, we discuss the applicability of generalized mean-field approximations in the presence of dissipation as well as methods to simulate quantum effects beyond mean-field by including higher-order correlation functions. It is shown that localized particle dissipation leads to surprising dynamics, as it can suppress decay and restore the coherence of a Bose-Einstein condensate. These effects can be applied to engineer coherent structures such as stable discrete breathers and dark solitons.
View original: http://arxiv.org/abs/1203.3657

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