Mean-Field Dynamics of a Two-Mode Bose-Einstein Condensate Subject to Decoherence

We discuss the dynamics of Bose-Einstein condensates in a double-well potential subject to decoherence (or particle loss). Starting from the full many-body dynamics described by the master equation, an effective Gross-Pitaevskii-like equation is derived in the mean-field approximation. By numericall...

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Bibliographic Details
Published in:Chinese physics letters 2010-07, Vol.27 (7), p.070303-070303
Main Authors: Bo, Cui, Song-Lin, Wu, Xue-Xi, Yi
Format: Article
Language:English
Subjects:
Approximation
Bose-Einstein condensates
Dynamics
Mathematical analysis
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Summary:We discuss the dynamics of Bose-Einstein condensates in a double-well potential subject to decoherence (or particle loss). Starting from the full many-body dynamics described by the master equation, an effective Gross-Pitaevskii-like equation is derived in the mean-field approximation. By numerically solving the GP equation, we find that macroscopic quantum self-trapping disappears for strong decoherence, while generalized self-trapping occurs under weak decoherence. The fixed points have been calculated, and we find that an abrupt change from elliptic to an attractor and a repeller occurs, reflecting the metastable behavior of the system around these points.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/27/7/070303