Bose systems in spatially random or time-varying potentials

Details Bose systems in spatially random or time-varying potentials Bose systems in spatially random or time-varying potentials

2009-04-06

arxiv.org/abs/0904.0749v1

Laser Phys. 19 (2009) 686-699

Physics

Condensed Matter

Disordered Systems and Neural Networks

latex file, 26 pages, 1 figure

Scientific paper

Bose systems, subject to the action of external random potentials, are considered. For describing the system properties, under the action of spatially random potentials of arbitrary strength, the stochastic mean-field approximation is employed. When the strength of disorder increases, the extended Bose-Einstein condensate fragments into spatially disconnected regions, forming a granular condensate. Increasing the strength of disorder even more transforms the granular condensate into the normal glass. The influence of time-dependent external potentials is also discussed. Fast varying temporal potentials, to some extent, imitate the action of spatially random potentials. In particular, strong time-alternating potential can induce the appearance of a nonequilibrium granular condensate.

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