Binary Mixtures of Bose-Einstein Condensates: Phase dynamics and Spatial Dynamics

Details Binary Mixtures of Bose-Einstein Condensates: Phase dynamics and Spatial Dynamics Binary Mixtures of Bose-Einstein Condensates: Phase dynamics and Spatial Dynamics

1999-04-23

arxiv.org/abs/cond-mat/9904353v2

Eur. Phys. J. D 8, 319 (2000).

Physics

Condensed Matter

19 pages, 3 figures, final version of the paper

Scientific paper

10.1007/s100530050042

We investigate the relative phase coherence properties and the occurrence of demixing instabilities for two mutually interacting and time evolving Bose-Einstein condensates in traps. Our treatment naturally includes the additional decoherence effect due to fluctuations in the total number of particles. Analytical results are presented for the breathe-together solution, an extension of previously known scaling solution to the case of a binary mixture of condensates. When the three coupling constants describing the elastic interactions among the atoms in the two states are close to each other, a dramatic increase of the phase coherence time is predicted. Numerical results are presented for the parameters of the recent JILA experiments.

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