paper

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

arXiv:cond-mat/9904353 · doi:10.1007/s100530050042

Abstract

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.

19 pages, 3 figures, final version of the paper

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