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

Alice Sinatra·Yvan Castin
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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.

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Alice Sinatra, Yvan Castin. 1999-10-26. Binary Mixtures of Bose-Einstein Condensates: Phase dynamics and Spatial Dynamics. https://doi.org/10.1007/s100530050042

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