Phase separation of Bose-Einstein condensates

Details Phase separation of Bose-Einstein condensates Phase separation of Bose-Einstein condensates

1997-09-26

arxiv.org/abs/cond-mat/9709301v2

Physics

Condensed Matter

11 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.81.5718

The zero-temperature system of two dilute overlapping Bose-Einstein condensates is unstable against long wavelength excitations if the interaction strength between the distinguishable bosons exceeds the geometric mean of the like-boson interaction strengths. If the condensates attract each other, the instability is similar to the instability of the negative scattering length condensates. If the condensates repel, they separate spatially into condensates of equal pressure. We estimate the boundary size, surface tension and energy of the phase separated condensate system and we discuss the implications for double condensates in atomic traps.

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