Interface Tension of Bose-Einstein Condensates

Details Interface Tension of Bose-Einstein Condensates Interface Tension of Bose-Einstein Condensates

2008-05-16

arxiv.org/abs/0805.2512v1

Phys. Rev. A 78, 023624 (2008)

Physics

Condensed Matter

Statistical Mechanics

10 pages, 4 figures

Scientific paper

10.1103/PhysRevA.78.023624

Motivated by recent observations of phase-segregated binary Bose-Einstein condensates, we propose a method to calculate the excess energy due to the interface tension of a trapped configuration. By this method one should be able to numerically reproduce the experimental data by means of a simple Thomas-Fermi approximation, combined with interface excess terms and the Laplace equation. Using the Gross-Pitaevskii theory, we find expressions for the interface excesses which are accurate in a very broad range of the interspecies and intraspecies interaction parameters. We also present finite-temperature corrections to the interface tension which, aside from the regime of weak segregation, turn out to be small.

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