Fermion-mediated interactions in a dilute Bose-Einstein condensate

Details Fermion-mediated interactions in a dilute Bose-Einstein condensate Fermion-mediated interactions in a dilute Bose-Einstein condensate

2008-06-03

arxiv.org/abs/0806.0598v2

Phys. Rev. A 78, 013619 (2008)

Physics

Condensed Matter

Statistical Mechanics

16 pages, 6 figures, typo corrected

Scientific paper

10.1103/PhysRevA.78.013619

We develop a diagrammatic perturbation treatment to calculate the zero-temperature equation of state of the dilute gas mixture of a single spin component Bose-Einstein condensate (BEC) and a normal Fermi gas of indistinguishable (single spin) fermion particles. We find that the mean-field description breaks down near the mechanical instability related to the phase separation phenomenon. Our analysis shows that the instability is caused by the competition of the usual short-range and fermion-mediated boson-boson interactions, which result in a boson compressibility that diverges. In the low BEC-density limit, we show that the diagrammatic analysis simplifies, we sum part of the higher order diagrams, and we discuss the effects of other higher-order contributions.

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