Fermion-mediated interactions in a dilute Bose-Einstein condensate

被引：23

作者：

Santamore, D. H. ^{[1
,2
]}

Timmermans, Eddy ^{[3
]}

机构：

[1] Los Alamos Natl Lab, Div Theoret, T 4, Los Alamos, NM 87545 USA

[2] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

[3] Los Alamos Natl Lab, Div Theoret, T CNLS, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW A | 2008年 / 78卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.78.013619

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：12

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