Ground-state properties of a dilute Bose-Fermi mixture

Abstract

We investigate the properties of a dilute boson-fermion mixture at zero temperature. The ground-state energy of the system is calculated to second order in the Bose-Fermi coupling constant. The Green's function formalism is applied to obtain results for the effect of Bose-Fermi interactions on the spectrum of phonon excitations, the momentum distribution, the condensate fraction and the superfluid density of the bosonic component. A quantitative discussion of these effects is presented in the case of mixtures with attractive interspecies interaction.

10 pages, 10 figures

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• Fermi-Bose quantum degenerate ^40 K - ^87 Rb mixture with attractive interaction
• Structure and stability of trapped atomic boson-fermion mixtures
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