We study the condensed phase of a Bose-Fermi mixture with a tunable pairing interaction between bosons and fermions with many-body diagrammatic methods and fixed-node diffusion quantum Monte Carlo simulations. A universal behavior of the condensate fraction and bosonic momentum distribution with respect to the boson concentration is found to hold in an extended range of boson-fermion couplings and concentrations. For vanishing boson density, we prove that the bosonic condensate fraction reduces to the quasiparticle weight Z of the Fermi polaron studied in the context of polarized Fermi gases, unifying in this way two apparently unrelated quantities.
Condensed phase of Bose-Fermi mixtures with a pairing interaction / A. Guidini, G. Bertaina, D.E. Galli, P. Pieri. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 91:2(2015 Feb 03), pp. 023603.1-023603.5. [10.1103/PhysRevA.91.023603]
Condensed phase of Bose-Fermi mixtures with a pairing interaction
G. BertainaSecondo
;D.E. GalliPenultimo
;
2015
Abstract
We study the condensed phase of a Bose-Fermi mixture with a tunable pairing interaction between bosons and fermions with many-body diagrammatic methods and fixed-node diffusion quantum Monte Carlo simulations. A universal behavior of the condensate fraction and bosonic momentum distribution with respect to the boson concentration is found to hold in an extended range of boson-fermion couplings and concentrations. For vanishing boson density, we prove that the bosonic condensate fraction reduces to the quasiparticle weight Z of the Fermi polaron studied in the context of polarized Fermi gases, unifying in this way two apparently unrelated quantities.File | Dimensione | Formato | |
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