title: Quantum Monte Carlo study of a resonant Bose-Fermi mixture.
abstract: We study a resonant Bose-Fermi mixture at zero temperature by using the fixed-node diffusion Monte Carlo method. We explore the system from weak to strong boson-fermion interaction, for different concentrations of the bosons relative to the fermion component. We focus on the case where the boson density n(B) is smaller than the fermion density n(F), for which a first-order quantum phase transition is found from a state with condensed bosons immersed in a Fermi sea, to a Fermi-Fermi mixture of composite fermions and unpaired fermions. We obtain the equation of state and the phase diagram, and we find that the region of phase separation shrinks to zero for vanishing n(B).
authors.affiliation: Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne EPFL, CH-1015 Lausanne, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Bertaina
authors.affiliation: School of Science and Technology, Physics Division, University of Camerino and CNISM, I-62032 Camerino, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Fratini
authors.affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Giorgini
authors.affiliation: School of Science and Technology, Physics Division, University of Camerino and CNISM, I-62032 Camerino, Italy and INFN, Sezione di Perugia, Perugia, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Pieri