Exploration of the Exact Bose-Fermi Mixture Phase Diagram via Quantum Monte Carlo

Gianluca Bertaina, Elisa Fratini, P. Pieri +1 more

Gianluca Bertaina, Andrea Guidini, P. Pieri

晶子 正木

Arata Yamamoto

Bose-Fermi mixtures have been recently realized and invesitigated in ultracold atomic experiments. We formulate quantum Monte Carlo simulation of Bose-Fermi mixtures on the (3+1)-dimensional lattice. As its first application, we analyze the boson-fermion pair correlation and the phase diagram of the Bose-Einstein condensation.

Eric Duchon, Shizhong Zhang, S.-L. Chang +2 more

Gianluca Bertaina, Elisa Fratini, S. Giorgini +1 more

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).