Superfluid and Mott Insulator phases of one-dimensional Bose-Fermi mixtures

Zujev, A.; Baldwin, A.; Scalettar, R. T.; Rousseau, V. G.; Denteneer, P. J. H.; Rigol, M.

Superfluid and Mott Insulator phases of one-dimensional Bose-Fermi mixtures

Authors

Description

We study the ground state phases of Bose-Fermi mixtures in one-dimensional optical lattices with quantum Monte Carlo simulations using the Canonical Worm algorithm. Depending on the filling of bosons and fermions, and the on-site intra- and inter-species interaction, different kinds of incompressible and superfluid phases appear. On the compressible side, correlations between bosons and fermions can lead to a distinctive behavior of the bosonic superfluid density and the fermionic stiffness, as well as of the equal-time Green functions, which allow one to identify regions where the two species exhibit anticorrelated flow. We present here complete phase diagrams for these systems at different fillings and as a function of the interaction parameters.
8 pages, 12 figures