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

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

2007-11-29

arxiv.org/abs/0711.4635v2

Phys. Rev. A 78, 033619 (2008)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 12 figures

Scientific paper

10.1103/PhysRevA.78.033619

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.

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