Physics – Condensed Matter – Superconductivity
Scientific paper
2007-12-20
Phys. Rev. A 78, 013607 (2008)
Physics
Condensed Matter
Superconductivity
12 pages with 6 figures. Extended version of arXiv:cond-mat/0612496
Scientific paper
10.1103/PhysRevA.78.013607
The ground state phase diagram of Fermi-Fermi mixtures in optical lattices is analyzed as a function of interaction strength, population imbalance, filling fraction and tunneling parameters. It is shown that population imbalanced Fermi-Fermi mixtures reduce to strongly interacting Bose-Fermi mixtures in the molecular limit, in sharp contrast to homogeneous or harmonically trapped systems where the resulting Bose-Fermi mixture is weakly interacting. Furthermore, insulating phases are found in optical lattices of Fermi-Fermi mixtures in addition to the standard phase-separated or coexisting superfluid/excess fermion phases found in homogeneous systems. The insulating states can be a molecular Bose-Mott insulator (BMI), a Fermi-Pauli insulator (FPI), a phase-separated BMI/FPI mixture or a Bose-Fermi checkerboard (BFC).
de Melo Carlos A. R. Sa
Iskin M.
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