Superfluid and insulating phases of fermion mixtures in optical lattices

Abstract

The ground state phase diagram of fermion mixtures in optical lattices is analyzed as a function of interaction strength, fermion filling factor and tunneling parameters. In addition to standard superfluid, phase-separated or coexisting superfluid/excess-fermion phases found in homogeneous or harmonically trapped systems, fermions in optical lattices have several insulating phases, including a molecular Bose-Mott insulator (BMI), a Fermi-Pauli (band) insulator (FPI), a phase-separated BMI/FPI mixture or a Bose-Fermi checkerboard (BFC). The molecular BMI phase is the fermion mixture counterpart of the atomic BMI found in atomic Bose systems, the BFC or BMI/FPI phases exist in Bose-Fermi mixtures, and lastly the FPI phase is particular to the Fermi nature of the constituent atoms of the mixture.

4 pages with 3 figures (Published version)

References in corpus (6)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
• Molecules of Fermionic Atoms in an Optical Lattice
• Tuning of heteronuclear interactions in a quantum-degenerate Fermi-Bose mixture
• Two-species fermion mixtures with population imbalance
• Fermion pairing with spin-density imbalance in an optical lattice

Cited by in corpus (11)

• All-optical production of a degenerate mixture of 6Li and 40K and creation of heteronuclear molecules
• Population imbalanced fermions in harmonically trapped optical lattices
• Quantum phases of Fermi-Fermi mixtures in optical lattices
• Interorbital Interactions in an SU(2)xSU(6)-Symmetric Fermi-Fermi Mixture
• Noise correlations of the ultra-cold Fermi gas in an optical lattice
• Quantum phases of constrained dipolar bosons in coupled one-dimensional optical lattices
• Thermodynamical approaches to efficient sympathetic cooling in ultracold Fermi-Bose atomic mixtures
• Correlated Phases of Population Imbalanced Fermi-Fermi Mixtures on an Optical Lattice
• Phase Separation of Superfluids in the Chain of Four-Component Ultracold Atoms
• Phase diagram of imbalanced fermions in optical lattices
• Ground State Properties of an Asymmetric Hubbard Model for Unbalanced Ultracold Fermionic Quantum Gases