Supersolid Bose-Fermi Mixtures in Optical Lattices

Abstract

We study a mixture of strongly interacting bosons and spinless fermions with on-site repulsion in a three-dimensional optical lattice. For this purpose we develop and apply a generalized DMFT scheme, which is exact in infinite dimensions and reliably describes the full range from weak to strong coupling. We restrict ourselves to half filling. For weak Bose-Fermi repulsion a supersolid forms, in which bosonic superfluidity coexists with charge-density wave order. For stronger interspecies repulsion the bosons become localized while the charge density wave order persists. The system is unstable against phase separation for weak repulsion among the bosons.

4 pages, 5 pictures, Published version

References in corpus (12)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Supersolid hardcore bosons on the triangular lattice
• Bose-Fermi Mixtures in a Three-dimensional Optical Lattice
• Localization of bosonic atoms by fermionic impurities in a 3d optical lattice
• Supersolids versus phase separation in two-dimensional lattice bosons
• Mixtures of Bosonic and Fermionic Atoms in Optical Lattices
• Instabilities in binary mixtures of one-dimensional quantum degenerate gases
• Control of the interaction in a Fermi-Bose mixture
• Supersolid phases in the one dimensional extended soft core Bosonic Hubbard model
• Density wave and supersolid phases of correlated bosons in an optical lattice
• Competing Orders in two-dimensional Bose-Fermi mixtures
• Pairing and density-wave phases in Boson-Fermion mixtures at fixed filling

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