Condensed Matter Physics, 2011, vol. 14, No. 4, p. 43301:1-8
Bose-Fermi-Hubbard model on a lattice with two nonequivalent sublattices
(Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine )
Phase transitions in systems described by Bose-Fermi-Hubbard model on a lattice with two nonequivalent sublattices are investigated in this work. The case of hard-core bosons is considered and pseudospin formalism is used. Phase diagrams are built in the plain of chemical potential of the bosons-bosonic hopping parameter. It is shown that in the case of anisotropic hopping, the region of the supersolid phase existence is possible for a smaller parameter space.
Bose-Fermi-Hubbard model, optical lattice, phase transitions
37.10.Jk, 67.85.Pq, 71.10.Fd