Spectral properties of strongly correlated bosons in two-dimensional optical lattices
Spectral properties of strongly correlated bosons in two-dimensional optical lattices
Spectral properties of the two-dimensional Bose-Hubbard model, which emulates ultracold gases of atoms confined in optical lattices, are investigated by means of the variational cluster approach. The phase boundary of the quantum phase transition from Mott phase to superfluid phase is calculated and compared to recent work. Moreover the single-particle …