Phase transitions of the ionic Hubbard model on the honeycomb lattice

摘要: Many-body problem on the honeycomb lattice systems have been subject of considerable experimental and theoretical interest. Here we investigate phase transitions ionic Hubbard model with an alternate potential for half filling hole doping cases by means cellular dynamical mean field theory combining continue time quantum Monte Carlo as impurity solver. At filling, increase interaction at a fixed potential, find single particle gap decreases firstly, reaches minimum critical Uc, then increases upturn. there is band insulator to Mott transition accompanying presence antiferromagnetic order. Away from filing, system shows three phases different values density interaction, paramagnetic metal, metal ferromagnetic metal. Further, present staggered number, double occupancy, magnetization, uniform magnetization spectral properties, which exhibit characteristic features those phases.