Metallic phase in the two-dimensional ionic Hubbard model

Details Metallic phase in the two-dimensional ionic Hubbard model Metallic phase in the two-dimensional ionic Hubbard model

2007-05-05

arxiv.org/abs/0705.0755v1

Phys Rev B76, 085112 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.76.085112

We investigate the phases of the ionic Hubbard model in a two-dimensional square lattice using determinant quantum Monte Carlo (DQMC). At half-filling, when the interaction strength or the staggered potential dominate we find Mott and band insulators, respectively. When these two energies are of the same order we find a metallic region. Charge and magnetic structure factors demonstrate the presence of antiferromagnetism only in the Mott region, although the externally imposed density modulation is present everywhere in the phase diagram. Away from half-filling, other insulating phases are found. Kinetic energy correlations do not give clear signals for the existence of a bond-ordered phase.

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