Metallic phase in the two-dimensional ionic Hubbard model
arXiv:0705.0755 · doi:10.1103/PhysRevB.76.085112
Abstract
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.
References in corpus (5)
- Quantum Monte Carlo Study of an Interaction-Driven Band Insulator to Metal Transition
- Band insulator to Mott insulator transition in a bilayer Hubbard model
- Metallic interface at the boundary between band and Mott insulators
- Mott and Band Insulator Transitions in the Binary Alloy Hubbard Model
- Plaquette bond order wave in the quarter-filled extended Hubbard model on the checkerboard lattice