Band insulator to Mott insulator transition in a bilayer Hubbard model

Abstract

The ground state phase diagram of the half-filled repulsive Hubbard model in a bilayer is investigated using cluster dynamical mean field theory. For weak to intermediate values of Coulomb repulsion $U$, the system undergoes a transition from a Mott insulating phase to a metallic phase and then onto a band insulating phase as the interlayer hopping is increased. In the strong coupling case, the model exhibits a direct crossover from a Mott insulating phase to a band insulating phase. These results are robust with respect to the presence or absence of magnetic order.

4 pages; 5 figures, submitted to Phys. Rev. B

References in corpus (2)

• Quantum Monte Carlo Study of an Interaction-Driven Band Insulator to Metal Transition
• Cellular Dynamical Mean Field Theory for the 1D Extended Hubbard Model

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• Magnetic and Transport Properties of a Coupled Hubbard Bilayer with Electron and Hole Doping
• Correlations in a band insulator