Quantum Monte Carlo Study of an Interaction-Driven Band Insulator to Metal Transition

Abstract

We study the transitions from band insulator to metal to Mott insulator in the ionic Hubbard model on a two dimensional square lattice using determinant Quantum Monte Carlo. Evaluation of the temperature dependence of the conductivity demonstrates that the metallic region extends for a finite range of interaction values. The Mott phase at strong coupling is accompanied by antiferromagnetic (AF) order. Inclusion of these intersite correlations changes the phase diagram qualitatively compared to dynamical mean field theory.

4 pages, 6 figures

References in corpus (2)

• Metal-insulator transition in two-dimensional electron systems
• Phase Diagram for Ultracold Bosons in Optical Lattices and Superlattices

Cited by in corpus (12)

• Band insulator to Mott insulator transition in a bilayer Hubbard model
• Metallic phase in the two-dimensional ionic Hubbard model
• Breakdown of Luttinger's theorem in two-orbital Mott insulators
• Temperature dependent correlations in covalent insulators
• Electronic phase transitions in the half-filled ionic Hubbard model
• Correlations in a band insulator
• Evolution of a band insulating phase from a correlated metallic phase
• Insulating behavior with spin and charge order in the ionic Hubbard model
• Delocalization effect of the Hubbard repulsion in exact terms and two dimensions
• Excitation Spectrum of One-dimensional Extended Ionic Hubbard Model
• Hatano-Nelson model with a periodic potential
• Static versus dynamic fluctuations in the one-dimensional extended Hubbard model