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

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

2006-07-27

arxiv.org/abs/cond-mat/0607707v1

Phys. Rev. Lett. 98, 046403 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.98.046403

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.

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