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

ORAL

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.

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Authors

  • Norman Paris

    University of California, Davis, University of California, in Davis

  • Karim Bouadim

    Institut Non-Lin\'eaire de Nice, UMR 6618 CNRS, Universit\'e de Nice--Sophia Antipolis

  • Frederic Hebert

    University of Nice, Institut Non-Lin\'eaire de Nice, UMR 6618 CNRS, Universit\'e de Nice--Sophia Antipolis

  • George Batrouni

    University of Nice, Institut Non-Lin\'eaire de Nice, UMR 6618 CNRS, Universit\'e de Nice--Sophia Antipolis

  • Richard T. Scalettar

    University of California, Davis, UC Davis