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.

*NSF DMR 0312261

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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