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Article Dans Une Revue Physical Review Letters Année : 2007

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

Résumé

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 order. Inclusion of these intersite correlations changes the phase diagram qualitatively compared to dynamical mean field theory.

Dates et versions

hal-00138065 , version 1 (23-03-2007)

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Citer

N. Paris, K. Bouadim, Frederic Hebert, G. George Batrouni, R. T. Scalettar. Quantum Monte Carlo Study of an Interaction-Driven Band-Insulator–to–Metal Transition. Physical Review Letters, 2007, 98, pp.046403. ⟨10.1103/PhysRevLett.98.046403⟩. ⟨hal-00138065⟩
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