Phys. Rev. Lett. 98, 046403 (2007) [4 pages]Quantum Monte Carlo Study of an Interaction-Driven Band-Insulator–to–Metal TransitionReceived 26 July 2006; published 25 January 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.046403
DOI:
10.1103/PhysRevLett.98.046403
PACS:
71.10.Fd, 02.70.Uu, 71.30.+h
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