Quantum Monte Carlo study of an interaction-driven band-insulator-to-metal transition

被引：88
|
作者：
Paris, N. [1 ]
Bouadim, K.
Hebert, F.
Batrouni, G. G.
Scalettar, R. T.
机构：
[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
[2] Univ Nice Sophia Antipolis, CNRS, UMR 6618, Inst Non Lineaire Nice, F-06560 Valbonne, France
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 04期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.98.046403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：4
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