First-order Mott transition at zero temperature in two dimensions: Variational plaquette study

被引：69

作者：

Balzer, M. ^{[1
]}

Kyung, B. ^{[2
,3
]}

Senechal, D. ^{[2
,3
]}

Tremblay, A. -M. S. ^{[2
,3
]}

Potthoff, M. ^{[4
]}

机构：

[1] Univ Wurzburg, Inst Theoret Phys & Astrophys, Wurzburg, Germany

[2] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

[3] Univ Sherbrooke, RQMP, Sherbrooke, PQ J1K 2R1, Canada

[4] Univ Hamburg, Inst Theoret Phys 1, D-2000 Hamburg, Germany

来源：

EPL | 2009年 / 85卷 / 01期

关键词：

ENERGY-FUNCTIONAL APPROACH; MEAN-FIELD THEORY; INFINITE DIMENSIONS; HUBBARD-MODEL; SUPERCONDUCTIVITY; FERMIONS; SYSTEMS;

D O I：

10.1209/0295-5075/85/17002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nature of the metal-insulator Mott transition at zero temperature has been discussed for a number of years. Whether it occurs through a quantum critical point or through a first-order transition is expected to profoundly influence the nature of the finite-temperature phase diagram. In this paper, we study the zero temperature Mott transition in the two-dimensional Hubbard model on the square lattice with the variational cluster approximation. This takes into account the influence of antiferromagnetic short-range correlations. By contrast to single-site dynamical mean-field theory, the transition turns out to be first order even at zero temperature. Copyright (C) EPLA, 2009

引用

页数：6

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