Phase separation in the Hubbard model using the dynamical cluster approximation

被引：55

作者：

Macridin, A. ^{[1
]}

Jarrell, M.

Maier, Th.

机构：

[1] Univ Cincinnati, Cincinnati, OH 45221 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 08期

基金：

美国国家科学基金会;

关键词：

T-J; GROUND-STATE; HOLES; SUPERCONDUCTIVITY; ORDER; SPINS;

D O I：

10.1103/PhysRevB.74.085104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phase separation in the Hubbard model is investigated with the dynamical cluster approximation. We find that it is present in the paramagnetic solution for values of filling smaller than 1 and at finite temperature when a positive next-nearest-neighbor hopping is considered. The phase-separated region is characterized by a mixture of a strongly correlated metallic and Mott insulating phases. Our results indicate that phase separation is driven by the formation of doped regions with strong antiferromagnetic correlations and low kinetic energy.

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页数：5

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