Spontaneous symmetry breaking in the colored Hubbard model

被引：20

作者：

Baier, T ^{[1
]}

Bick, E ^{[1
]}

Wetterich, C ^{[1
]}

机构：

[1] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.62.15471

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Hubbard model is reformulated in terms of different "colored" fermion species for the electrons or holes at different lattice sites. Antiferromagnetic ordering or d-wave superconductivity can thm be described in terms of translationally invariant expectation values for colored composite scaler fields. A suitable mean field approximation for the two-dimensional colored Hubbard model shows indeed phases with antiferromagnetic ordering or d-wave superconductivity at low temperature. At low enough temperature the transition to the antiferromagnetic phase is of first order. The present formulation also allows an easy extension to more complicated microscopic interactions.

引用

页码：15471 / 15479

页数：9

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