THE 2-DIMENSIONAL HUBBARD-MODEL - A RENORMALIZATION-GROUP ANALYSIS

被引：0
|
作者：
PEREZCONDE, J
PFEUTY, P
机构：
[1] Laboratoire de Physique des Solides, Univ. Paris-Sud, 91405 Orsay Cédex
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1992年 / 104卷
关键词：
D O I：
10.1016/0304-8853(92)90785-M
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The two-dimensional Hubbard model is analyzed using the real-space renormalization group method. We have considered isotropic and anisotropic hopping in the half-filled band. The insulating gap is obtained in both cases. The system is found to be metallic up to a finite value of U in the anisotropic system t(x) not-equal t(y), where U is the interaction parameter and t(x)(t(y)) is the hopping on the x(y) direction. When t(x) = t(y) we find an insulator state for U > 0.
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页码：251 / 252
页数：2
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