COMPREHENSIVE MEAN FIELD-THEORY FOR THE HUBBARD-MODEL

被引：66

作者：

JANIS, V

VOLLHARDT, D

机构：

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 1992年 / 6卷 / 5-6期

关键词：

D O I：

10.1142/S0217979292000438

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We derive an exact expression for the grand potential of the Hubbard model in d = infinity dimensions. By simplifying the energy transfer between up and down spins we obtain a comprehensive mean-field theory for this model. It is (i) thermodynamically consistent in the entire range of input parameters, (ii) conserving and, (iii) exact in several non-trivial limits, e.g. in the free (U --> 0), atomic (t --> 0) and Heisenberg (U >> t, n = 1) limit.

引用

页码：731 / 747

页数：17