GROUND-STATE ENERGY OF THE ONE-DIMENSIONAL HUBBARD-MODEL IN A SIMPLE SELF-CONSISTENT VERSION OF THE LADDER APPROXIMATION

被引：6

作者：

BUZATU, FD ^{[1
]}

机构：

[1] INST ATOM PHYS,INST PHYS & NUCL ENGN,DEPT THEORET PHYS,R-76900 BUCHAREST,ROMANIA

来源：

MODERN PHYSICS LETTERS B | 1995年 / 9卷 / 18期

关键词：

D O I：

10.1142/S0217984995001145

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The ground-state energy of the one-dimensional Hubbard model is calculated within the ladder approximation; from the comparison with the exact results in the repulsive case, it follows that the approximation is good at low densities or small couplings. The ladder approximation can be improved by imposing a self-consistency condition; using a simple assumption, the results become close to the exact ones in a large range of the model parameters.

引用

页码：1149 / 1157

页数：9

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