Off-diagonal wave function Monte Carlo studies of Hubbard model I

被引：42
|
作者：
Yanagisawa, T [1 ]
Koike, S [1 ]
Yamaji, K [1 ]
机构：
[1] Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 11期
关键词：
Hubbard model; Monte Carlo method; off-diagonal functions;
D O I：
10.1143/JPSJ.67.3867
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We propose a Monte Carlo method, which is a hybrid method of the quantum Monte Carlo method and variational Monte Carlo theory, to study the Hubbard model. The theory is based on the off-diagonal and the Gutzwiller type correlation factors which are taken into account by a Monte Carlo algorithm. In the 4x4 system our method is able to reproduce the exact results obtained by the diagonalization. An application is given to investigate the half-filled band case of two-dimensional square lattice. The energy is favorably compared with quantum Monte Carlo data.
引用
收藏
页码：3867 / 3874
页数：8
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