SINGLE-HOLE STATE IN HALF-FILLED 2D HUBBARD-MODEL

被引：2
|
作者：
LO, CF
机构：
[1] Department of Physics, Florida State University, Tallahassee, 32306-3016, FL
来源：
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS | 1991年 / 13卷 / 01期
关键词：
D O I：
10.1007/BF02451281
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have investigated the ground state of a single hole in the half-filled Hubbard model in a 2D square lattice using the coupled-cluster method. In particular we obtained an analytical expression of the hole energy dispersion function epsilon-(k) which is consistent with earlier studies on the t-J model in the strong-coupling limit. An appreciable discrepancy on the hole energy bandwidth is, however, observed between the Hubbard model and the t-J model. We believe that this discrepancy is due to the absence of the three-site interaction term in the t-J model.
引用
收藏
页码：127 / 130
页数：4
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