BCS-type mean-field theory for the t-J model in the SU(2|1) superalgebra representation

被引：4
|
作者：
Kochetov, E [1 ]
Mierzejewski, M
机构：
[1] Joint Inst Nucl Res, Bogolyubov Theoret Lab, Dubna 141980, Russia
[2] Silesian Univ, Inst Phys, PL-40007 Katowice, Poland
来源：
PHYSICAL REVIEW B | 2000年 / 61卷 / 02期
关键词：
D O I：
10.1103/PhysRevB.61.1580
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A simple version of the Bardeen-Cooper-Schrieffer (BCS)-type mean-field theory for the t-J model is developed. The present approach rigorously treats the constraint of no doubly occupied states and invokes two local order parameters to implement spontaneous breaking of the global U(1) x U(1) symmetry. This is achieved by identifying the Hubbard operators with generators of the SU(2\1) superalgebra in the fundamental representation and employing the ensuing CP1\1 parametrization for dynamical variables. As a result, an improved phase diagram T-c(delta) in the paramagnetic phase is obtained.
引用
收藏
页码：1580 / 1583
页数：4
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