Functional integrals and 1/h expansion in the boson-fermion model

被引：3
|
作者：
Yan, Jun [1 ]
机构：
[1] Sichuan Normal Univ, Dept Phys, Chengdu 610066, Peoples R China
来源：
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2016年 / 452卷
关键词：
Functional integrals; 1/h expansion; Boson fermion model; Excitation spectrum; SUPERCONDUCTIVITY;
D O I：
10.1016/j.physa.2016.02.024
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The effective action of boson-fermion model is derived by means of the functional integrals method and Popov-Faddeev canonical transformations. The energy gap equation and excitation spectrum equation are obtained from first order and second order perturbation expansions of functional determinant. In the long wave approximation, some analytical expressions of excitation spectrum are calculated by using the 1/h expansion technique, the results showed that analytical calculation is in good agreement with the numerical calculation. Moreover, the Nambu sum rules of Higgs bosons are analyzed and discussed. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：145 / 150
页数：6
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