泛函积分方法与三带Hubbard模型中反铁磁激发谱的计算  

Functional Integrals Method and Calculation of the Antiferromagnetic Excitation Spectrum in the Three-band Hubbard Model

作　　者：田红金[1] 颜骏[1] 杨晓焕[1] 陈海霖[1] 

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610066

出　　处：《四川师范大学学报（自然科学版）》2016年第3期388-397,共10页Journal of Sichuan Normal University（Natural Science）

基　　金：四川省教育厅自然科学重点基金(11ZA100)

摘　　要：根据泛函积分方法推导三带Hubbard模型中的自由Green函数.由矩阵形式的Dyson-Grokov方程得到正常与反常Green函数;这些Green函数可以描述反铁磁态和超导态的物理性质.在长波近似下计算反铁磁序矢量共存于铜氧格点时的激发谱,还讨论反铁磁序矢量对能谱的影响.In this paper,the free Green＇s function of three-band Hubbard model was derived according to the functional integral methods. We obtained the normal and abnormal Green＇s function by the matrix form of Dyson-Grokov equations. The Green＇s function can describe the physical properties of antiferromagnetic state and the superconducting state. In the long wave approximation,the excitation spectrum was calculated when the antiferromagnetic order vector co-existed in copper and oxygen lattices. Moreover,the influence of antiferromagnetic order vector on the energy spectrum was also discussed.

关 键 词：泛函积分 温度Green函数 三带Hubbard模型 反铁磁激发谱 

分 类 号：O412[理学—理论物理] O469[理学—物理]