重整化平均场理论及其在铜氧化物高温超导材料中的应用  

Renormalized Meanfield Theory and its Application in High Temperature Cuprate Superconductors

作　　者：易伟柱 奚文杰 陈伟强 YI Weizhu;XI Wenjie;CHEN Weiqiang(Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]南方科技大学物理系,广东深圳518055

出　　处：《低温物理学报》2020年第2期59-67,共9页Low Temperature Physical Letters

摘　　要：对铜氧化物高温超导体的研究是凝聚态物理中最重要的问题之一.理论研究上的困难在于铜氧化物高温超导材料中单占据条件所导致的强关联效应.铜氧化物高温超导材料可以用t-J模型进行描述,而上述的单占据条件则体现于t-J模型中的Gutzwiller投影算符.重整化平均场理论(RMFT)是一种处理这类由Gutzwiller投影算符所导致的强关联效应比较有效的方法.本文首先对铜氧化物高温超导材料进行简单的介绍.然后我们将重点介绍Gutzwiller近似.最后我们会介绍重整化平均场理论,以及其在铜氧化物高温超导材料和其他一些强关联材料中的应用.The high temperature cuprate superconductors are one of the most important field in condensed matter physics.The main theoretical difficulty in the study is the strongly correlation effect originated from the single occupation condition,which is tracked by the Gutzwiller projection in the t-J model.The renormalized mean field theory can be used to deal with the Gutzwiller projection in such kinds of situations.In this paper,we will briefly introduce the cuprate superconductor first.Then,we will focus on the Gutzwiller approximation,which is crucial for the subsequent renormalized mean-field processing.Finally,we will introduce the RMFT theory,and its application in cuprate superconductors and other strongly correlated systems.

关 键 词：投影算符 重整化 凝聚态物理 高温超导材料 平均场理论 铜氧化物 强关联 关联效应 

分 类 号：O511.3[一般工业技术—材料科学与工程] O469[理学—低温物理]