用重整化群流方程方法求解t-J模型元激发能谱  

Flow equations for solving elementary excitation energy spectrum of the t-J model

作　　者：汪洪[1] 娄平[1] 庄永河[2] 

机构地区：[1]安徽大学物理系,合肥230039 [2]中国电子科技集团公司第43研究所,合肥230022

出　　处：《物理学报》2004年第2期577-581,共5页Acta Physica Sinica

摘　　要：t J模型是研究电子强关联作用和高Tc 超导理论的重要模型之一 .将重整化群方法应用于t J模型 ,得出相应的流方程 ,再由流方程求解t J模型的元激发能谱 ,并利用函数的对称性 ,解出t J模型在零温条件下能谱的具体表达式 。The t-J model is one of the most important models that is often used to study the theory of the effect of strong electron correlations and high-T c superconductivity. In this article, the method of renormalization group is used to investigate the t-J model and the elementary excitation energy spectrum of the t-J model is obtained by using the flow equations. Using the symmetry of functions, we can solve the specific expression of the energy spectrum. The result is compared with the result of Green's function method.

关 键 词：重整化群 T-J模型 流方程 电子强关联作用 临界转变温度 超导理论 格林函数法 湮没算符 

分 类 号：O582[理学—物理]