由流方程求解非零温条件下t-J模型能谱

t_J模型是研究电子强关联作用和高T_c超导理论的重要模型之一. 将重正化群流 方程方法应用于t_J模型，分别解出了t_J模型在非零温条件下费米子和玻色子元激发能谱的 解析式. 并将结果与采用格林函数方法求解的结果作了比较，两者基本一致.重正化群流方 程方法解出的结果是解析解，而格林函数方法求解的结果是数值解. 关键词： 重正化群 t－J模型 流方程

Flow equations for solving energy spectrum ( T≠ 0)of the t-J model

The t_J model is one of the most important models that is often used to stud y the theory of the effect of strong electron correlations and high_T_c superconductivity. In this article, the method of renormalization group is use d to investigate the t_J model， and the elementary excitation energy spectra of t_J model (Ｔ≠０) are obtained by the flow equations. The result is compared with that of Green's function method and agrees with its result. At th e same time, the result of renormalization group method is the analytical soluti on while that of Green’s function method is the numerical solution.