四极耦合系统频谱函数的三分点Pade近似

Three Fraction Pade Approach Spectral Functions to the Coupled Quadrupole System

精确计算出四级耦合系统中高温极限情况的二阶、四阶级矩,在Pade近似下获得自旋对关联函数的谱函数P(ω)。以不同的波矢对谱函数给出不同的激发态模式。讨论了这些参数作用于广谱函数的效果。

The spectral function P(ω) of the spin pair correlation function in a coupled quadrupole system are evaluated using the pade approximation starting from the exact derivation of frequency second and fourth order moments at high temperature limit. Different excited state model of the spectral functions are given for different wave vectors. The effects of these parameters on the generalized spectral function are discussed.