比较两种方法计算弗留里希极化子的能量

A Comparison of two Methods to Calculate the Ground-state Energy of a Polaron

在消去电子坐标的正则变换基础之上,采用包含双声子关联效应的波函数计算运动极化子的基态能量,得到了双声子关联效应对能量的修正,并与在LLP理论基础上用微扰论求得的能量修正作比较.结果发现:在相同的动量下,前者求得的系统的基态能量较低.

Based on LLP canonical transformation, a different polaron ground-state which includes the two-phonon correlation is adopted to calculate the ground-state energy of polaron. The energy created by two-phonon correlation is obtained. The result shows that the ground-state energy obtained including the correlation effect is smaller than that obtained by perturbative theory.