有限格点一维Holstein极化子研究  

Study of one-dimensional Holstein polaron in infinite lattice

作　　者：任学藻[1] 廖旭[1] 黄书文[1] 汪克林[2] 

机构地区：[1]西南科技大学理学院,绵阳621010 [2]中国科学技术大学近代物理系,合肥230026

出　　处：《物理学报》2009年第4期2680-2683,共4页Acta Physica Sinica

基　　金：四川省自然科学基金(批准号:2006C028)资助的课题~~

摘　　要：利用相干态正交化展开法,得到了一维Holstein模型基态能量的解析表达式.为了便于比较,将系统的基态试探波函数逐级展开到三级近似,计算了不同格点、不同耦合强度下的基态能量,在展开到3级近似时,所得结果与数值计算一致.Applying the method of coherent state orthogonal expansion,an analytical expression of the ground state energy for one-dimensional Holstein model is obtained.We expand the trial wave function of ground state to third order,and calculate the ground state energy for different lattice sites and different coupling intensities.In the third order approximation,the ground state energy agrees with the numerical solution.

关 键 词：相干态正交化展开 极化子 模拟退火方法 

分 类 号：O469[理学—凝聚态物理]