Features of the polaron ground state in one-dimensional Holstein model

作     者：REN XueZao LIAO Xu LI Lei WANG KeLin 

作者机构：School of ScienceSouthwest University of Science and TechnologyMianyang 621010China Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2009年第52卷第9期

页      面：1302-1306页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：Supported by the Natural Science Foundation of Sichuan Province  China (Grant No. 2006C028) 

主　　题：coherent-state orthogonal expansion polaron simulated annealing method 

摘      要：Applying the method of coherent state orthogonal expansion, we expand the trial wave functions of ground state to the third order. We find that the ground state energy of the system decreases with the increase of expansion orders. Especially, at the zeroth order approximation, the probability distribution of the electron at different sites exhibits a soliton peak. However, the probability distribution of the electron at each site becomes identical, when we expand the trial wave functions of ground state to the higher orders.