Two-Site Holstein Model： a Variational Wavefunction Analysis  

作　　者：任清褒 陈庆虎 

机构地区：[1]Department of Physics, Lishui University, Lishui 323000 [2]Department of Physics, Zhejiang University, Hangzhou 310027

出　　处：《Chinese Physics Letters》2005年第11期2914-2917,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 19804009 and 10274067.

摘　　要：A novel variational approach is proposed to calculate the ground-state （GS） properties of the two-site Holstein model. By the linear superposition of two coherent states, which simulate the behaviour of the weak and strong coupling limits, we can obtain very accurate GS energy for arbitrary electron-phonon coupling constant. Other GS properties are also discussed. Moreover, the present concise approach is hopefully generalized to many other Holstein models.A novel variational approach is proposed to calculate the ground-state （GS） properties of the two-site Holstein model. By the linear superposition of two coherent states, which simulate the behaviour of the weak and strong coupling limits, we can obtain very accurate GS energy for arbitrary electron-phonon coupling constant. Other GS properties are also discussed. Moreover, the present concise approach is hopefully generalized to many other Holstein models.

关 键 词：MOLECULAR-CRYSTAL MODEL STRONG-COUPLING LIMIT DYNAMICAL PROPERTIES POLARONPROBLEM STATES 

分 类 号：O46[理学—电子物理学]