An Effective Description of Electron Correlation in the Green Function Approach

作     者：LIU Yu-Liang 刘玉良

作者机构：Department of PhysicsRenmin University of ChinaBeijing 100872 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2013年第30卷第4期

页      面：161-165页

核心收录：

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

基　　金：the National Natural Science Foundation of China under Grant No 11074301 the National Basic Research Program of China under Grant No 2012CB921704 

主　　题：perturbation interaction potential 

摘      要：Beyond the usual many body perturbation theory,with the eigenfunctional theory,we directly calculate the correlation function produced by the Coulomb interaction of electrons in the equation of one-electron Green function,and give the general expression of the non-local effective interaction potential in a Hartree-type potential,which is absent in all previous many body perturbation *** effective interaction potential originates from the quantum many body effect of the system,and it cannot be obtained directly by the usual perturbation expression ***,using theoretical models,we demonstrate that this effective interaction potential can be used to characterize the electron correlation strength of the system.