Effects of Thermal Lattice Vibration on the Effective Potential of Weak-Coupling Bipolaron in a Quantum Dot  

作　　者：Eerdunchaolu Wuyunqimuge XIAO Xin HAN Chao XIN Wei 额尔敦朝鲁;乌云其木格;肖欣;韩超;辛伟(Institute of Condensed Matter Physics,Hebei Normal University of Science&Technology,Qinhuangdao 066004,China;College of Physics and Electronic Information,Inner Mongolia University for Nationalities,Tongliao 028043,China)

机构地区：[1]Institute of Condensed Matter Physics,Hebei Normal University of Science&Technology,Qinhuangdao 066004,China [2]College of Physics and Electronic Information,Inner Mongolia University for Nationalities,Tongliao 028043,China

出　　处：《Communications in Theoretical Physics》2012年第1期157-160,共4页理论物理通讯（英文版）

基　　金：Supported by the Items of Institution of Higher Education Scientific Research of Inner Mongolia under Grant No. NJ101116

摘　　要：Based on the Huybrechts' linear-combination operator,effects of thermal lattice vibration on the effective potential of weak-coupling bipolaron in semiconductor quantum dots are studied by using the LLP variational method and quantum statistical theory.The results show that the absolute value of the induced potential of the bipolaron increases with increasing the electron-phonon coupling strength,but decreases with increasing the temperature and the distance of electrons,respectively;the absolute value of the effective potential increases with increasing the radius of the quantum dot,electron-phonon coupling strength and the distance of electrons,respectively,but decreases with increasing the temperature;the temperature and electron-phonon interaction have the important influence on the formation and state properties of the bipolaron:the bipolarons in the bound state are closer and more stable when the electron-phonon coupling strength is larger or the temperature is lower;the confinement potential and coulomb repulsive potential between electrons are unfavorable to the formation of bipolarons in the bound state.

关 键 词：quantum dot BIPOLARON induced potential effective potential thermal lattice vibration polaroneffects 

分 类 号：O471.1[理学—半导体物理] O469[理学—物理]