抛物量子点中弱耦合极化子声子色散效应  

Effect of phonon dispersion on weak-coupling polaron in a parabolic quantum dot

作　　者：杨洪涛[1] 冀文慧[1] 呼和满都拉[1] 

机构地区：[1]集宁师范学院物理系,内蒙古乌兰察布012000

出　　处：《量子电子学报》2015年第2期241-245,共5页Chinese Journal of Quantum Electronics

基　　金：内蒙古自治区高等学校科学研究项目(NJZY12248)

摘　　要：利用线性组合算符和幺正变换相结合的方法,研究了声子色散对抛物量子点中弱耦合极化子性质的影响。计及体纵光学(LO)声子抛物色散,导出了量子点中极化子的基态能量和自陷能随量子点有效受限长度、电子-纵光学声子耦合常数和声子色散系数的变化关系。数值计算结果表明基态能量随声子色散系数的增大而减小,而自陷能随声子色散系数的增大而增大。Influence of the phonon dispersion on the properties of the weak-coupling polaron in a parabolic quantum dot was investigated by using the linear combination operator and unitary transformation method.Taking account of the longitudinal optical（LO） phonons dispersion in a parabolic approximation,the ground state energy and the self-trapping energy of the polaron in a parabolic quantum dot as a function of the effective confinement length of the quantum dot,the electron-LO-phonon coupling constant and the coefficient of the phonon dispersion were obtained.Numerical calculation results show that the ground state energy decreases with the coefficient of the phonon dispersion increasing,the self-trapping energy increases with increasing the coefficient of phonon dispersion.

关 键 词：光电子学 抛物量子点 极化子 线性组合算符 声子色散 

分 类 号：O469[理学—凝聚态物理]