量子点中极化子的速率对光学声子平均数的影响  

Influence of velocity of polaron in quantum dots on the mean number of optical phonons

作　　者：张鹏[1] 肖景林[2] 

机构地区：[1]中国石油大学数理系,北京102249 [2]内蒙古民族大学物理系,内蒙古通辽028043

出　　处：《中国石油大学学报（自然科学版）》2007年第6期127-129,134,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(10347004);中国石油大学(北京)校长基金资助项目(2005)

摘　　要：研究了量子点中极化子的性质。采用Tokuda改进的线性组合算符法、拉格朗日乘子法和变分法,导出了量子点中极化子的振动频率和声子平均数,讨论了在强弱耦合情况下极化子的速率对光学声子平均数的影响。研究结果表明,光学声子平均数随极化子的速率增加而增大。The properties of polaron in quantum dots were investigated, The vibration frequency and the mean number of phonons of polaron in quantum dots were calculated by using Tokuda＇s improved linear combination operator and Lagrange multiplier and variational method. Influence of the velocity of the polaron on the mean number of optical phonons were discussed for strong-coupling and weak-coupling, The results show that the mean number of phonons increases with the velocity of the polaron increasing.

关 键 词：量子点 极化子速率 光学声子平均数 

分 类 号：O469[理学—凝聚态物理]