非对称量子点中强耦合磁极化子的声子平均数  

Mean Number of Phonons for Strong-Coupling Magnetopolaron in an Asymmetry Quantum Dot

作　　者：乔红光[1] 赵翠兰[1] 

机构地区：[1]内蒙古民族大学物理与电子信息学院,内蒙古通辽028043

出　　处：《内蒙古民族大学学报（自然科学版）》2010年第5期487-490,494,共5页Journal of Inner Mongolia Minzu University：Natural Sciences

基　　金：国家自然科学基金资助项目(10747002);内蒙古自然科学基金资助项目(20080404MS0109)

摘　　要：采用Tokuda的改进的线性组合算符和幺正变换相结合的方法研究了磁场和极化子速率对非对称量子点中强耦合磁极化子性质的影响.导出了磁极化子的声子平均数与量子点的横向和纵向有效受限长度、电子-声子耦合强度、磁场的回旋频率和极化子的速率的依赖关系.结果表明磁极化子的声子平均数随量子点的横向和纵向有效受限长度的减小而迅速增大,表现出新奇的量子尺寸限制效应.声子平均数随电子-声子耦合强度、磁场回旋频率和极化子的速率的增加而增大.The influence of the magnetic field and the velocity of polaron on the properties of strong-coupling magnetopolaron in an asymmetric quantum dot are studied by using the Tokuda’s improved linear combination operator and the unitary transformation methods.The relation of the mean number of phonons for strong-coupling magnetopolaron with the transverse and longitudinal effective confinement length of quantum dot,the electron-phonon coupling strengtht,he cyclotron frequency of a magnetic field and the velocity of polaron ware derived.Numerical calculations are performed and the results show that the mean number of phonons of strong-coupling magnetopolaron in an asymmetric quantum dot will increase rapidly with decreasing the transverse and longitudinal effective confinement length of quantum dot.These can be attributed to the interesting quantum size effects.The mean number of phonons are an increasing functions of the electron-phonon coupling strength,the cyclotron frequency of a magnetic field and the velocity of polaron.

关 键 词：非对称量子点 强耦合磁极化子 改进的线性组合算符 声子平均数 

分 类 号：O469[理学—凝聚态物理]