非对称量子点中磁极化子有效质量的温度性质  

Temperature Properties of the Effective Mass of the Magnetopolaron in an Asymmetry Quantum Dot

作　　者：乌云其木格[1] 额尔敦朝鲁[2] 辛伟[2] 

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 [2]河北科技师范学院凝聚态物理研究所,河北秦皇岛066004

出　　处：《固体电子学研究与进展》2009年第4期534-537,共4页Research & Progress of SSE

基　　金：河北省自然科学基金(A2008000463);半导体超晶格国家重点实验室开放研究基金(CHJG200701)资助项目

摘　　要：采用Tokuda线性组合算符法和Lee-Low-Pines(LLP)变换法,研究了温度和磁场对非对称抛物量子点中弱耦合磁极化子性质的影响,推导出了弱耦合磁极化子的振动频率λ和有效质量m*与相关参数之间的函数关系式。数值计算结果表明,非对称量子点中弱耦合磁极化子的振动频率λ随量子点的横向受限强度ω1、纵向受限强度ω2和回旋频率ωc的增加而增大;磁极化子的有效质量m*随温度T的升高而减小,随耦合强度α的增加而增大。外磁场将对磁极化子的振动频率及其变化产生显著影响,而磁极化子的有效质量及其变化强烈地受到温度的影响。The influences of the temperature and the magnetic field on properties of the weak-coupling magnetopolaron in an asymmetry quantum dot are studied by using the Tokuda＇s linear-combination operator and the Lee-Low-Pines （LLP） variational method. The expressions for the vibration frequency A and the effective mass m＊ of the weak-coupling magnetopolaron as a function of the relevant parameters are derived. Numerical results indicate that vibration frequen- cy A will increase with increasing the transverse effective confinement strength ω1, the longitudi- nal effective confinement strength ω2 and the cyclotron frequency ωc, the effective mass m＊ will decrease with increasing the temperature T, and will increase with increasing the coupling strength a; the influence of the magnetic field on changes of the vibration frequency is greater; the temperature has greater influence on the changes of the effective mass.

关 键 词：非对称量子点 线性组合算符法 磁极化子 振动频率 有效质量 温度依赖性 

分 类 号：O469[理学—凝聚态物理]