磁场中准二维强耦合磁极化子的性质  

Properties of Quasi-Two-Dimensional Strong-Coupling Magnetopolarons in Magnetic Fields

作　　者：额尔敦朝鲁[1] 乌云其木格[2] 徐秋[1] 白旭芳[2] 

机构地区：[1]河北科技师范学院数理系,秦皇岛066004 [2]内蒙古民族大学物理与机电学院,通辽028043

出　　处：《Journal of Semiconductors》2006年第5期824-829,共6页半导体学报（英文版）

基　　金：内蒙古自治区自然科学基金(批准号:200208020110);河北科技师范学院博士基金资助项目~~

摘　　要：采用线性组合算符和改进的LLP变分法,研究了磁场中无限势垒量子阱内电子与界面光学声子强耦合、与体纵光学声子弱耦合系统的基态,得到了磁极化子的振动频率和自陷能随量子阱宽和磁场变化的规律.对CdF2/AgCl量子阱进行了数值计算,结果表明,磁极化子的振动频率和自陷能随阱宽的增加而减小,随磁场的增加而增大,但不同支声子与电子和磁场相互作用对磁极化子的振动频率和自陷能的贡献大不相同.此外,对以上现象进行了分析和解释.The ground state of a magnetopolaron that is weakly coupled with bulk longitudinal optical phonons and strongly coupled with interface optical phonons,in an infinite quantum well within magnetic fields is studied using the linear-combination operator and a modified LLP variational method. Rules for how the vibration frequency and self-trapping energy of the magnetopolaron change with the width of the quantum well and the magnetic fields are obtained. Our numerical results for a CdF2/AgCI QW show that the vibration frequency and the self-trapping energy of the magnetopolaron decrease with increasing well width and increase with increasing magnetic fields strength, but the contribution of interaction between the different branches of phonons and the electron and the magnetic fields to the vibration frequency and the self-trapping energy of the magnetopolaron are greatly different. The above-mentioned phenomena are also analyzed.

关 键 词：量子阱 磁极化子 振动频率 自陷能 

分 类 号：O471.4[理学—半导体物理]