量子阱中弱耦合磁极化子的性质  

Properties of the Weak-coupling Magnetopolaron in a Quantum Well

作　　者：简荣华[1] 高宽云[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）》2008年第1期4-7,共4页Journal of Inner Mongolia Minzu University：Natural Sciences

基　　金：国家自然科学基金项目(10347004);内蒙古高校科研项目(NJ05074)

摘　　要：采用线性组合算符及幺正变换方法,研究了无限深量子阱中弱耦合磁极化子的振动频率、基态能量和电子-LO声子相互作用能.对不同材料的量子阱进行了数值计算,结果表明:磁极化子的振动频率随回旋共振频率的增加而增大;电子-LO声子相互作用能随阱宽度的增加而单调增加,且在阱宽很小时变化显著,在阱宽较大时变化缓慢,最终趋于体材料的值;磁极化子的基态能量随阱宽和电子-声子耦合常数的增加而减小,随回旋共振频率的增加而增大.The vibration frequency and ground state energy of the weak- coupling magnetopolaron, and the interaction energy of the electron - LO phonon in an infinite quantum well were studied by using linear combination operator and unitary transformation method. Numerical results for the different materials show that the vibration frequency of the magnetopolaron will increase with increasing the cyclotron-resonance frequency; The interaction energy of the electron - LO phonon will monotonous increase with increasing the width of quantum well, which the increasing is very obvious when the width of quantum well is very small and is slowly when the width of quantum well is big, and it will tend to the three- dimensional value of the material ;The ground state energy of the magnetopolaron will decrease with increasing the width of quantum well and electron- phonon coupling constant, but it will increase with increasing the cyclotron- resonance frequency.

关 键 词：无限深量子阱 磁极化子 线性组合算符 

分 类 号：O469[理学—凝聚态物理]