非对称量子阱中磁极化子的性质  

Properties of magnetopolaron in asymmetry quantum well

作　　者：红兰[1] 戈君[1] 双山 刘达权 HONG Lan;GE Jun;SHUANG Shan;LIU Daquan(School of Physics and Electronic Information,Hulunbuir University,Hulunbuir 021008,China)

机构地区：[1]呼伦贝尔学院物理与电子信息学院,内蒙古呼伦贝尔021008

出　　处：《量子电子学报》2022年第5期728-735,共8页Chinese Journal of Quantum Electronics

基　　金：教育部高等教育司2020年产学合作协同育人项目,202002029015。

摘　　要：采用Pekar变分法研究了磁场对非对称量子阱中极化子性质的影响,理论推导得到磁极化子基态能量的表达式,分别讨论了磁极化子基态能量与波矢、阱宽、磁场回旋共振频率及阱深的关系。研究表明磁极化子基态能量是波矢和磁场回旋共振频率的增函数,是阱宽和阱深的减函数。由于晶体结构反演的非对称性以及磁场的作用,极化子能量发生Rashba自旋-轨道分裂和Zeeman分裂,分别讨论了强弱磁场下Rashba效应和Zeeman效应在能量分裂中所占的主导位置。由于声子的存在降低了极化子的总能量,所以极化子态比裸电子态更稳定,能量分裂也更稳定。The properties of magnetopolaron in asymmetry quantum well is studied by Pekar variation method. The ground state energy of magnetopolaron is derivated theoretically, and the relationship between ground state energy of magnetopolaron and wave vector, well width, magnetic field cyclotron resonance frequency and well depth is discussed respectively. It is shown that the magnetopolaron ground state energy is an increasing function of the wave vector and the magnetic field cyclotron resonance frequency,but a decreasing function of the well width and well depth. Due to the inversion asymmetry of crystal structure and the effect of magnetic field, the polaron energy will undergo Rashba spin-orbit splitting and Zeeman splitting. The dominant position of Rashba effect and Zeeman effect under the strong and weak magnetic fields is discussed respectively. Since the existence of phonons reduces the total energy of polarons, the polaron state is more stable than the bare electron state, and its energy splitting is also more stable.

关 键 词：凝聚态物理 Rashba效应 ZEEMAN效应 磁极化子 非对称量子阱 

分 类 号：TN304[电子电信—物理电子学]