斜磁场作用下抛物量子点的折射率系数变化规律研究  

Change law of refractive index coefficient of parabolic quantum dots under tilted magnetic field

作　　者：叶纯宝 李学超 YE Chunbao;LI Xuechao(School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学力学与光电物理学院,安徽淮南232001

出　　处：《阜阳师范大学学报（自然科学版）》2020年第2期12-16,共5页Journal of Fuyang Normal University:Natural Science

基　　金：安徽省自然科学基金(1508085QF140);高校优秀青年人才支持计划(gxyqZD2018039)资助。

摘　　要：本文首先使用有效质量近似的方法研究了在斜磁场作用下各向异性抛物量子点系统,并求得了系统的能级与波函数.然后运用密度矩阵与迭代的方法得到系统的线性、非线性以及总的折射率改变的表达式,使用典型的GaAs材料来进行数值计算.计算结果表明,磁场的倾斜角度以及系统参数对于总的折射率系数的改变有较大的影响,随着磁场倾斜角度的增加,总的光折射率系数改变的峰值却在减少,并且向着高能量方向移动;然而随着系统结构参数的增加,总的光折射率系数改变却在不断的增加.The anisotropic parabolic quantum disk system under the oblique magnetic field is studied by the method of effective mass approximation,and the energy level and wave function of the system are further obtained.The expressions of linear,nonlinear,and total refractive index changes of the system are then obtained by density matrix and iterative methods,using typical GaAs materials for numerical calculations.The calculation results show that the tilt angle of the magnetic field and the system parameters have a great influence on the change of the total refractive index coefficient.As the tilt angle of the magnetic field increases,the peak value of the total refractive index change decreases,and the energy is toward high energy.The direction moves,however,as the structural parameters of the system increase,the total refractive index coefficient changes continuously.

关 键 词：量子点 折射率系数变化 斜磁场 

分 类 号：O437[机械工程—光学工程]