抛物势对非对称半指数量子阱中弱耦合极化子振动频率的影响  

The Influence of Parabolic Potential on Vibrational Frequency of Weak-coupling Polaron in a GaAs Asymmetrical Semi-exponential Quantum Well

作　　者：白瑞锋[1] 肖景林[1] BAI Rui-feng;XIAO Jing-lin(Institute of Condensed Matter Physics,Inner Mongolia University for Nationalities,Tongliao 028043,China)

机构地区：[1]内蒙古民族大学凝聚态物理研究所,内蒙古通辽028043

出　　处：《内蒙古民族大学学报（自然科学版）》2020年第5期369-372,共4页Journal of Inner Mongolia Minzu University：Natural Sciences

基　　金：国家自然科学基金项目(11464033);内蒙古民族大学科学研究项目(NMDYB15021)。

摘　　要：研究了x和y方向的非对称抛物受限势的受限长度lx和ly对GaAs非对称半指数量子阱中弱耦合极化子振动频率性质的影响.采用线性组合算符和两次幺正变换的方法导出了GaAs非对称半指数量子阱中弱耦合极化子的振动频率随x和y方向的非对称抛物受限势的受限长度lx和ly和非对称半指数受限势的两个参数的变化关系.通过数值计算分析研究结果表明GaAs非对称半指数量子阱的振动频率是受限势参量U0的增函数,是参量σ的减函数.极化子的振动频率随x和y方向的非对称抛物受限势的受限长度lx和ly的减小而迅速增大,表现出奇特的量子尺寸限制效应.The influence of the confinement lengths lx and ly the asymmetrical parabolic confinement potential of the x-and y-directions on properties of the vibrational frequency of the weak-coupling polaron in a GaAs asym⁃metrical semi-exponential quantum well were studied in this paper.The vibrational frequency of the weak-cou⁃pling polaron in a GaAs asymmetrical semi-exponential quantum well varying with the confinement lengths lx and ly the asymmetrical parabolic confinement potential of the x-and y-directions and the two parameters of the asymmetrical semi-exponential confinement potential is investigated by using linear combination operator and the two unitary transformations methods.The numerical calculated results indicate that the vibrational fre⁃quency of the polaron in a GaAa asymmetrical semi-exponential quantum well are a lifting function of the param⁃eter U0,whereas they are a decaying one of the parameter σ.The vibrational frequency of the polaron increas⁃es with the increasing the confinement lengths lx and ly the asymmetrical parabolic confinement potential of the x-and y-directions.There can be attributed to the interesting quantum size confinement effcts.

关 键 词：非对称半指数量子阱 弱耦合极化子 振动频率 非对称抛物受限势 

分 类 号：O469[理学—凝聚态物理]