非对称半指数量子阱中强耦合极化子的基态结合能  

Ground State Binding Energy of the Strong-coupling Polaron in Asymmetrical Semi-exponential Quantum Wells

作　　者：梅景红[1] 肖景林[1] 邱伟[1] MEI Jing-hong;XIAO Jing-Lin;QIU Wei(Institute of Condensed Matter Physics»Inner Mongolia University For Nationalities,ongliao 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：《量子光学学报》2020年第4期392-396,共5页Journal of Quantum Optics

基　　金：国家自然科学基金(11464033);内蒙古民族大学科学研究基金(NMDYB18021)。

摘　　要：采用Huybrechts线性组合算符和第二次Lee-Low-Pines(LLP)幺正变换的方法,从理论上研究了氯化铷非对称半指数量子阱中强耦合极化子的性质,推导出了强耦合极化子的基态结合能和平均声子数。选择半指数氯化铷晶体,讨论了非对称半指数量子阱中强耦合极化子的基态结合能和平均声子数随非对称半指数受限势两个参量的函数关系。结果表明:基态结合能Eb是量子阱受限势参量U0的减函数,是参量σ的增函数;平均声子数是量子阱受限势参量U0的增函数,是参量σ的减函数。发现两个参量是研究非对称半指数量子阱中极化子性质的重要物理量。By using Huybrechts’linear combination operator and the method of second Lee-Low-Pines(LLP)unitary transformation method,we studied the properties of the strong-coupling polaron in RbCl asymmetrical semi-exponential quantum wells.The ground state binding energy and mean phononnumber of the strong-coupling polaron are theoretically derived.Taking the RbCl semi-exponential quantum well crystal as an example,we discussed the ground state binding energy and mean phonon number of strong-coupling polaron in asymmetrical semi-exponential quantum wells,which changes with the strength of two parameters of the semi-exponential confinement potential.And it indicates that the ground state binding energy of the strong-coupling polaron is a decaying function of the parameter U0,whereas it is a lifting one of the parameterσ;the mean phonon number of the strong-coupling polaron is a lifting function of the parameter U0,whereas it is a decaying one of the parameterσ.We find that the two positive parameters are important physical quantities for investigating the properties of the asymmetrical semi-exponential quantum well.

关 键 词：非对称半指数量子阱 强耦合 极化子 线性组合算符 基态结合能 

分 类 号：O469[理学—凝聚态物理]