A Fractional-Dimension Variational Approach for the Bound Polaron in Parabolic Quantum Wells  

抛物量子阱中的束缚极化子:分维变分方法(英文)

作　　者：邢雁[1] 王志平[1] 梁希侠[1] 

机构地区：[1]内蒙古大学理工学院,呼和浩特010021

出　　处：《Journal of Semiconductors》2008年第5期841-844,共4页半导体学报（英文版）

基　　金：国家自然科学基金(批准号:10764003);内蒙古自然科学基金(批准号:200607010105)资助项目~~

摘　　要：The binding energy of a bound polaron in a finite parabolic quantum well is studied theoretically by a fractional- dimensional variational method. The numerical results for the binding energies of the bound polaron and longitudinal-optical phonon contributions in GaAs/Al0.3 Ga0.7 AS parabolic quantum well structures are obtained as functions of the well width. It is shown that the binding energies of the bound polaron are obviously reduced by the electron-phonon interaction and the phonon contribution is observable and cannot be neglected.采用分维变分方法讨论了有限深抛物量子阱中束缚极化子的束缚能,得到了束缚能随阱宽的变化关系,并给出了声子对束缚能的贡献随阱宽的变化曲线.数值计算的结果表明,束缚极化子的束缚能随阱宽的增大存在一极大值,电子-声子的相互作用使束缚极化子的束缚能显著降低,声子的贡献不可忽略.

关 键 词：bound polaron binding energy parabolic quantum well 

分 类 号：TN304[电子电信—物理电子学]