Polaron Energy and Effective Mass in Parabolic Quantum Wells  

作　　者：王志平 梁希侠 

机构地区：[1]Department of Physics, Inner Mongolia University, Hohhot 010021 [2]CCAST (World Laboratory), PO Box 8730, Beijing 100080

出　　处：《Chinese Physics Letters》2005年第9期2367-2370,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10164003, and the Natural Science Foundation of Inner Mongol of China under Grant No 200408020101.

摘　　要：The energy and effective mass of a polaron in a parabolic quantum well are studied theoretically by using LLP-like transformations and a variational approach. Numerical results are presented for the polaron energy and effective mass in the GaAs/Al0.3Ga0.7As parabolic quantum well. The results show that the energy and the effective mass of the polaron both have their maxima in the finite parabolic quantum well but decrease monotonously in the infinite parabolic quantum well with the increasing well width. It is verified that the bulk longitudinal optical phonon mode approximation is an adequate formulation for the electron-phonon coupling in parabolic quantum well structures.The energy and effective mass of a polaron in a parabolic quantum well are studied theoretically by using LLP-like transformations and a variational approach. Numerical results are presented for the polaron energy and effective mass in the GaAs/Al0.3Ga0.7As parabolic quantum well. The results show that the energy and the effective mass of the polaron both have their maxima in the finite parabolic quantum well but decrease monotonously in the infinite parabolic quantum well with the increasing well width. It is verified that the bulk longitudinal optical phonon mode approximation is an adequate formulation for the electron-phonon coupling in parabolic quantum well structures.

关 键 词：MAGNETIC-FIELDS DONOR IMPURITY 

分 类 号：O572[理学—粒子物理与原子核物理]