纤锌矿ZnO/Mg_xZn_(1-x)O量子阱中的极化子效应  

Effect of Polaron in Wurtzite ZnO/Mg_xZn_(1-x)O Quantum Well

作　　者：张国庆[1] 赵凤岐[1] 李志强[1] 

机构地区：[1]内蒙古师范大学物理与电子信息学院,内蒙古呼和浩特010022

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2013年第5期527-531,共5页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11264027);内蒙古师范大学"十百千"人才培养基金项目(RCPY-2-2012-K-039);内蒙古自治区2013年硕士研究生科研创新项目(S20131013502)

摘　　要：采用Lee-Low-Pines(LLP)变分法,研究了纤锌矿ZnO/Mgx Zn1-x O量子阱中自由极化子能量和电子-声子相互作用对极化子能量的影响,给出极化子基态能量、跃迁能量,以及电子-声子相互作用对基态能量的贡献随阱宽和组分的变化关系.结果显示,极化子基态能量和跃迁能量随着量子阱宽度的增大而减小,最后趋近于ZnO体材料的三维值.在窄阱中,界面声子对极化子能量的贡献大于定域声子的贡献,而在宽阱中,情况正好相反.纤锌矿ZnO/Mgx Zn1-x O量子阱中电子-声子相互作用对极化子能量的贡献比较大,远大于GaAs/AIx Ga1-x As量子阱中的相应值,因此讨论电子态能级问题时应考虑电子-声子相互作用.Energy of polaron and effects of the electron-phonon interaction to the energy in wurtzite ZnO/MgxZn1-xO quantum well are investigated by using modified Lee-Low-Pines （LLP） variational method. The function of the ground state energy, transition energy of polaron,and the contribution of the electron-phone interaction to the energy with the well width and composition are given. The results show that the ground state energy and transition energy of polaron in ZnO/Mg^Znl_~O quantum well decreases with increasing well width,and finally approaches to the bulk value of ZnO. The contributions of the inter- face modes to polaron energy are larger than that of the contribution of the confined phonon modes for narrow well, but the case is contrary for width wells. The contribution of electron-phone interaction to the energy of polaron in wurtzite ZnO/MgxZn1-x0 quantum well structure is very large, the value is much larger than that of GaAs/AIxGa1-xAs quantum well structure, so it should be considered when the problem of election state is discussed in this structure.

关 键 词：纤锌矿ZnO量子阱 电子—声子相互作用 极化子效应 极化子能量 

分 类 号：O471.3[理学—半导体物理]