纤锌矿GaN/Al_xGa_(1-x)N量子阱中束缚极化子能级  

Energy of Bound Polaron in Wurtzite GaN/Al_xGa_(1-x)N Quantum Well

作　　者：阿荣高娃[1] 赵凤岐[1] 张国庆[1] 张晨宏[1] 桂文龙[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3期291-296,共6页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10964007)

摘　　要：采用Lee-Low-Pines(LLP)中间耦合变分法,研究了GaN/Al0.3Ga0.7N量子阱中束缚极化子基态能量、结合能和电子-声子相互作用对束缚极化子基态能量的贡献随阱宽的变化关系.数值计算中考虑了定域光学声子模和界面光学声子模.计算结果表明,纤锌矿GaN/Al0.3Ga0.7N量子阱中束缚极化子基态能量随着阱宽增大而降低;基态结合能随着阱宽的增大而增大,达到最大值后随阱宽的增大而减小.电子-声子相互作用对束缚极化子基态能量的贡献比较大,对结合能也有影响,使基态能量和结合能降低.纤锌矿结构中电子-声子相互作用对能量的贡献大于闪锌矿结构中的相应值.为了进行对比,计算了闪锌矿GaN/Al0.3Ga0.7N量子阱中束缚极化子的基态能量和结合能.The ground state energy, the ground state binding energy and the effect of the electron-phonon interaction on the energy of bound polaron in wurtzite GaN/Al0.3Ga0.7N quantum well are calculat-ed as functions of well width by using modified Lee-Low-Pines （LLP） variational method in the paper. The influences of confined optical phonon modes and interface optical phonon modes are considered in the calcu-lation. The results show that the ground state energy of bound polaron in GaN/Al0.3Ga0.7N quantum well decreases with increasing well width d, and the ground state binding energy increases to a maximum and then decreases with increasing well width d. The contribution of electron-phonon interaction to the ground state energy of bound polaron is obviously large. The electron-phonon interaction affects the binding ener gy,and it makes the ground state energy and binding energy of bound polaron reduce. In order to compare, the ground state energy,the ground state binding energy and the effect of the electron-phonon interaction on the energy of bound polaron in zinc-blende GaN/Al0.3Ga0.7N quantum well are given.

关 键 词：纤锌矿量子阱 束缚极化子 基态能量 结合能 

分 类 号：O471.1[理学—半导体物理]