纤锌矿GaN/AlN抛物量子阱中激子的极化子效应  

Polaron Effects of Exciton in Wurtzite GaN/AlN Parabolic Quantum Well

作　　者：邢德胜[1] 赵凤岐[2] 

机构地区：[1]集宁师范学院计算机系,内蒙古集宁012000 [2]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4期431-436,共6页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：内蒙古自治区高等学校科学研究项目(NJZY11288)

摘　　要：考虑纤锌矿GaN和AlN构成的抛物量子阱(PQW)材料中空穴有效质量和光学声子模的各向异性,以及声子频率随波矢变化的效应,采用LLP变分法计算了纤锌矿GaN/AlN PQW中激子的能量.结果表明,纤锌矿PQW中轻、重空穴激子的基态能量和结合能随着阱宽的增大而降低;考虑极化子效应时,激子的结合能明显降低.轻空穴激子的基态能量和结合能高于重空穴激子的相应值;纤锌矿PQW中激子的基态能量低于闪锌矿PQW中的基态能量,而纤锌矿PQW中激子的结合能高于闪锌矿PQW中的结合能.The anisotropies of the band mass of holes and the optical phonon mode,and the effect of phonon frequency changing with vector are considered in a wurtzite GaN /AlN parabolic quantum well(PQW).The ground state energy and the binding energy of an exciton in a wurtzite GaN /AlN PQW are calculated by a LLP variational method.The results show that the ground state energy and the binding energy of a heavy-hole exciton or a light-hole exciton in a wurtzite GaN/AlN PQW decreases when the well width increases.The binding energy of an exciton with the effect of polaron are significantly smaller than the results of a bare exciton.The ground state energy and the binding energy of a heavy-hole exciton are less than the corresponding values of a light-hole exciton.The ground state energy of an exciton in wurtzite PQW is less than the results for a Zinc blende PQW.The binding energy of an exciton in wurtzite PQW is larger than the results for a Zinc blende PQW.

关 键 词：纤锌矿氮化物 抛物量子阱 激子 基态能量 结合能 

分 类 号：O471.3[理学—半导体物理]