摘要
考虑到纤锌矿氮化物抛物量子阱(PQW)材料中空穴有效质量和光学声子模的各向异性、声子频率随波矢变化的效应,作者利用LLP变分法研究了纤锌矿抛物量子阱中激子的能级。结果表明: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;抛物量子阱中激子的基态能量和结合能随量子阱宽度和Al组分变化的规律和方量子阱中是一致的。
In consideration of the effective mass of an electron hole,the anisotropy of optical phonon modules and the effect of the frequency of phonons changing with the band vectors in a GaN/AlxGal-xN parabolic quantum well (PQW) of wurtzite, a Lee-Low-Pines (LLP)variational method is used to calculate the energy level of an exciton in a PQW of wurtzite. The results show that the ground state energy and the binding energy of a heavy-hole exeiton is less than the corresponding value of a light-hole exciton,and that the law that the ground state energy and the binding energy of an exciton of a parabolic quantum well change with the width of the well and the Al- components are consistent with the law in a square quantum well.
出处
《集宁师范学院学报》
2013年第3期109-114,共6页
Journal of Jining Normal University
基金
内蒙古自治区高等学校科学研究项目"纤锌矿氮化物抛物量子阱中激子特性的研究"(项目编号:NJZY11288)
关键词
纤锌矿氮化物
抛物量子阱
激子
基态能量
结合能
nitride of wurtzite
parabolic quantum wells
excitons
ground state energy
binding energy