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纤锌矿GaN/AlN抛物量子阱中激子的极化子效应 被引量:3

Polaron Effects of Exciton in Wurtzite GaN/AlN Parabolic Quantum Well
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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.
出处 《内蒙古师范大学学报(自然科学汉文版)》 CAS 北大核心 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)
关键词 纤锌矿氮化物 抛物量子阱 激子 基态能量 结合能 wurtzite nitride parabolic quantum well exciton ground state energy binding energy
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