摘要
考虑Ga N/Al N无限抛物量子阱(PQW)中声子模和空穴有效质量的各向异性,利用变分法计算了外电场下氮化物PQW中激子的能量。结果表明,重、轻空穴激子的结合能与基态能均随阱宽的增大而降低;考虑极化子效应时,结合能降低较明显;轻空穴激子的基态能量与结合能比重空穴激子的高;纤锌矿PQW中激子的基态能量比闪锌矿PQW中的低,而纤锌矿PQW中激子的结合能比闪锌矿PQW中的高;有外电场作用时,激子的基态能量与结合能明显降低。
The anisotropy of the effective mass of the hole and optical phonon mode are considered in a GaN/AlN parabolicquantum well(PQW).The ground state energy and binding energy of an exciton in a GaN/AlN PQW in an electric field arecalculated by a LLP variational method.The results show that the ground state energy and binding energy of a heavy-holeexciton or a light-hole exciton in a GaN/AlN PQW decrease when the well width increases;and that the binding energy of anexciton with the effect of polaron are significantly smaller than the results of a bare exciton;and that the ground state energyand binding energy of a heavy-hole exciton are less than the corresponding values of a light-hole exciton.The ground stateenergy of an exciton in wurtzite PQW is less than the results for a Zinc blende PQW whereas the binding energy of anexciton in wurtzite PQW is larger than the result for a Zinc blende PQW.The ground state energy and binding energy of anexciton in an electric field are significantly smaller than the results of an exciton without any electric field.
作者
邢德胜
胡文弢
王顺利
XING De-sheng;HU Wen-tao;WANG Shun-li(Dept. of Computing Science, Jining Normal University;Dept. of Physics, Jining Normal University,Jining 012000)
出处
《集宁师范学院学报》
2017年第3期1-5,13,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"外电场作用下氮化物抛物量子阱中激子性质的研究"(项目编号:NJZY276)
关键词
氮化物
抛物量子阱
激子
基态能量
结合能
Nitride
parabolic quantum well
excitons
ground state energy
binding energy