ZnO/Mg_xZn_(1-x)O量子阱中的极化子效应  

Effect of Polarons in the ZnO/Mg_xZn_(1-x)O Quantum Well

作　　者：李志强[1] 赵凤岐[1] 姬延明 白金花[1] 月英[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：《河北师范大学学报（自然科学版）》2015年第2期123-127,共5页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(10964007;11264027);内蒙古师范大学"十百千"人才培养基金(RCPY-2-2012-K-039)

摘　　要：通过Lee-Low-Pines(LLP)变分方法研究了纤锌矿ZnO/MgxZn1-xO有限深量子阱中电子与光学声子(定域声子、半空间声子)相互作用对极化子能级的影响,给出了极化子基态能量、跃迁能量和电子-声子相互作用对基态能量的移动随着阱宽和组分的变化关系.结果表明,在窄阱中,对系统能级的移动半空间声子要高于定域声子,而在宽阱中恰好和窄阱中的情况相反.定域(半空间)声子对极化子能级的移动随着阱宽的增大而变大(变小),最后接近体材料的三维值(0).当阱宽不变时,随着Mg组分x的增加,定域声子对极化子能级的移动缓慢增大,而半空间声子对极化子能级的移动则缓慢减小,最后接近于0.Effects of the electron-phonon（confined phonons,half-space phonons）interaction on the energy level in the wurtzite ZnO/MgxZn1-xO quantum wells are investigated by the method of lee-lowpines（LLP）variational.The ground state energy and transition energy of a polaron,and the contribution of the electron-phonon interaction to the energy shift with the well width and composition are given.The results show that the shift of the system energy for the half-space phonons is larger than that for the confined phonons for narrow wells.As for wide wells,the case is opposite.The contribution of confined phonons（half-space phonons）to the energy-level shift increases（It＇s value decreases）with increasing the well width,and finally the energy level approaches to the bulk value（zero）.If we keep the well width unchanged,the shift of the polarons energy level slowly increases with increasing the composition xfor the confined phonon the shift of polaron energy level for the half-space phonon decrease slowly,and finally approaches to zero.

关 键 词：量子阱 电子-声子相互作用 能量 极化子效应 

分 类 号：O471.3[理学—半导体物理]