期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
ZnO/MgxZn1-xO量子阱中的极化子效应
- 内蒙古师范大学 物理与电子信息学院, 内蒙古 呼和浩特 010022
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DOI：10.13763/j.cnki.jhebnu.nse.2015.02.006
Effect of Polarons in the ZnO/MgxZn1-xO Quantum Well
摘要/Abstract
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-low-pines (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 x for the confined phonon the shift of polaron energy level for the half-space phonon decrease slowly,and finally approaches to zero.
关键词
参考文献 22
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