arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0709.2627cond-mat.mes-hall
收藏

I型和II型非圆形半导体纳米环:激子Aharonov-Bohm效应中的发射动力学

Non-circular semiconductor nanorings of type I and II: Emission kinetics in the exciton Aharonov-Bohm effect

Michal Grochol, Roland Zimmermann

摘要:

研究了I型和II型半导体纳米环中激子的跃迁能和振子强度随磁场的变化。与II型纳米环的圆形(同心)形状的轻微偏离给出了Aharonov-Bohm振荡的更好的可观察性,因为基态总是光学活性的。动力学方程的激子占领解决声学声子散射作为主要的弛豫过程,和吸收和发光光谱计算显示偏离平衡。非辐射激子衰减的存在导致了与磁场的集成光致发光的淬灭。

英文摘要:

Transition energies and oscillator strengths of excitons in dependence on magnetic field are investigated in type I and II semiconductor nanorings. A slight deviation from circular (concentric) shape of the type II nanoring gives a better observability of the Aharonov-Bohm oscillations since the ground state is always optically active. Kinetic equations for the exciton occupation are solved with acoustic phonon scattering as the major relaxation process, and absorption and luminescence spectra are calculated showing deviations from equilibrium. The presence of a non-radiative exciton decay leads to a quenching of the integrated photoluminescence with magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑