量子点电子-空穴复合动力学中载流子关联的系统研究
Systematic study of carrier correlations in the electron-hole recombination dynamics of quantum dots
摘要：
利用时间分辨光致发光和透射光谱研究了自组装（In，Ga）As/GaAs量子点中的基态载流子动力学。通过改变点的设计方面的限制和掺杂，动态显示遵循一般的非指数衰减。例如，仅对于关于光激发和载流子布居的特定条件，衰减可以由单指数形式很好地描述。对于基态跃迁的共振激发，观察到的发光衰减时间的强烈缩短相比，非共振的情况下。结果与微观理论一致，该理论解释了与简单两级图像的偏差。
英文摘要：
The ground state carrier dynamics in self-assembled (In,Ga)As/GaAs quantum dots has been studied using time-resolved photoluminescence and transmission. By varying the dot design with respect to confinement and doping, the dynamics is shown to follow in general a non-exponential decay. Only for specific conditions in regard to optical excitation and carrier population, for example, the decay can be well described by a mono-exponential form. For resonant excitation of the ground state transition a strong shortening of the luminescence decay time is observed as compared to the non-resonant case. The results are consistent with a microscopic theory that accounts for deviations from a simple two-level picture.
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