论文标题
来自单个量子发射极的内部照片效果
Internal Photo Effect from a Single Quantum Emitter
论文作者
论文摘要
我们通过在单个自组装量子点上进行时间分辨的共振荧光测量来证明一种内部光效应，该光效应通过带内激发从点发出电子。我们发现光学生成的排放率对激发强度的线性依赖性，并使用速率方程模型推断涉及速率。通过调节激发强度，可以在几个数量级上调谐发射速率。我们的发现表明，在固态中也可以观察到在单原子光谱法（即照片电离）中众所周知的过程。结果还量化了一种重要但大多数被忽略的机制，该机制可能从根本上限制了固态量子光学设备中的相干时间。
We demonstrate by time-resolved resonance fluorescence measurements on a single self-assembled quantum dot an internal photo-effect that emits electrons from the dot by an intra-band excitation. We find a linear dependence of the optically generated emission rate on the excitation intensity and use a rate equation model to deduce the involved rates. The emission rate is tunable over several orders of magnitude by adjusting the excitation intensity. Our findings show that a process that is well known in single atom spectroscopy (i.e. photo ionization) can also be observed in the solid state. The results also quantify an important, but mostly neglected, mechanism that may fundamentally limit the coherence times in solid-state quantum optical devices.
