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Nonclassical radiation from a single quantum dot

机译:来自单个量子点的非经典辐射

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We report the experimental observation of photon antibunching in the photoluminescence of a chemically synthesized CdSe/ZnS quantum dot (OD) at room temperature and from a single self-assembled InAs/GaAs QD at 4 K. These results prove that a single quantum dot acts like an artificial atom, with a discrete anharmonic spectrum. Using the quantum regression theorem, we find that the normalized second-order correlation function g((2))(tau) can be described by a single exponential function in the weak-laser excitation regime. From this model we derive that the time constant of the photon antibunching signal is determined by the effective incoherent pump and recombination rates of the nonresonant optically pumped QD. [References: 24]
机译:我们报告了在室温下化学合成的CdSe / ZnS量子点(OD)的光致发光中的光子反聚束的实验观察,以及在4 K下从单个自组装的InAs / GaAs QD的光致发光。这些结果证明了单个量子点的作用像人造原子,具有不连续的非谐谱。使用量子回归定理,我们发现归一化的二阶相关函数g((2))(tau)可以由弱激光激发态中的单个指数函数来描述。从这个模型中我们可以得出,光子反聚束信号的时间常数是由有效的非相干泵浦和非谐振的光泵浦QD的复合率决定的。 [参考:24]

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