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研究了InGaAs/GaAs量子链的稳态和瞬态光谱特性,特别是载流子的动力学过程.实验发现荧光寿命有很强的探测能量依赖关系,荧光寿命随发光能量的增加而减小;实验还发现,当激发功率较小时,荧光寿命随激发功率增大而增大,当激发功率足够大时,荧光寿命趋于饱和.这些结果清楚地表明,在量子链结构中,参与发光的载流子之间存在明显的耦合和输运现象,进一步分析表明,这种输运主要是由于载流子沿量子链方向的耦合造成的.发光的偏振特性研究进一步证实了载流子沿量子链方向输运过程.
The steady-state and transient spectral properties of InGaAs / GaAs quantum chains, especially the carrier dynamics, have been studied.The experimental results show that the fluorescence lifetime has a strong dependence on the detection energy, and the fluorescence lifetime decreases with the increase of the luminescence energy. The experiment also found that when the excitation power is small, the fluorescence lifetime increases with the excitation power, and when the excitation power is large enough, the fluorescence lifetime tends to be saturated.These results clearly show that in the quantum chain structure, There are obvious coupling and transport phenomena between the carriers, and further analysis shows that this transport is mainly due to the coupling of carriers along the direction of the quantum chain. The study of the polarization characteristics of the light emission further confirms that the carrier along the quantum chain Direction of transport process.