抽运-探测失谐对InGaAs量子点锁模自旋法拉第旋转和椭圆率信号的影响
Effect of pump-probe detuning on the Faraday rotation and ellipticity signals of mode-locked spins in InGaAs quantum dots
摘要：
利用泵浦-探测光谱研究了单电荷（In，Ga）As/GaAs量子点系综中的法拉第旋转和椭圆率信号。对于简并泵浦和探测，我们观察到法拉第旋转信号的幅度首先随着泵浦和探测之间的时间间隔的增加而增长，然后观察到大的时间间隔的衰减。另一方面，椭圆率信号的时间行为是规则的：其幅度随着分离而衰减。相比之下，对于失谐的泵浦和探测，法拉第旋转和椭圆信号都表现出类似的和常规的行为。实验结果在最近发展的微观理论的框架中得到了很好的描述[Phys.Rev.B80，104436（2009）]。计算和实验数据之间的比较，使我们能够提供洞察电子自旋进动频率的光谱依赖性和提取的电子g因子依赖于能量。
英文摘要：
We have studied the Faraday rotation and ellipticity signals in ensembles of singly-charged (In,Ga)As/GaAs quantum dots by pump-probe spectroscopy. For degenerate pump and probe we observe that the Faraday rotation signal amplitude first grows with increasing the time separation between pump and probe before a decay is observed for large temporal separations. The temporal behavior of the ellipticity signal, on the other hand, is regular: its amplitude decays with the separation. By contrast, for detuned pump and probe the Faraday rotation and ellipticty signals both exhibit similar and conventional behavior. The experimental results are well described in the frame of a recently developed microscopic theory [Phys. Rev. B 80, 104436 (2009)]. The comparison between calculations and experimental data allows us to provide insight into the spectral dependence of the electron spin precession frequencies and extract the electron g-factor dependence on energy.
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。
