论文标题
结构性对称性的破坏以解释自组装量子点中的辐射螺旋钻过渡
Structural symmetry-breaking to explain radiative Auger transitions in self-assembled quantum dots
论文作者
论文摘要
量子点的光谱通常由最低能量构型之间的基本过渡主导。但是，辐射螺旋钻过程可能会导致额外的红移发射线。这些线的起源是量子点中库仑相互作用和对称性破坏的组合。在本文中，我们介绍了此类辐射螺旋线的测量值，用于一系列INGAAS/GAAS自组装量子点，并使用具有构型相互作用方法的紧密结合模型来解释其外观。在DOT中引入组成波动群集，我们的计算与测量值非常吻合。我们将发现与群体理论相关联，解释了其他发射线的起源。我们的模型和结果可以深入了解量子点中对称性破裂与辐射螺旋线线的位置和强度之间的相互作用。
The optical spectrum of a quantum dot is typically dominated by the fundamental transition between the lowest-energy configurations. However, the radiative Auger process can result in additional red-shifted emission lines. The origin of these lines is a combination of Coulomb interaction and symmetry-breaking in the quantum dot. In this paper, we present measurements of such radiative Auger lines for a range of InGaAs/GaAs self-assembled quantum dots and use a tight-binding model with a configuration interaction approach to explain their appearance. Introducing a composition fluctuation cluster in the dot, our calculations show excellent agreement with measurements. We relate our findings to group theory explaining the origin of the additional emission lines. Our model and results give insight into the interplay between the symmetry breaking in a quantum dot and the position and strength of the radiative Auger lines.
