Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, People's Republic of China.
Phys Rev Lett. 2011 Jun 3;106(22):227401. doi: 10.1103/PhysRevLett.106.227401. Epub 2011 May 31.
We derive a general relation between the fine-structure splitting (FSS) and the exciton polarization angle of self-assembled quantum dots under uniaxial stress. We show that the FSS lower bound under external stress can be predicted by the exciton polarization angle and FSS under zero stress. The critical stress can also be determined by monitoring the change in exciton polarization angle. We confirm the theory by performing atomistic pseudopotential calculations for the InAs/GaAs quantum dots. The work provides deep insight into the dot asymmetry and their optical properties and a useful guide in selecting quantum dots with the smallest FSS, which are crucial in entangled photon source applications.
我们推导出了在单轴压力下自组装量子点的精细结构分裂（FSS）和激子极化角之间的一般关系。我们表明，外部压力下的 FSS 下限可以由激子极化角和零压力下的 FSS 来预测。通过监测激子极化角的变化，也可以确定临界应力。我们通过对 InAs/GaAs 量子点进行原子赝势计算来验证该理论。这项工作深入了解了量子点的不对称性及其光学性质，并为选择具有最小 FSS 的量子点提供了有用的指导，这在纠缠光子源应用中至关重要。
