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arXiv 1012.2612cond-mat.mtrl-sciquant-ph
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单轴应力下激子极化、精细结构分裂和量子点非对称性

Exciton polarization, fine structure splitting and quantum dot asymmetry under uniaxial stress

Ming Gong, Weiwei Zhang, Guang-Can Guo, Lixin He

摘要:

推导了单轴应力下自组装量子点的精细结构分裂与激子极化角之间的一般关系。结果表明,外应力下的FSS下限可以由激子极化角和零应力下的FSS来预测。临界应力也可以通过监测激子偏振角的变化来确定。我们证实了理论进行原子赝势计算的InAs/GaAs量子点。该工作提供了对量子点不对称性及其光学性质的深入了解,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。

英文摘要:

We derive a general relation between the fine structure splitting (FSS) and the exciton polarization angle of self-assembled quantum dots (QDs) 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 QDs. The work provides a deep insight into the dots asymmetry and their optical properties, and a useful guide in selecting QDs with smallest FSS which are crucial in entangled photon sources applications.

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。

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