title: Exciton polarization, fine-structure splitting, and the asymmetry of quantum dots under uniaxial stress.
abstract: 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.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, People's Republic of China.
authors.forename: Ming
authors.initials: M
authors.lastname: Gong
authors.forename: Weiwei
authors.initials: W
authors.lastname: Zhang
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo
authors.forename: Lixin
authors.initials: L
authors.lastname: He