Abstract
The excitonic ground state in single quantum dots with structural anisotropy is studied in dependence on the magnitude of the electron–hole short-range exchange interaction. Structural anisotropy is described phenomenologically by lattice deformation. The fine structure of the exciton levels is due to an interplay of the deformations and exchange interaction and is the more pronounced the smaller the quantum dots are. The lattice deformations are the reason for optical anisotropy in strained quantum dots. The exchange interaction, however, suppresses the polarization effects which are much more significant in large quantum dots. An additional decrease of the optical anisotropy arises from the coexistence of structural and epitaxial deformations.
Published Version
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