Strong optical anisotropy is observed in the photoluminescence (PL) bands of both the InP self-assembled quantum dots and the Ga0.5In0.5P matrix. From the linearly polarized PL spectra measured under weak excitation, we found that large size quantum dots show strong anisotropy. The luminescence from a single quantum dot observed by the micro-PL technique revealed a doublet fine structure of the exciton levels that obey the linear polarization selection rule. The observed fine structure is shown to arise from an interplay of the electron-hole exchange interaction and the asymmetric crystal structure of the InP/Ga0.5In0.5P system.
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Sugisaki et al. (1999) studied this question.
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