We have observed a direct correlation between nonspherical shape and polarization anisotropy of optical transitions in quantum dots. The dots, grown by self-assembling during epitaxial deposition of InAs on GaAs(311)A, exhibit a nonconventional, faceted, arrowheadlike shape aligned in the [2{}33] direction. The dot photoluminescence emission is partially (≈13%) polarized along the same [2{}33] direction. The presence and the sign of the emission polarization is in agreement with the predictions of a theoretical model. Full morphological and optical characterization is reported.
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Henini et al. (1998) studied this question.
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