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Computational studies based on 6 band k$\cdot$p theory are employed onlens-shaped III-nitride quantum dots (QDs) with focus on the polarizationproperties of the optical interband transitions. The results predict pronouncedlinear polarization of the ground-state related transitions for asymmetric QDsof a material with small split-off energy. It is demonstrated that a moderateexternally applied electric field can be used to induce a linear polarizationand to control its direction. InN is found to be the most efficient choice fordynamic polarization switching controlled by an electric field, with potentialfor polarization control on a photon-by-photon level.

III-nitride based quantum dots for photon emission with controlled polarization switching