Abstract
Coupling of acoustic phonons to an exciton in a single GaN/AlN quantum dot is investigated. Contributions of piezoelectric and deformation-potential couplings on the dot spectral distribution are analyzed separately. We find that, these two types of coupling lead to an important zero-phonon line-degradation but contribute differently on the excitonic line shape. The former involves only low energy phonons but with higher coupling factors leading to the widening of the zero phonon line. The second includes all energy phonons and is therefore responsible for the extension of the lateral phonon wings.
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