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The optical spectrum of a quantum dot is typically dominated by thefundamental transition between the lowest-energy configurations. However, theradiative Auger process can result in additional red-shifted emission lines.The origin of these lines is a combination of Coulomb interaction andsymmetry-breaking in the quantum dot. In this paper, we present measurements ofsuch radiative Auger lines for a range of InGaAs/GaAs self-assembled quantumdots and use a tight-binding model with a configuration interaction approach toexplain their appearance. Introducing a composition fluctuation cluster in thedot, our calculations show excellent agreement with measurements. We relate ourfindings to group theory explaining the origin of the additional emissionlines. Our model and results give insight into the interplay between thesymmetry breaking in a quantum dot and the position and strength of theradiative Auger lines.

Structural symmetry-breaking to explain radiative Auger transitions in self-assembled quantum dots