Abstract
We report on photoluminescence on single GaAs quantum dots. We show that, because the quantum dots have short radiative lifetime, the biexciton line is composed of various contributions originating from the Coulomb interaction with higher energy excitons. This appears as a broad low energy sideband on the biexciton line, that appears whenever the biexciton is observed. A simple model allows us to account for our observations and to show that this sideband is the spectral signature of ultra fast quantum dots in continuous wave measurements.
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