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In quantum dots (QDs) the Auger recombination is a non-radiative process,where the electron-hole recombination energy is transferred to an additionalcarrier. It has been studied mostly in colloidal QDs, where the Augerrecombination time is in the ps range and efficiently quenches the lightemission. In self-assembled QDs, on the other hand, the influence of Augerrecombination on the optical properties is in general neglected, assuming thatit is masked by other processes such as spin and charge fluctuations. Here, weuse time-resolved resonance fluorescence to analyze the Auger recombination andits influence on the optical properties of a single self-assembled QD. Fromexcitation-power dependent measurements, we find a long Auger recombinationtime of about 500 ns and a quenching of the trion transition by about 80percent. Furthermore, we observe a broadening of the trion transition linewidthby up to a factor of two. With a model based on rate equations, we are able toidentify the interplay between tunneling and Auger rate as the underlyingmechanism for the reduced intensity and the broadening of the linewidth. Thisdemonstrates that self-assembled QDs can serve as an ideal model system tostudy how the charge recapture process, given by the band-structure surroundingthe confined carriers, influences the Auger process. Our findings are not onlyrelevant for improving the emission properties of colloidal QD-based emittersand dyes, which have recently entered the consumer market. They are also ofinterest for more visionary applications, such as quantum informationtechnologies, based on self-assembled quantum dots.

Auger recombination in self-assembled quantum dots: Quenching and broadening of the charged exciton transition