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• W2299734524 abstract "In quantum dots (QDs) the Auger recombination is a non-radiative process, where the electron-hole recombination energy is transferred to an additional carrier. It has been studied mostly in colloidal QDs, where the Auger recombination time is in the ps range and efficiently quenches the light emission. In self-assembled QDs, on the other hand, the influence of Auger recombination on the optical properties is in general neglected, assuming that it is masked by other processes such as spin and charge fluctuations. Here, we use time-resolved resonance fluorescence to analyze the Auger recombination and its influence on the optical properties of a single self-assembled QD. From excitation-power dependent measurements, we find a long Auger recombination time of about 500 ns and a quenching of the trion transition by about 80 percent. Furthermore, we observe a broadening of the trion transition linewidth by up to a factor of two. With a model based on rate equations, we are able to identify the interplay between tunneling and Auger rate as the underlying mechanism for the reduced intensity and the broadening of the linewidth. This demonstrates that self-assembled QDs can serve as an ideal model system to study how the charge recapture process, given by the band-structure surrounding the confined carriers, influences the Auger process. Our findings are not only relevant for improving the emission properties of colloidal QD-based emitters and dyes, which have recently entered the consumer market. They are also of interest for more visionary applications, such as quantum information technologies, based on self-assembled quantum dots." @default.
• W2299734524 created "2016-06-24" @default.
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• W2299734524 date "2016-04-21" @default.
• W2299734524 modified "2023-09-26" @default.
• W2299734524 title "Auger Recombination in Self-Assembled Quantum Dots: Quenching and Broadening of the Charged Exciton Transition" @default.
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• W2299734524 doi "https://doi.org/10.1021/acs.nanolett.6b01082" @default.
• W2299734524 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27087053" @default.
• W2299734524 hasPublicationYear "2016" @default.
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