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TT: Fachverband Tiefe Temperaturen

TT 20: Quantum Dots and Wires (joint session HL/TT)

TT 20.7: Talk

Thursday, September 30, 2021, 15:30–15:45, H4

Emission and absorption of a radiative Auger transition — •Clemens Spinnler1, Liang Zhai1, Giang N. Nguyen1, Julian Ritzmann2, Andreas D. Wieck2, Arne Ludwig2, Alisa Javadi1, Doris E. Reiter4, Paweł Machnikowski3, Richard J. Warburton1, and Matthias C. Löbl11Department of Physics, University of Basel, Switzerland — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany — 3Department of Theoretical Physics, Wrocław University of Science and Technology, Poland — 4Institut für Festkörpertheorie, Universität Münster, Germany

In multi-electron systems, such as charged semiconductor quantum dots (QD), several electron-hole recombination processes can take place. Besides the well-known resonance fluorescence, Coulomb interactions can lead to radiative Auger processes (shake-up) where part of the recombination energy is transferred to another electron. This Auger electron is left in an excited state and the emitted photon is correspondingly red-shifted.

We report the observation of emission and absorption of a radiative Auger transition from a negatively charged QD. By applying quantum optics techniques to the Auger emission we get insight into single-electron dynamics. We show photon absorption via the radiative Auger transition by driving the QD in a Λ-configuration: while monitoring the resonance fluorescence a second laser is tuned in resonance with the radiative Auger transition. A fluorescence reduction of up to 70% is observed - proving optical driving of the radiative Auger transition.

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