SKM 2021 – scientific programme
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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. Löbl1 — 1Department 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.