# Regensburg 2022 – wissenschaftliches Programm

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# HL: Fachverband Halbleiterphysik

## HL 25: Poster 1

### HL 25.59: Poster

### Mittwoch, 7. September 2022, 18:00–20:00, P2

**Auger Recombination Rate: Magnetic Field Dependence in a Self-Assembled Quantum Dot** — •Fabio Rimek^{1}, Hendrik Mannel^{1}, Marcel Zöllner^{1}, Arne Ludwig^{2}, Andreas D. Wieck^{2}, Axel Lorke^{1}, and Martin Geller^{1} — ^{1}Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — ^{2}Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany

A quantum dot (QD) is an ideal system to study electron-electron interaction in a confined nanostructure [1]. The Auger recombination is a special case, where the recombination energy is transferred to a third charge carrier that leaves the dot [2] or is excited to a higher energy level. Therefore, the Auger effect destroys the radiative recombination of the charged exciton (trion) - an effect, which should be minimized for future applications of QDs that use spin states as stationary qubits, which can be transferred to photons via the trion transition.

In this work, we investigate how the Auger rate is affected by an external magnetic field, applied perpendicular to the plane of the dots. In the magnetic field, the trion transition of a QD is no longer spin degenerate and splits up. We use two-color, time-resolved resonance fluorescence to investigate the quenching of the trion recombination by the Auger effect. Two-color excitation allows us to excite two quantum dot transitions and neglect spin relaxation as well as spin-flip Raman scattering. This ensures that we can directly measure the Auger and the tunneling rate of an electron into the dot.

[1] A. Kurzmann et al., Nano Lett. 16, 3367-3372 (2016)

[2] P. Lochner et al., Nano Lett. 20, 1631-1636 (2020)