SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 8: Poster Session II
HL 8.25: Poster
Tuesday, September 28, 2021, 10:00–13:00, P
Magnetic Field Dependence of the Auger Recombination Rate in a Self-Assembled Quantum Dot — •Fabio Rimek1, Hendrik Mannel1, Marcel Ney1, Arne Ludwig2, Andreas D. Wieck2, Martin Geller1, and Axel Lorke1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2Chair 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 third charge carrier that leaves the dot or is excited to an higher energy level. Therefore the Auger effect destroys the radiative trion transition - an effect, which should be minimized for future applications of QDs using the spin states as stationary qubit that should be transferred to a photon via this trion transition.
**In this work, we investigate how the Auger rate is affected by an external magnetic field, applied along the growth direction of the sample. In the magnetic field, the trion state of a QD is no longer spin degenerate and splits up. We use two-color, time-resolved resonance fluorescence spectroscopy to investigate the quenching of the trion recombination by the Auger effect. Two-color excitation allows us to symmetrically excite both trion resonances and thus neglect spin relaxation as well as spin-flip Raman scattering. We observe a suppression of the Auger recombination by almost a factor of three, when increasing the field up to B = 10T.
**[1] A. Kurzmann et al., Nano Lett. 16, 3367-3372 (2016)