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HL: Fachverband Halbleiterphysik
HL 7: Poster I
HL 7.46: Poster
Montag, 27. März 2023, 13:00–15:00, P2/EG
Magnetic Field-Dependence of the Auger Recombination Rate in a Self-Assembled Quantum Dot — •Fabio Rimek1, Hendrik Mannel1, Marcel Zöllner1, Arne Ludwig2, Andreas D. Wieck2, Axel Lorke1, and Martin Geller1 — 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 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 that use spin states as stationary qubits, which can be transferred to photons via the QD 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 due to the Auger effect. Two color excitation allows us to excite two quantum dot transitions (both trions or one trion and one exciton) 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).