Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 14: Poster II
HL 14.15: Poster
Monday, March 18, 2024, 15:00–18:00, Poster F
Two-color resonant excitation to study the Auger effect in a single photon emitter — •Nico Schwarz1, F. Rimek1, H. Mannel1, M. Zöllner1, B. Maib1, A. Ludwig2, A. D. Wieck2, A. Lorke1, and M. Geller1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
A quantum dot (QD) as a single photon emitter is an ideal system to study the Auger effect in a confined nanostructure. The recombination energy is transferred to a third charge carrier that leaves the dot [1], hence, the Auger effect destroys the radiative recombination of the negatively charged exciton (trion X−) - an effect, which should be minimized in future optical applications. In order to minimise the Auger recombination, we studied the effect of an applied magnetic field on the Auger recombination [2]. However, in a magnetic field, the trion transition of the QD is no longer spin degenerate, and besides the Auger recombination, the spin-flip and spin-flip Raman transitions make it difficult to determine the Auger rate. Here, we use two-color time-resolved resonance fluorescence measurements with two-color spectral analysis of the emitted single photons from the QD to distinguish between the different state transitions. In this way, spin relaxation and spin-flip Raman scattering can be neglected. This ensures that we can directly measure all important transition and tunneling rates into the quantum dot and get a high accuracy for the influence of the magnetic field on the Auger rate. [1] P. Lochner et al., Nano Lett. 20, 1631-1636 (2020). [2] H. Mannel et al., JAP 134, 154304 (2023).
Keywords: Quantum Dot; Self-Assembled; Auger Recombination Rate; Magnetic Field-Dependence