Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 42: Quantum Dots and Wires: Optics I
HL 42.3: Talk
Wednesday, March 19, 2025, 17:30–17:45, H17
Magnetic field dependence of the Auger recombination rate in a single quantum dot — •Nico Schwarz1, Fabio Rimek1, Hendrik Mannel1, Marcel Zöllner1, Britta Maib1, 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
In solid state physics, the quantum dot (QD) as a single photon emitter is an ideal system to study the Auger effect in a confined nanostructure. The Auger effect is an electron-electron scattering effect in which the energy of the electron-hole recombination is transferred to a third carrier, leading to a non- radiative recombination of, e.g., the trion [1]. This Auger recombination should be suppressed in high-photon-yield, low-dephasing single-photon emitters. We used two-color, time resolved resonance fluorescence spectroscopy with a high spectral resolution on a single quantum dot to differentiate between the differ- ent recombination paths: Auger, spin-flip and spin-flip Raman recombination [2]. We observe an unexpected behaviour of the Auger recombination rate, which shows a decrease from B = 0 to 2 T, followed by an increase to 4 T , before decreasing again by a factor of approx. three up to 8 T. These new findings may be the starting point for further theoretical and experimental studies to unterstand or even supress this scattering effect, in which the environment seems to play an important role. [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