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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.83: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Two-color resonant excitation to study the Auger effect in a single photon emitter — •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 quantum phenomena like the Auger effect in a confined nanostructure. We
used two-color, time resolved resonance fluorescence spectroscopy with a high
spectral resolution to record the charge carrier dynamics in a single quantum dot and differentiate between the different recombination paths: Auger, spin-flip and spin-flip Raman recombination [1]. In high-photon-yield, low-dephasing single-photon emitters, the Auger effect should be supressed, because it is an electron-electron scattering effect leading to a non-radiative recombination of, e.g., the charged exciton [2].
We observe an unexpected behaviour of the Auger recombination rate, which
shows an oscillatory behaviour up to 4 Tesla, before decreasing by a factor
of approx. 3 in fields up to 8 Tesla.
For the spin-flip and spin-flip-Raman recombination rates we observe a power dependency for lower magnetic fields around 1 Tesla.
These new findings may be the starting point for
further theoretical and experimental studies to unterstand or even supress this scattering effect.
[1] H. Mannel et al., JAP 134, 154304 (2023).
[2] P. Lochner et al., Nano Lett. 20, 1631-1636 (2020).
Keywords: Self-Assembled; Quantum dot; Auger Recombination Rate; Magnetic Field-Dependence