Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 55: Quantum Dots and Wires: (Single) Photonics
HL 55.5: Talk
Friday, March 13, 2026, 10:30–10:45, POT/0251
Photon-mediated electron capture into a single quantum emitter — •Daniel Oppers1, Hendrik Mannel1, Luca Henrichs1, Fabio Rimek1, Arne Ludwig2, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
Single-photon emitters are one of the key components of quantum information technology. Especially single self-assembled quantum dots in a p-i-n diode structure for charge control are still a promising candidate. We use an InAs/GaAs quantum dot in a bias regime, where the dot is uncharged and drive the exciton transition optically resonant with a cw diode laser. A second off-resonant cw laser with a lower energy than any optical transition is used to induce an internal photoeffect [1], exiting electrons from the electron reservoir in the diode, that are captured into the quantum dot. Consequently, we observe a quenching of the exciton transition, which can no longer be driven resonantly. This electron capture by photo-excitation of electrons from the reservoir (see also [2]) is measured here in real-time, observing every quantum jump from an uncharged to a charged quantum dot in a random telegraph signal. Evaluating the telegraph signal using waiting time distributions we observe a linear increase in the electron capture rate scaling up with increasing excitation power of the off-resonant laser. Our findings reveal that photo-induced quenching is a possible source of exciton dephasing. [1] P. Lochner et. al., Phys. Rev. B 103, 075426 (2021) [2] A. Kurzmann Appl. Phys. Lett. 108, 263108 (2016)
Keywords: Self-assembled Quantum Dots; Resonance fluorescence; Telegraph signal; Single photon emitter; Waiting time distributions