Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 55: Quantum Dots and Wires: (Single) Photonics
HL 55.6: Talk
Friday, March 13, 2026, 10:45–11:00, POT/0251
Influence of the internal photoelectric effect on the indistinguishability of single quantum dot photons — •Luca Henrichs1, Fabio Rimek1, Hendrik Mannel1, Daniel Oppers1, Arne Ludwig2, Martin Geller1, and Axel Lorke1 — 1Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
A single self-assembled quantum dot (QD) is one of the promising candidates as a bright (high photon rate) and stable (Fourier-limited) linewidth single photon source [1]. For applications in photonic devices or in quantum communication networks the dephasing process is an important property, where besides spin- and charge noise, the Auger-Meitner [2] and the photoeffect [3] could play an important role.
Here, we investigate the impact of the internal photoelectric effect on the indistinguishability of single QD photons. We used pulsed Hong-Ou-Mandel measurements at different excitation intensities of the exciton transition to determine the photon indistinguishability in various driving regimes, ranging from coherent scattering (the Heitler regime) to the incoherent regime above the saturation intensity. Above saturation, we observe the influence of the photoeffect, which reduces the indistinguishability. Our findings represent an important step toward understanding the decoherence of single photons in this important quantum system.
[1] N. Tomm et al., Nat. N. 16, 399*403 (2021). [2] H. Mannel et al., AIP, 15, 134 (2023). [3] P. Lochner et al, PR, 7, 103, (2021).
Keywords: Quantum Dot; Self-Assembled; internal photoelectric effect; indistinguishability