Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 8: Quantum Dots and Wires 2: Optics 1
HL 8.5: Vortrag
Montag, 5. September 2022, 16:15–16:30, H32
Photoneutralization of charges in GaAs quantum dot based entangled photon emitters — Jingzhong Yang1, Tom Fandrich1, •Frederik Benthin1, Robert Keil2, Nand Lal Sharma2, Weijie Nie2, Caspar Hopfmann2, Oliver G. Schmidt2,3,4, Michael Zopf1, and Fei Ding1,5 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Germany — 2Institute for Integrative Nanosciences, Leibniz IFW Dresden, Germany — 3Material Systems for Nanoelectronics, Technische Universität Chemnitz, Germany — 4Nanophysics, Faculty of Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, Germany — 5Laboratorium für Nano- und Quantenengineering, Leibniz Universität Hannover, Germany
Semiconductor-based quantum dot emitters are an attractive source for generating pairwise photonic entanglement and a promising constituent of photonic quantum technologies. However, quantum dots typically suffer from luminescence blinking, lowering the efficiency of the source and hampering their scalable application in quantum networks. We investigate the spectral and quantum optical response of the quantum dot emission by introducing an additional wavelength tunable gate laser. Under two-photon resonant excitation of the neutral biexciton in a GaAs/AlGaAs quantum dot, the blinking of the neutral exciton emission was observed. Our finding demonstrates that the emission blinking can be actively suppressed by controlling the balance of free electrons and holes in the vicinity of the quantum dot thereby significantly increasing the quantum efficiency by 30%.