Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: Quantum Dots and Wires 3: Growth
HL 12.10: Vortrag
Dienstag, 6. September 2022, 12:30–12:45, H32
Surface quantum dots with pure, coherent, and blinking-free single photon emission — •Michael Zopf1, Xin Cao1, Jingzhong Yang1, Pengji Li1, Tom Fandrich1, Eddy P. Rugeramigabo1, Chenxi Ma1, Robert Keil2, Frederik Benthin1, Benedikt Brechtken1, Rolf J. Haug1,4, Yiteng Zhang1, Susanne Woche3, Zhao An1, Constantin Schmidt1, and Fei Ding1,4 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Germany — 2Fraunhofer-institut für Angewandte Festkörperphysik IAF, Freiburg, Germany — 3Institut für Bodenkunde, Leibniz Universität Hannover, Germany — 4Laboratorium für Nano- und Quantenengineering, Leibniz Universität Hannover, Germany
The surface of semiconductor micro- and nanostructure-based devices has a major impact on their performance. Disorder and defects in the crystal typically lead to electronic states in the bandgap, degrading charge carrier transport and radiative recombination. In next generation semiconductor devices such as single or entangled photon sources, surface effects lead to low efficiency, photon dephasing, blinking or spectral jittering. Here we show unprecedented optical quality of GaAs quantum dots that are grown directly on an AlGaAs surface and passivated with 1-Octadecanethiol. Single photons are generated with 98.8 % purity, 78 % indistinguishability and narrow linewidths down to 7 µeV, close to the radiative limit. The emission is unaffected by the surface and shows no blinking over more than 12 orders of magnitude in time, yielding an on-fraction of 99.7 %. These results are likely to stimulate new fundamental studies and quantum applications.