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HL: Fachverband Halbleiterphysik
HL 79: Quantum dots and wires IV
HL 79.5: Talk
Friday, March 20, 2020, 10:45–11:00, POT 151
Radiative Auger Process in the Single Photon Limit on a Quantum Dot — •Matthias C. Löbl1, Clemens Spinnler1, Alisa Javadi1, Liang Zhai1, Giang N. Nguyen1,2, Julian Ritzmann2, Leonardo Midolo3, Peter Lodahl3, Andreas D. Wieck2, Arne Ludwig2, and Richard J. Warburton1 — 1University of Basel, Switzerland — 2Ruhr-Universität Bochum, Germany — 3Niels Bohr Institute Copenhagen, Denmark
In a quantum dot (QD), an electron can decay by emitting a photon. In a radiative Auger process, the leftover carriers are in an excited state, and a red-shifted photon is created [1]. Here, we report radiative Auger on trions in individual QDs [2]. For the trion, just one electron is left after the optical recombination. The radiative Auger process promotes this electron to a higher shell of the QD; the emitted photon is red-shifted. We show that radiative Auger directly measures the quantization energies of the single electron. Using resonant excitation, we measure the radiative Auger process on two types of charge-tuneable QDs: InGaAs, GaAs QDs [3]. We rigorously prove the radiative Auger mechanism by measuring the photon statistics and the magnetic field dispersion of the emission. We show how quantum optics applied to the Auger photons gives access to the single-electron dynamics, notably relaxation and tunnelling rates. All these properties of radiative Auger can be exploited on other semiconductor nanostructures. [1] T. Åberg et al., Phys. Rev. Lett. 22, 1346-1348 (1969). [2] M. C. Löbl et al., arxiv:1911.11784 (2019) [3] Y. H. Huo et al., Appl. Phys. Lett. 102, 152105 (2013).