Publications

Optically driving the radiative Auger transition

Spinnler, C. and Zhai, L. and Nguyen, G.N. and Ritzmann, J. and Wieck, A.D. and Ludwig, Ar. and Javadi, A. and Reiter, D.E. and Machnikowski, P. and Warburton, R.J. and Löbl, M.C.

NATURE COMMUNICATIONS
Volume: 12 Pages:
DOI: 10.1038/s41467-021-26875-8
Published: 2021

Abstract
In a radiative Auger process, optical decay leaves other carriers in excited states, resulting in weak red-shifted satellite peaks in the emission spectrum. The appearance of radiative Auger in the emission directly leads to the question if the process can be inverted: simultaneous photon absorption and electronic demotion. However, excitation of the radiative Auger transition has not been shown, neither on atoms nor on solid-state quantum emitters. Here, we demonstrate the optical driving of the radiative Auger transition, linking few-body Coulomb interactions and quantum optics. We perform our experiments on a trion in a semiconductor quantum dot, where the radiative Auger and the fundamental transition form a Λ-system. On driving both transitions simultaneously, we observe a reduction of the fluorescence signal by up to 70%. Our results suggest the possibility of turning resonance fluorescence on and off using radiative Auger as well as THz spectroscopy with optics close to the visible regime. © 2021, The Author(s).

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