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.
Highlights
In a radiative Auger process, optical decay leaves other carriers in excited states, resulting in weak red-shifted satellite peaks in the emission spectrum
We tune the second laser over the Auger transition while measuring just the fluorescence originating from the fundamental transition jsi–jti
For radiative Auger emission, the electronic configuration is left in an excited state, for the phonon sideband, the lattice configuration[34,35]
Summary
In a radiative Auger process, optical decay leaves other carriers in excited states, resulting in weak red-shifted satellite peaks in the emission spectrum. Excitation of the radiative Auger transition has not been shown, neither on atoms nor on solid-state quantum emitters. 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%. 1234567890():,; Non-radiative Auger processes have been observed in both atoms[1] and solid-state quantum emitters[2,3]. They play an important role in determining the efficiency of semiconductor light-emitting diodes and lasers[4]. What appears to be an optical relaxation of one electron in the singleparticle picture involves, a sudden change of the manyparticle configuration
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