  Auger recombination is a non-radiative process, where the recombination
energy of an electron-hole pair is transferred to a third charge carrier. It is
a common effect in colloidal quantum dots that quenches the radiative emission
with an Auger recombination time below nanoseconds. In self-assembled QDs, the
Auger recombination has been observed with a much longer recombination time in
the order of microseconds. Here, we use two-color laser excitation on the
exciton and trion transition in resonance fluorescence on a single
self-assembled quantum dot to monitor in real-time every quantum event of the
Auger process. Full counting statistics on the random telegraph signal give
access to the cumulants and demonstrate the tunability of the Fano factor from
a Poissonian to a sub-Poissonian distribution by Auger-mediated electron
emission from the dot. Therefore, the Auger process can be used to tune
optically the charge carrier occupation of the dot by the incident laser
intensity; independently from the electron tunneling from the reservoir by the
gate voltage. Our findings are not only highly relevant for the understanding
of the Auger process, it also demonstrates the perspective of the Auger effect
for controlling precisely the charge state in a quantum system by optical
means.
