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HL: Fachverband Halbleiterphysik
HL 18: Quantum dots and wires I
HL 18.2: Vortrag
Montag, 16. März 2020, 15:30–15:45, POT 151
Real-time optical detection of every individual Auger process in a quantum dot — •Hendrik Mannel1, Jens Kerski1, Pia Lochner1, Annika Kurzmann1, Philipp Stegmann1, Jürgen König1, Arne Ludwig2, Andreas D. Wieck2, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
Auger recombination is a non-radiative process, where the recombination energy of an electron-hole pair is transferred to a third charge carrier. In nanostructured materials, it is a common effect especially in colloidal quantum dots, where it quenches the radiative emission with an Auger recombination time below nanoseconds. In self-assembled QDs, the Auger recombination has only been observed recently [1]. We use two-color resonant laser excitation of the exciton and trion transition on a single self-assembled quantum dot with magnetic fields from 4 to 10 Tesla to monitor every quantum event of the Auger process in real-time. With full counting statistics we observe that the Auger process can be used to tune optically the charge carrier occupation of the dot by the incident laser intensity. Independently we can change the charge carrier occupation of the dot with the electron tunneling from the reservoir by the gate voltage. This demonstrates the potential of the Auger effect for controlling precisely the charge state in a quantum system by optical means. [1] A. Kurzmann et al., Nano Lett. 16, 3367 (2016).