Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 8: Quantum Dots and Wires 2: Optics 1
HL 8.9: Vortrag
Montag, 5. September 2022, 17:45–18:00, H32
Bandwidth Limit in Optically Detected Single Electron Tunneling Events — •Jens Kerski1, Hendrik Mannel1, Pia Lochner1, Eric Kleinherbers1, Annika Kurzmann2, Arne Ludwig3, Andreas D. Wieck3, Jürgen König1, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 22nd Institute of Physics, RWTH Aachen University, Germany — 3Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
Measurements of single quantum processes have recently attracted increasing attention. One example is the counting of single electron tunnel events in quantum dots. These individual quantum jumps are usually measured electrostatically. However, new optical detection methods have been developed that promise higher time resolution, although their potential has not yet been fully investigated. Here, we study the resonance fluorescence of the excitonic transition from a self-assembled quantum dot embedded in a tailored diode structure.
We detect the optical signal with single photon resolution and use a post-processing procedure to identify the optimal bandwidth for the analysis of our data. We demonstrate that we can evaluate our data with up to 175 kHz bandwidth and show how the chosen bandwidth affects the determined tunneling rates and the evaluation by full counting statistics. Using a simple model, we discuss how the Poisson distribution of the photons limits the time resolution even in ideal measurements and propose how a time resolution of more than 1 MHz could be achieved.