Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 30: Poster: Quantum dots and wires: Preparation, characterization, optical properties and transport
HL 30.17: Poster
Montag, 31. März 2014, 17:00–20:00, P2
Simulation of Correlation Measurements of Exciton and Trion Recombination in Single Quantum Dots, Coupled to a Two-Dimensional Electron Gas — •Benjamin Merkel1, Annika Kurzmann1, Arne Ludwig2, Andreas D. Wieck2, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CeNIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany — 2Chair of Applied Solid State Physics, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
For optical spectroscopy and coherent exciton state control, self-assembled quantum dots (QDs) are often embedded in a diode structure with a n-doped back contact that allows fast electron tunnelling from the reservoir into the dot states. We use here a different sample structure to investigate the slower electron tunnelling between a single QD and a two-dimensional electron gas and simulate the correlation measurements between the exciton and trion lines.
The occupation of the QD can be controlled with single charge resolution by an applied gate voltage and monitored by measuring the exciton and trion transition line, respectively. However, under non-resonant excitation, different excitonic recombination lines from different charge states can be observed simultaneously in a wide range of gate voltages. We use a model, which describes the capture and escape of QD charges as well as the recombination of exciton states by rate equations. Based on the model, we can simulate correlation measurements of the emitted radiation and are able to reproduce the experimental results.