Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 15: Quantum Dots and Wires: Growth and Properties
HL 15.5: Vortrag
Dienstag, 18. März 2025, 10:30–10:45, H13
Electrostatic Inter-Layer Coupling between Self-Assembled Quantum Dots — •Jan Lange1, Lukas Berg1, Laurin Schnorr1, Thomas Heinzel1, Charlotte Rothfuchs-Engels2, Nikolai Bart2, Arne Ludwig2, and Andreas Wieck2 — 1Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität, Bochum, Germany
Electrostatic coupling between Self-Assembled Quantum Dots (SAQDs) in spatially separated layers is studied using transient capacitance spectroscopy. The coupling effect is analysed as a function of temperature, applied bias voltage, and the occupancy of the quantum dot layers. The observed interaction is attributed to the electric field modulation induced by charge redistribution in one layer, influencing the capture and emission dynamics in the other. A rate equation model was developed, incorporating self-consistent band bending calculations, to describe the impact of the inter-layer coupling on the charge transfer processes. The findings indicate that the coupling arises from the electrostatic field generated by the charged quantum dots in the adjacent layer, providing a quantitative explanation for the altered capacitance transients.
Keywords: Quantum Dots; Dynamics; DLTS; Capacitance