Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.35: Poster
Dienstag, 10. März 2026, 18:00–20:00, P1
Electrostatic Inter-Layer Coupling Between Self-Assembled Quantum Dot Layers — •Jan Lange1, Lukas Berg1, Laurin Schnorr1, Charlotte Rothfuchs-Engels2, Nikolai Bart2, Severin Krüger2, Sven Scholz2, Arne Ludwig2, Andreas Wieck2, and Thomas Heinzel1 — 1Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität, Bochum, Germany
In this study, transient capacitance spectroscopy is used to examine the coupling between self-assembled quantum dots (SAQDs) - made of InAs in a GaAs heterostructure - in spatially separated layers. 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. Here, also effects caused by the wetting layer are described and included into the model. The findings indicate that the coupling arises from the electrostatic field generated by the charged quantum dots in the adjacent layer as well as charge in a wetting layer, providing a quantitative explanation for the altered electron capture and emission dynamics.
Keywords: DLTS; self-assembled quantum dots; capacitance; interaction