Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 25: Poster 1
HL 25.58: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P2
Energy dependent tunnel coupling of QDs to a reservoir at elevated temperatures — •Ismail Bölükbasi1, Ibrahim Engin1, Patrick Lindner2, Arn Baudzus1, Andreas D. Wieck1, Björn Sothmann3, and Arne Ludwig1 — 1Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2TU Dortmund, D-44221, Dortmund, Germany — 3Theoretische Physik, Universität Duisburg-Essen and CENIDE, D-47048 Duisburg, Germany
Quantum dots have interesting physical properties and allow research in zero dimensional systems. They are used in modern displays and are highly efficient sources of high-fidelity single photons . For their applicability, it is advantageous to understand the electrical properties and tunnelling behaviours of QDs coupled to a charge reservoir. Capacitance-voltage spectroscopy is used to characterize quantum dots by electronically accessing the quantized states. A resonance shift with temperature in the ground-state charging peaks, the s-type states  originates from the degeneracy of the one- and two electron quantum states. An approach to model these measurements with a master equation  can describe these shifts including excitonic and non-equilibrium states. It is however limited to constant tunnel-coupling. We present experimental observations like frequency dependent peak shifts that need an extended model and propose an improved master equation approach to address this behaviour.
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