Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.83: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Frequency Shift of Electronic Resonances in Self Assembled InAs Quantum Dots — •Ibrahim Azad Engin1, Ismail Bölükbasi1, Arn Baudzus1, Patrick Lindner2, Andreas Wieck1, Björn Sothmann3, and Arne Ludwig11Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44801 Bochum — 2Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund — 3Fakultät für Physik, Universität Duisburg-Essen, 47048 Duisburg

Self-assembled InAs quantum dots (SAQD) proved to be promising semiconductor structures for applications as single-photon sources [1]. Especially, charge stabilization by coupling to a reservoir is important for quantum memory resources [2].

In this contribution, we investigate InAs SAQDs in a diode structure coupled to an electron reservoir by capacitance-voltage-spectroscopy to electrically probe QD energy levels and vary parameters like ac-frequency and bath temperature. For the lowest energy s-states a thermal shift in equilibrium has been reported [3]. Non-equilibrium coupling has been observed and described with a master equation [4], where resonance shifts at higher frequencies and temperature remain unexplored. We rectify this here by proposing a more elaborated model and experimental data interpretation.

[1] Tomm, N. et al., Nat. Nanotechnol. 16, 399-403 (2021). [2] Prechtel, J. et al., Nat. Mater. 15, 981-986 (2016) [3] Brinks, F. et al., New J. Phys. 18, 123019 (2016). [4] Valentin, S. et al., Phys. Rev. B 97, 045416 (2018).

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