DPG Phi
Verhandlungen
Verhandlungen
DPG

SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 24: Quantum dots: Optics

HL 24.12: Vortrag

Mittwoch, 29. März 2023, 12:45–13:00, POT 151

The role of charge transfer for light emission from excitonic complexes in a single quantum emitter — •Marcel Zöllner1, Fabio Rimek1, Hendrik Mannel1, Andreas D. Wieck2, Arne Ludwig2, Martin Geller1, and Axel Lorke11University of Duisburg-Essen, Germany — 2Ruhr-University Bochum, Germany

Due to the non-radiative Auger recombination in self-assembled quantum dots [1], the light emission of the trion X is reduced. However, for devices and statistical analyses, such as random telegraph signals, the amount of quantum dot photons is of great importance.
With time-resolved resonance fluorescence (RF) measurements, we investigate a comparatively small quantum dot, where we can tune the rate of the electron tunneling from the back contact into the quantum dot by increasing the gate voltage. This results in an up to two orders of magnitude higher trion intensity. Due to the large gate voltages (i.e. energetically strongly tilted conduction band) the electrons can easily overcome the tunnel barrier. Thus, the electron tunneling becomes the dominant effect and charges the quantum dot significantly faster than the Auger effect can discharge it.
Our results indicate that thin tunneling barriers, which can quickly equilibrate states in a quantum dot, make its radiative recombination more resilient against spurious charge transfer (Auger, electron capture, internal photoemission). However, this improvement goes along with a short coherence time.
[1] P. Lochner et al., Phys. Rev. B 103, 075426 (2021).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2023 > SKM