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HL: Fachverband Halbleiterphysik
HL 24: Quantum dots: Optics
HL 24.10: Talk
Wednesday, March 29, 2023, 12:15–12:30, POT 151
Size-dependence of the Auger process in self-assembled quantum dots — •Hendrik Mannel1, Marcel Zöllner1, Fabio Rimek1, Arne Ludwig2, Andreas Wieck2, Martin Geller1, and Axel Lorke1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
Auger recombination is a non-radiative process, where the recombination energy of an electron-hole pair is transferred to a third charge carrier. In nanostructured materials, it is a common effect especially in colloidal quantum dots (QD), where short Auger recombination times τAu < 1 ns quench the radiative recombination. In self-assembled QDs, an Auger recombination rate of τAu≈ 1 ms has been observed [1].
We use resonance fluorescence to measure the Auger rate of differently sized self-assembled QDs having exciton recombination energies in the range of 920 to 980 nm [2]. The dots are charged with one electron before driving the trion transition to observe the quenching of this transition time-resolved on the investigated sample structure without a wetting layer.
Independently we can change the charge carrier occupation of the dot by gate voltage-dependent electron tunneling from the reservoir. This is a step to further understand the Auger effect and hopefully supress this unwanted effect in future application of quantum information processing.
[1]*A. Kurzmann et al., Nano Lett. 16, 3367 (2016). [2]*M. Löbl et al., Commun. Phys. 2, 93 (2019).