Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.44: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Effect of an RKKY interaction between electron spins in different quantum dots on their spin dynamics — •Kira Deltenre and Frithjof Anders — Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44227 Dortmund

Two-colored pump-probe experiments on self-assembled InGaAs quantum dots with spectrally narrow pump pulses allow to excite disjunct subsets of quantum dots. The observed correlations between the spin polarizations of the subsets suggest an interaction between the electron spins in the different quantum dots (Spatzek et al., Phys. Rev. Lett. 107, 137402 (2011)). The observed phase shift between the measured ellipticities depends on the time delay between the two differently colored pump pulses. For our simulation, we assume an RKKY interaction transmitted via the wetting layer of the sample. The calculations of the spin dynamics are based on the central spin model. A semiclassical approach enables a simulation of a large number of quantum dots (Q > 1000). The extracted time dependent phase shifts are qualitatively similar to the experimental data for a specific set of parameters entering the distance dependent RKKY interaction strength.