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SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 15: Spin phenomena in semiconductors

HL 15.4: Talk

Tuesday, March 28, 2023, 10:15–10:30, POT 251

Microscopic origin of the effective spin-spin interaction in a semiconductor quantum dot ensembleFredrik Vonhoff1,2, Andreas Fischer1, •Kira Deltenre1, and Frithjof B. Anders11Department of Physics, TU Dortmund University, D-44227 Dortmund — 2Department of Physics, Technical University of Munich, D-85748 Garching

We present a microscopic model for a singly charged quantum dot (QD) ensemble to reveal the origin of the long-range effective interaction between the electron spins in the QDs. Wilson’s numerical renormalization group (NRG) is used to calculate the magnitude and the spatial dependency of the RKKY interaction mediated by the growth-induced wetting layer.

Using the NRG results obtained from realistic parameters as input for a semiclassical simulation for a large QD ensemble, we demonstrate that the experimentally reported phase shifts in the coherent spin dynamics between single and two-color laser pumping can be reproduced by our model [1], solving a longstanding open problem of the microscopic origin of the inter-QD electron spin-spin interaction.

[1] F. Vonhoff, A. Fischer, K. Deltenre, and F. B. Anders, Phys. Rev. Lett. 129, 167701 (2022)

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