Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Quantum Dots, Quantum Wires, Point Contacts

TT 22.1: Vortrag

Dienstag, 17. März 2020, 09:30–09:45, HSZ 201

Cross-correlation spin-noise spectra of interacting quantum dot ensembles — •Andreas Fischer and Frithjof Anders — Theoretische Physik 2, Technische Universität Dortmund, 44227 Dortmund

Two-color pump-probe experiments indicate interactions between the electron spins in ensembles of singly charged InGaAs quantum dot. The interaction strength is comparable to the strength of hyperfine fluctuations but the microscopic origin of the interaction is still unknown. Previously these inter-dot interactions where studied far from thermal equilibrium via periodic optical excitations. We propose the investigation of inter-dot interactions by spin cross-correlation functions accessible in non-invasive two-color spin-noise spectroscopy. For our calculations we use a semiclassical central spin model extended by a Heisenberg interaction between the electron spins. We demonstrate that the cross-correlation function is sensitive to inter-dot interactions and robust in a broad range of frequencies against disorder caused by nuclear quadrupolar interactions, spin-phonon interactions and ensemble inhomogeneities of the electron g-factor.