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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Quantum Coherence and Quantum Information Systems - Theory (jointly with MA, HL)

TT 22.10: Vortrag

Dienstag, 21. März 2017, 12:00–12:15, HSZ 103

Higher Order Spin Correlation in Semi-Conductor Quantum Dots — •Nina Fröhling and Frithjof Anders — Technische Universität Dortmund, Deutschland

We study higher order auto-correlation functions of electron spin decay in an isolated semi-conductor quantum dot described by the central spin model. The electronic central spin is coupled to a bath of nuclear spins via hyperfine interaction, which dominates the short time regime. Via quantum measurement theory we show that the experiment by Bechtold et al. (Phys. Rev. Lett. 117. 027402, 2016) can be described as a fourth order auto-correlation function. We compare our results obtained from a semiclassical approach, exact diagonalization and a Lanczos algorithm to the experimental results. In order to explain the observed long time dynamics in the forth order autocorrelation the nuclear Zeeman splitting and the strain induced anisotropic quadrupolar moment of the nuclei must be included.