Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Quantum Coherence and Quantum Information Systems (joint session TT/MA)

MA 48.2: Talk

Thursday, March 15, 2018, 15:30–15:45, H 2053

Nuclear spin decay in semiconductor quantum dots — •Nina Fröhling¹, Mikhail M. Glazov², and Frithjof B. Anders¹ — ¹Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44227 Dortmund — ²A. F. Ioffe Physico-Technical Institute, 26 Politechnicheskaya, 194021 St. Petersburg, Russia

We study bath spin auto-correlation functions of nuclear spin decay in an isolated semi-conductor quantum dot doped with an electron or an electron hole as 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. We study the analytical solution of the nuclear spin decay with homogeneous hyperfine coupling, as well as other limiting cases. Furthermore, we describe the nuclear spin correlation fully quantum mechanically for up to N = 18 bath spins through time evolution via the Lanczos method and discuss the influence of quadrupolar interaction and nuclear Zeeman splitting on nuclear spin decay.