Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.33: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Quantitative analysis of the hole-g-tensor in low-symmetry two dimensional hole systems — Christian Gradl1, Michael Kempf1, •Johannes Holler1, Roland Winkler2, Dieter Schuh1, Dominique Bougeard1, Alberto Hernández-Mínguez3, Klaus Biermann3, Paulo Santos3, Christian Schüller1, and Tobias Korn1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany — 2Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA — 3Paul-Drude-Institut für Festkörperelektronik, D-10117 Berlin, Germany
The complex structure of the valence band in most semiconductors leads to varied and in some cases unusual properties for spin-3/2 hole systems compared to typical spin-1/2 electron systems. In particular, two-dimensional hole systems show a highly anisotropic Zeeman spin splitting. We have investigated this anisotropy in GaAs/AlAs double quantum well structures both experimentally and theoretically. By performing time-resolved Kerr rotation measurements, we found a non-diagonal hole g-tensor, manifesting itself in unusual signal shapes as well as distinct dependencies on the magnetic field direction. We quantify the individual tensor components for [110]-, [113]- and [111]-grown samples and find very good agreement with our theoretical calculations.