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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.