Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)
HL 39.22: Poster
Dienstag, 17. März 2015, 14:00–20:00, Poster F
Hole spin g-factor anisotropy in coupled GaAs/AlAs quantum wells — •Michael Kempf1, Christian Gradl1, Dieter Schuh1, Dominique Bougeard1, Roland Winkler2, Christian Schüller1, and Tobias Korn1 — 1Universität Regensburg, D-93040 Regensburg, Germany — 2Northern Illinois University, DeKalb, Illinois 60115, USA
Using time resolved Kerr rotation (TRKR) we measured the spin dynamics of hole ensembles at low temperatures in undoped coupled quantum well (QW) structures prepared on GaAs substrates with different growth directions. By gating the double QW system we were able to separate the optically generated electron-hole-pairs into the different QW's, leading to a dominance of holes in the broader QW. As a result, we achieved spin dephasing times of several hundreds of picoseconds for the hole ensembles.
Thus, we were able to measure a strong anisotropy of the in-plane hole g-factor. For this, we altered the direction of the magnetic field applied with respect to the QW [1-10] axis in the QW plane. The arising results were in good agreement with numerical expectations.