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TT: Fachverband Tiefe Temperaturen
TT 80: Low-Dimensional Systems - Poster Session
TT 80.6: Poster
Wednesday, April 2, 2014, 15:00–19:00, P2
Magnetization of two-dimensional electron systems in MgZnO/ZnO heterostructures — •Schorsch Michael Sauther1, Matthias Brasse1, Stephan Albert1, Yusuke Kozuka2, Joseph Falson2, Atsushi Tsukazaki2, Christian Heyn3, Fauzia Jabeen4, Marc Andreas Wilde1, Anna Fontcuberta i Morral4, Masashi Kawasaki2, and Dirk Grundler1 — 1Phys.-Dep. E10, TU München — 2Dep. of App. Phys. and QPEC, University of Tokyo — 3Inst. f. Angew. Phys., Universität Hamburg — 4LMSC, EPF Lausanne
Two-dimensional electron systems (2DESs) in oxide heterostructures have created great interest in the last few years. We study the magnetization M of MgZnO/ZnO heterostructures with 2DESs of small carrier density and high mobility at low temperatures and in high magnetic fields B. We report a sawtooth-like oscillating signal M(B), i.e. the de Haas-van Alphen-effect, from which we extract thermodynamic energy gaps. Furthermore we observe non-equilibrium currents and unexpected overshoots in M(B) that we analyze in terms of the residual disorder. The work is supported by the DFG via TRR 80.