Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Low-Dimensional Systems - Poster Session

TT 80.6: Poster

Mittwoch, 2. April 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.