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HL: Fachverband Halbleiterphysik
HL 33: Spin-dependent Transport I
HL 33.4: Vortrag
Dienstag, 15. März 2011, 11:00–11:15, POT 251
Spin-orbit coupling effects in the quantum oscillatory magnetization of asymmetric InGaAs/InP quantum wells in tilted magnetic fields — •Benedikt Rupprecht1, Christian Heyn2, Hilde Hardtdegen3, Thomas Schäpers3, Marc A. Wilde1, and Dirk Grundler1 — 1Lehrstuhl für Physik funktionaler Schichtsysteme, TU München, James-Franck-Str. 1, D-85747 Garching b. M. — 2Institute of Applied Physics, Jungiusstr. 11, D-20355 Hamburg — 3Institute for Bio- and Nanosystems (IBN-1) and JARA Jülich-Aachen Research Alliance, Research Centre Jülich GmbH, D-52425 Jülich
The measurement of the magnetic susceptibility and the de Haas-van Alphen (dHvA) effect was proposed by Bychkov and Rashba in 1984 to study the spin-orbit interaction (SOI) in a structure inversion asymmetric heterostructure and the spin splitting experienced by a two-dimensional electron system (2DES). Micromechanical cantilever magnetometry recently allowed us to measure the magnetization M of asymmetric InGaAs/InP quantum wells. We observe the expected SOI-induced beating patterns in M in both nearly perpendicular and tilted magnetic fields B. Unexpectedly we find phase and frequency anomalies in M vs B which have not been predicted and not been found in magnetotransport experiments. We compare our experimental results with simulations considering SOI, Zeeman splitting and tilted fields. We show that the surprising phase and frequency anomalies go beyond the current theoretical understanding and remain to be clarified. The work is supported via SPP 1285 "Halbleiter-Spintronik" (GR1640/3-2) and the "Nanosystems Initiative Munich" (NIM).