Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.114: Poster
Montag, 23. März 2009, 14:30–17:00, P2
Investigation of the de Haas-van Alphen effect in an asymmetric InGaAs/InP quantum well — •Benedikt Rupprecht1, Tjark Windisch1, Marc A. Wilde1, Thomas Schäpers2, Christian Heyn3, and Dirk Grundler1 — 1Lehrstuhl für Physik funktionaler Schichtsysteme, Technische Universität München, Physik Department, James-Franck-Str. 1, D-85747 Garching — 2Institute of Bio- and Nanosystems (IBN-1) and Centre of Nanoelectronic Systems for Information Technology (CNI), Research Centre Jülich, D-52425 Jülich — 3Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Jungiusstrasse 11, D-20355 Hamburg
We report on magnetization measurements on a two-dimensional electron system (2DES) in an asymmetric InGaAs/InP quantum well using a micromechanical cantilever magnetometer. The magnetometer has a noise level of about 10−14 J/T at Bext=1 T, allowing the detection of de Haas-van Alphen oscillations of the 2DES at 300 mK. The magnetization is a thermodynamic quantity that at low temperature directly reflects the ground state energy of the system. From the data we can directly extract material parameters such as the g-factor and the effective mass m* as well as information about the spin-orbit coupling. Magnetotransport measurements on similar 2DES revealed a clear beating pattern in the Shubnikov-de Haas oscillations due to the Rashba spin-orbit coupling. We present the measurement setup as well as the results of the magnetization measurements focusing on bandstructure parameters and the spin-orbit interaction.
We acknowledge support through GR1640/3 in SPP1285.