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HL: Fachverband Halbleiterphysik
HL 51: Poster IV
HL 51.25: Poster
Thursday, February 28, 2008, 16:30–19:00, Poster D
Magnetotransport measurements on a GaAs/GaAlAs high mobility sample — •Lina Bockhorn1, Frank Hohls1, Werner Wegscheider2, and Rolf J. Haug1 — 1Institut für Festkörperphysik, Universität Hannover — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg
We study the fractional Quantum-Hall effect in a high mobility two-dimensional electron system (2DES). The Hall geometry is created by photolithography on a GaAs/GaAlAs heterostructure containing a 2DES. The mobility and the density of electrons are manipulated by illuminating the sample with an infrared LED and by using a topgate. Driving a constant current along the Hall bar we measure the longitudinal and the transversal resitance depending on an external magnetic field and we observe Shubnikov-de Haas (SdH) oscillations. For a given density of electrons we study the SdH oscillations for different temperatures.