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HL: Fachverband Halbleiterphysik

HL 33: Poster I: Transport, including Magnetic-Field Effects

HL 33.7: Poster

Dienstag, 23. März 2010, 18:30–20:30, Poster D1

Magneto-Transport Studies on Evenly Curved Two-Dimensional Electron Systems in Semiconductor-Microtubes with Hall Bar Contact-Geometry — •David Sonnenberg, Karen Peters, Stefan Mendach, Andrea Stemmann, and Wolfgang Hansen — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

We present magneto-transport studies on evenly curved two-dimensional electron systems (2DES) in InGaAs-microtubes. The microtubes are fabricated from epitaxial films, by releasing thin strained semiconductor layers from the substrate. Strain relaxation causes the film hosting the 2DES to roll-up into tubes with micrometer sized diameters. The rolled-up 2DES are prepared in a Hall-bar contact-geometry along the curvature of the microtube. Low-temperature magneto-transport measurements are performed with current direction parallel to the modulation of the perpendicular magnetic-field component. An asymmetric behaviour of the Hall resistance in dependence of the magnetic field orientation will be discussed.