Curved two-dimensional electron gases |
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Authors: | Axel Lorke Stefan Bhm Werner Wegscheider |
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Institution: | a Institut für Physik, Universität Duisburg-Essen, Lotharstr. 1, 47048, Duisburg, Germany;b Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität-München, Geschwister-Scholl-Platz 1, 80539, Munich, Germany;c Walter-Schottky-Institut der TU München, Am Coulombwall, 85747, Garching, Germany |
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Abstract: | A method is introduced which makes it possible to fabricate non-planar two-dimensional electron gases. Making use of the “epitaxial lift-off” process, patterned, gated and contacted heterostructures are transferred from their crystalline substrate onto small glass tubes with diameters of a few millimeters. The transport properties of two-dimensional electron gases inside these curved semiconductor films are characterized by low-temperature magnetoresistance measurements. In the longitudinal resistance we find weak Shubnikov–de Haas oscillations, which are periodic in B−1. The transverse resistance exhibits well-developed quantum Hall plateaus at low magnetic fields. At high fields, we observe a pronounced breakdown of the Hall effect. The experimental results are compared with simple theoretical models. |
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Keywords: | Epitaxial lift-off Quantum Hall effect Curved electron gases |
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