Regensburg 2000 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 12: Poster I: Quanten Hall Effekt (1-9), II-VI Halbleiter (10-17), Epitaxie (18-23), Quantenpunkte und -dr
ähte (24-50), Photonik (51-59), Metall-Isolator Übergang (60-64), Si/Ge (65-67), Elektronentheorie (68-69), Amorphe Halbleiter, Ionen-Implantation
HL 12.5: Poster
Montag, 27. März 2000, 14:00–19:00, A
Cantilever-Magnetometry on Two-Dimensional Electron Systems — •Markku Schwarz, Dirk Grundler, Christian Heyn, and Detlef Heitmann — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg
We present magnetization-measurements on a two-dimensional electron system (2DES). Using micromechanical cantilever magnetometers with an integrated 2DES we have investigated the equilibrium magnetization as well as the effect of non-equilibrium eddy-currents. The cantilever-devices were fabricated by lithography and selective etching. The etch-stop layers and the AlGaAs/GaAs heterostructure were inserted by molecular beam epitaxy. We reach a sensitivity of 10−13 J/T, which enables us to study the deHaas-vanAlphen-effect in a 2DES of only 0.04 cm2 area. In the vicinity of filling factors with vanishing longitudinal resistance a sweeping magnetic field induces non-equilibrium currents. The breakdown of the quantum Hall effect limits the strengths of these quasi-persistent currents.