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HL: Fachverband Halbleiterphysik

HL 52: Transport properties

HL 52.5: Vortrag

Freitag, 30. März 2007, 12:00–12:15, H14

Edge effects and elastic scattering in magnetic barriers — Mihai Cerchez¹, •Stefan Hugger¹, Thomas Heinzel¹, and Nico Schulz² — ¹Heinrich-Heine Universität, 40225 Düsseldorf — ²Frauenhofer Institut für angewandte Festkörperphysik, 79108 Freiburg

We have studied the electronic transport through magnetic barriers in two-dimensional electron gases. The experiments were performed on magnetic barriers originating from the stray field of magnetized dysprosium platelets on top of a GaAs-AlGaAs heterostructure. We observed that even for high magnetic barriers, the resistance across the magnetic barrier shows a saturation behavior above a critical barrier amplitude [1]. We simulated the experiments by a semiclassical model based on the Landauer-Büttiker formalism [3], taking into account both edge effects as well as elastic scattering. [2]. The simulations are in excellent quantitative agreement with the experimental results, in particular considering that the model does not contain any fit parameters.
T. Vancura, et al, Phys. Rev. B 62, 5074 (2000)
M. Büttiker, Phys. Rev. Lett. 57, 1761 (1986)
M. Cerchez et al, submitted to Phys. Rev. B.