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HL: Fachverband Halbleiterphysik

HL 71: Transport Properties

HL 71.2: Vortrag

Donnerstag, 23. März 2017, 09:45–10:00, POT 112

Snake-orbit induced magnetoresistance oscillations in 2D electron gases — Andreas Leuschner¹, •Jakob Schluck¹, Mihai Cerchez¹, Thomas Heinzel¹, Klaus Pierz², and Hans Werner Schumacher² — ¹Heinrich Heine University Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf — ²Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig

Localized magnetic fields of alternating sign in 2D electron gases give rise to snake- orbits. This may be realized in a Hall bar by the superposition of a homogeneous perpendicular magnetic field and a localized magnetic barrier of opposite sign [1]. The snake orbits redirect the edge states coming from source to the magnetic barrier from one edge of the Hall bar to the other, where, depending on the incident position they can be further directed back to source, or transmitted across the barrier. This has a commensurate periodic character, leading to oscillations in magnetoresistance. Experimental results and simulations are presented.

[1] S. Hugger, M. Cerchez, H. Xu, and T. Heinzel, Phys. Rev. B 76, 195308 (2007)