Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.54: Poster
Tuesday, March 10, 2026, 18:00–20:00, P1
Nonequilibrium transport in designed random obstacle arrays — •Frederik Bartels1, Johannes Strobel1, Beate Horn-Cosfeld1, Mihai Cerchez1, Klaus Pierz2, Hans Werner Schumacher2, Dominique Mailly3, and Thomas Heinzel1 — 1Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany — 2Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany — 3CNRS, Université Paris-Saclay, C2N Marcoussis, 91460 Marcoussis, France
Nonequilibrium transport phenomena in two-dimensional electron systems include Hall field induced resistance oscillations (HIROs), zero resistance states (ZRS), phase inversion of SdH oscillations, and modifications of the giant negative magnetoresistance (GNMR). In our recent work [1], we studied HIROs in two-dimensional electron gases dominated by scattering at artificially introduced, randomly distributed circular obstacles. For sufficiently high obstacle densities, these scatterers dominate the HIROs. The HIRO period increases with obstacle density, indicating a localization of the Hall field around the obstacles and providing an alternative explanation of the scaling factor γ in terms of spatially varying Hall fields. Here, we extend these studies to cross-shaped obstacle geometries designed to enhance backscattering - the central mechanism in the theory of HIROs [2]. The findings may help to establish a more unified understanding of nonlinear resistance oscillations in two-dimensional systems with artificial scatterers. [1] Bartels et al. Phys. Rev. B 111, 165301 (2025), [2] Yang et al. Phys. Rev. Lett. 89, 076801 (2002)
Keywords: oscillations; 2DEG; nonequilibrium; two-dimensional; obstacles