Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.83: Poster

Dienstag, 18. März 2025, 18:00–20:00, P1

Anomalous Hall effect in a two-dimensional disordered Lorentz gas — •Frederik Bartels¹, Zakaria Harroud¹, Beate Horn-Cosfeld¹, Mihai Cerchez¹, Jürgen Horbach², and Thomas Heinzel¹ — ¹Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany — ²Theoretical Physics II: Soft Matter, Heinrich Heine University, Düsseldorf, Germany

Using a combination of experiment and simulation, it was studied the magnetotransport in a two-dimensional disordered Lorentz gas with cross-shaped obstacles. Our focus is on the investigation of the Hall effect for obstacle densities beyond the low-density limit. From previous studies, we know that for lower obstacle densities, the magnetotransport properties, as obtained from the simulation and the experiment of a pristine sample, can be well described in terms of the Drude-Boltzmann model. At higher obstacle densities, deviations from the normal Hall effect are observed, depending on both obstacle density and magnetic field. These results extend previous studies on circular obstacles, where similar deviations were observed and the Hall coefficient does not accurately reflect the electron density because of the presence of memory effects. [1]
[1] B. Sanvee et al. Phys. Rev. B 108, 035301 (2023)

Keywords: Hall effect; Lorentz gas; magnetotransport; retroreflection; memory effect