Hall field induced resistance oscillations in two-dimensional Lorentz gases
ORAL
Abstract
Hall field induced resistance oscillations (HIROs) are studied in two-dimensional electron gases with resistivities
dominated by scattering at identical but randomly distributed circular obstacles with hard walls. For
sufficiently high number densities, these obstacles dominate the HIROs, even though they remain sparse in
comparison to the intrinsic scatterers. With increasing obstacle density, we observe a monotonous increase of
the HIRO period up to a factor of 2. The results are interpreted in terms of a substantial localization of the Hall
field around the designed obstacles, providing an alternative explanation for the HIRO scaling factor γ in pristine
two-dimensional electron gases in terms of spatially varying Hall fields.
dominated by scattering at identical but randomly distributed circular obstacles with hard walls. For
sufficiently high number densities, these obstacles dominate the HIROs, even though they remain sparse in
comparison to the intrinsic scatterers. With increasing obstacle density, we observe a monotonous increase of
the HIRO period up to a factor of 2. The results are interpreted in terms of a substantial localization of the Hall
field around the designed obstacles, providing an alternative explanation for the HIRO scaling factor γ in pristine
two-dimensional electron gases in terms of spatially varying Hall fields.
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Publication: Phys. Rev. B 111, 165301 (2025)
Presenters
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Thomas M Heinzel
- University of Dusseldorf