Volume 128, Number 6, December 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||05 February 2020|
Effect of background scattering on the magnetoconductance of two-dimensional Lorentz gases
1 Condensed Matter Physics Laboratory, Heinrich Heine Universität - Universitätsstr.1, 40225 Düsseldorf, Germany
2 Physikalisch- Technische Bundesanstalt - Bundesallee 100, 38116 Braunschweig, Germany
3 CNRS, Univ. Paris- Sud, Université Paris-Saclay, C2N Marcoussis - 91460 Marcoussis, France
Received: 18 September 2019
Accepted: 13 January 2020
The magnetotransport of two-dimensional Lorentz gases is studied in the presence of two types of additional disorder. We observe that at small magnetic fields, dynamic background potentials cause an increase of the conductivity, while it decreases in response to static background potentials, implemented by a secondary Lorentz gas with large mean free path. At intermediate and large magnetic fields, the effect of the additional disorder is independent of its character but changes sign at a threshold magnetic field. The observed phenomenology is interpreted in terms of the influence the background scattering exerts on classical memory effects, in particular on retroreflection, transient superdiffusive motion and drift along the edges of obstacle clusters.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)
© EPLA, 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.