Anomalous Low-Field Classical Magnetoresistance in Two Dimensions

TL;DR

This paper reports a novel negative magnetoresistance in two-dimensional classical electrons at low magnetic fields, caused by a memory effect in backscattering, revealed through numerical simulations.

Contribution

It introduces the discovery of a negative |B|-proportional magnetoresistance in 2D electrons, highlighting a previously unconsidered memory effect in backscattering.

Findings

Negative magnetoresistance proportional to |B| at low fields

Memory effect in backscattering causes the observed behavior

First numerical evidence of this phenomenon in 2D systems

Abstract

The magnetoresistance of classical two-dimensional electrons scattered by randomly distributed impurities is investigated by numerical simulation. At low magnetic fields, we find for the first time a negative magnetoresistance proportional to |B|. This unexpected behavior is shown to be due to a memory effect specific for backscattering events, which was not considered previously.