Current dependence of the huge negative magnetoresistance in high-mobility two-dimensional electron gases

TL;DR

This paper investigates the negative magnetoresistance in high-mobility two-dimensional electron gases, revealing its dependence on magnetic field, current, and carrier concentration, explained by elastic scattering interactions within and between Landau levels.

Contribution

It provides a detailed analysis of the current dependence of negative magnetoresistance, highlighting the role of elastic scattering in high-mobility 2DEGs at low magnetic fields.

Findings

Negative magnetoresistance is significant at low magnetic fields.

Non-linear behavior of magnetoresistance depends on carrier concentration.

Elastic scattering within and between Landau levels explains the observed phenomena.

Abstract

In high-mobility two-dimensional electron gases Landau levels are already formed at very small magnetic field values. Such two-dimensional electron gases show a huge negative magnetoresistance at low temperatures and an unexpected and very strong non-linear behavior with the applied current. This non-linearity depends on carrier concentration and is explained by the subtle interplay of elastic scattering within Landau levels and in between Landau levels.