Weak localisation in graphene flakes

TL;DR

This paper investigates how quantum interference manifests uniquely in graphene due to its chiral charge carriers, affecting weak localization behavior across various samples and conditions.

Contribution

It provides a detailed analysis of the elastic and inelastic scattering rates influencing weak localization in graphene, highlighting the impact of sample shape and quality.

Findings

Weak localization in graphene differs from conventional 2D systems.

Elastic and inelastic scattering rates vary with sample shape and quality.

Carrier density, including the Dirac region, affects quantum interference.

Abstract

We show that the manifestation of quantum interference in graphene is very different from that in conventional two-dimensional systems. Due to the chiral nature of charge carriers, it is sensitive not only to inelastic, phase-breaking scattering, but also to a number of elastic scattering processes. We study weak localization in different samples and at different carrier densities, including the Dirac region, and find the characteristic rates that determine it. We show how the shape and quality of graphene flakes affect the values of the elastic and inelastic rates and discuss their physical origin.