Strong suppression of weak (anti)localization in graphene

TL;DR

This paper reports the unexpected strong suppression of weak (anti)localization effects in graphene's low-field magnetoresistance, attributed to mesoscopic corrugations causing dephasing similar to a random magnetic field.

Contribution

It reveals that mesoscopic corrugations in graphene significantly suppress weak localization, a novel insight into quantum interference effects in two-dimensional materials.

Findings

Weak localization is strongly suppressed or absent in graphene.

Mesoscopic corrugations cause dephasing akin to a random magnetic field.

Suppression of quantum interference effects in graphene observed.

Abstract

Low-field magnetoresistance is ubiquitous in low-dimensional metallic systems with high resistivity and well understood as arising due to quantum interference on self-intersecting diffusive trajectories. We have found that in graphene this weak-localization magnetoresistance is strongly suppressed and, in some cases, completely absent. This unexpected observation is attributed to mesoscopic corrugations of graphene sheets which cause a dephasing effect similar to that of a random magnetic field.