Large magnetoresistance by Pauli blockade in hydrogenated graphene

TL;DR

This study demonstrates a giant positive in-plane magnetoresistance in hydrogenated graphene caused by Pauli blockade of hopping conduction, highlighting the role of spin polarization and electron interactions in 2D materials.

Contribution

It reports the first observation of large in-plane magnetoresistance in hydrogenated graphene linked to Pauli blockade effects, revealing new insights into spin-related transport phenomena.

Findings

Positive magnetoresistance exceeds 200% at 300 mK

Magnetoresistance switches sign depending on magnetic field orientation

Spin polarization significantly influences electron transport in graphene

Abstract

We report the observation of a giant positive magnetoresistance in millimetre scale hydrogenated graphene with magnetic field oriented in the plane of the graphene sheet. A positive magnetoresistance in excess of 200\% at a temperature of 300 mK was observed in this configuration, reverting to negative magnetoresistance with the magnetic field oriented normal to the graphene plane. We attribute the observed positive, in-plane, magnetoresistance to Pauli-blockade of hopping conduction induced by spin polarization. Our work shows that spin polarization in concert with electron-electron interaction can play a dominant role in magnetotransport within an atomic monolayer.