Magnetoresistance of monolayer graphene with short-range scattering

TL;DR

This study investigates how short-range disorder affects magnetoresistance in monolayer graphene, revealing conditions under which a square root magnetoresistance behavior occurs, supported by experimental data and theoretical analysis.

Contribution

It provides the first detailed experimental and theoretical analysis of square root magnetoresistance in graphene caused by short-range scattering.

Findings

Square root magnetoresistance observed in disordered graphene sample.

No SRMR in samples without significant short-range scattering.

Qualitative agreement between experimental data and theoretical predictions.

Abstract

We present magnetotransport measurements at classical magnetic fields for three graphene monolayers with various levels of disorder. A square root magnetoresistance (SRMR) behavior is observed in one sample which has the characteristic sub-linear conductivity signaling on the presence of short-range disorder in this sample. No square root MR was observed in other samples where short-range scattering is inessential as it is evident from the gate voltage dependences of their conductivities. Comparing our experimental data for the sample with theoretical calculations we found a good qualitative agreement and established the conditions which should be fulfilled in graphene to observe the SRMR experimentally.