Electronic transport and scattering times in tungsten-decorated graphene

TL;DR

This study investigates how tungsten adatoms affect the electronic transport and scattering times in graphene, revealing changes in mobility, doping, and magnetoresistance, with adatoms positioned about 1 nm above the surface.

Contribution

It provides new insights into the effects of dilute tungsten adatoms on graphene's transport properties and their spatial positioning relative to the surface.

Findings

Tungsten adatoms donate electrons to graphene.

Adatoms reduce carrier mobility.

Adatoms are approximately 1 nm above the surface.

Abstract

The electronic transport properties of monolayer graphene have been studied before and after the deposition of a dilute coating of tungsten adatoms on the surface. For coverages up to 2.5\% of a monolayer, we find tungsten adatoms simultaneously donate electrons to graphene and reduce the carrier mobility, impacting the zero- and finite-field transport properties. Two independent transport analyses suggest the adatoms lie nearly 1 nm above the surface. The presence of adatoms is also seen to impact the low field magnetoresistance, altering the signatures of weak localization.