Electronic Transport in Graphene with Aggregated Hydrogen Adatoms
Hydrogen adatoms and other species covalently bound to graphene act as resonant scattering centers affecting the electronic transport properties and inducing Anderson localization. We show that attractive interactions between adatoms on graphene and their diffusion mobility strongly modify the spatial distribution, thus fully eliminating isolated adatoms and increasing the population of larger size adatom aggregates. Such spatial correlation is found to strongly influence the electronic transport properties of disordered graphene. Our scaling analysis shows that such aggregation of adatoms increases conductance by up to several orders of magnitude and results in significant extension of the Anderson localization length in the strong localization regime. We introduce a simple definition of the effective adatom concentration x., which describes the transport properties of both random and correlated distributions of hydrogen adatoms on graphene across a broad range of concentrations.
PRL113_246601.pdf
Publisher's version
openaccess
530.51 KB
Adobe PDF
5bb8f9dd389e9344d2b280feeae3c3b2
PRL113_246601_SM.pdf
openaccess
2.59 MB
Adobe PDF
c43adc6ad1de0e3359663d700df2a0f3