title: Magnetism-dependent transport phenomena in hydrogenated graphene: from spin-splitting to localization effects.
abstract: Spin-dependent transport in hydrogenated two-dimensional graphene is explored theoretically. Adsorbed atomic hydrogen impurities can either induce a local antiferromagnetic, ferromagnetic, or nonmagnetic state depending on their density and relative distribution. To describe the various magnetic possibilities of hydrogenated graphene, a self-consistent Hubbard Hamiltonian, optimized by ab initio calculations, is first solved in the mean field approximation for small graphene cells. Then, an efficient order N Kubo transport methodology is implemented, enabling large scale simulations of functionalized graphene. Depending on the underlying intrinsic magnetic ordering of hydrogen-induced spins, remarkably different transport features are predicted for the same impurity concentration. Indeed, while the disordered nonmagnetic graphene system exhibits a transition from diffusive to localization regimes, the intrinsic ferromagnetic state exhibits unprecedented robustness toward quantum interference, maintaining, for certain resonant energies, a quasiballistic regime up to the micrometer scale. Consequently, low temperature transport measurements could unveil the presence of a magnetic state in weakly hydrogenated graphene.
authors.affiliation: Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences (IMCN), Place Croix du Sud 1 (NAPS-Boltzmann), 1348 Louvain-la-Neuve, Belgium. nicolas.leconte@uclouvain.be
authors.forename: Nicolas
authors.initials: N
authors.lastname: Leconte
authors.forename: David
authors.initials: D
authors.lastname: Soriano
authors.forename: Stephan
authors.initials: S
authors.lastname: Roche
authors.forename: Pablo
authors.initials: P
authors.lastname: Ordejon
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Charlier
authors.forename: J J
authors.initials: JJ
authors.lastname: Palacios
mesh_terms: D003198:Computer Simulation; D006108:Graphite; D006859:Hydrogen / Q000737:chemistry*; D008280:Magnetics; D008956:Models, Chemical; D013113:Spin Labels
chemical_list: D013113:Spin Labels; D006108:Graphite; D006859:Hydrogen