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Phys Rev Lett. 2011 Jul 1;107(1):016602. Epub 2011 Jun 30.

Magnetoresistance and magnetic ordering fingerprints in hydrogenated graphene.

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1
Departamento de Física Aplicada, Universidad de Alicante, San Vicente del Raspeig, Spain.

Abstract

Spin-dependent features in the conductivity of graphene, chemically modified by a random distribution of hydrogen adatoms, are explored theoretically. The spin effects are taken into account using a mean-field self-consistent Hubbard model derived from first-principles calculations. A Kubo transport methodology is used to compute the spin-dependent transport fingerprints of weakly hydrogenated graphene-based systems with realistic sizes. Conductivity responses are obtained for paramagnetic, antiferromagnetic, or ferromagnetic macroscopic states, constructed from the mean-field solutions obtained for small graphene supercells. Magnetoresistance signals up to ∼7% are calculated for hydrogen densities around 0.25%. These theoretical results could serve as guidance for experimental observation of induced magnetism in graphene.

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