Magnetoresistance and Magnetic Ordering Fingerprints in Hydrogenated Graphene

Details Magnetoresistance and Magnetic Ordering Fingerprints in Hydrogenated Graphene Magnetoresistance and Magnetic Ordering Fingerprints in Hydrogenated Graphene

2011-05-05

arxiv.org/abs/1105.1005v1

Phys. Rev. Lett. 107, 016602 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

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-Greenwood 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 $\sim 7%$ 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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