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Wednesday, 22 June 2011

Evidencing a relation between intrinsic magnetism and quantum transport in weakly hydrogenated graphene-based materials

A fascinating feature of Graphene is the possibility to produce magnetic ordering of local spins, by disrupting symmetries though defects.

This theoretical study shows that hydrogen impurities can give rise to such intrinsic magnetic ordering, but more remarkably, it is found that transport features strongly differ depending on the hydrogen distribution on graphene, at a fixed impurity concentration. While the disordered nonmagnetic graphene system exhibits a transition from diffusive to localization regimes, the intrinsic ferromagnetic state exhibits unprecedented robustness towards quantum interferences, maintaining, for certain resonant energies, a quasiballistic regime up to the micrometer scale.