Localized Spins on Graphene

Details Localized Spins on Graphene Localized Spins on Graphene

2008-10-22

arxiv.org/abs/0810.4140v2

Phys. Rev. Lett. 102, 046801 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 4 figures. Added references

Scientific paper

10.1103/PhysRevLett.102.046801

The problem of a magnetic impurity, atomic or molecular, absorbed on top of a carbon atom in otherwise clean graphene is studied using the numerical renormalization group. The spectral, thermodynamic, and scattering properties of the impurity are described in detail. In the presence of a small magnetic field, the low energy electronic features of graphene make possible to inject spin polarized currents through the impurity using a scanning tunneling microscope (STM). Furthermore, the impurity scattering becomes strongly spin dependent and for a finite impurity concentration it leads to spin polarized bulk currents and a large magnetoresistance. In gated graphene the impurity spin is Kondo screened at low temperatures. However, at temperatures larger than the Kondo temperature, the anomalous magnetotransport properties are recovered.

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