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O: Fachverband Oberflächenphysik

O 19: Symposium Spin-Orbit Coupling and Spin Relaxation in Graphene and Carbon Nanotubes

O 19.1: Hauptvortrag

Montag, 22. März 2010, 14:00–14:35, H1

Models for spin-orbit coupling in graphene — •Francisco Guinea — Instituto de Ciencia de Materiales de Madrid. CSIC. Cantoblanco. 28049 Madrid. Spain

The spin-orbit coupling in the carbon atom is relatively weak, due to its low nuclear charge. This makes graphene an interesting material for spintronics applications. Nevertheless, the intrinsic spin-orbit coupling can lead, at least at low temperatures, to the spin Hall effect, with topologically protected edge currents. Extrinsic effects, like electric fields, corrugations, and impurities, can modify significantly the spin-orbit coupling. Similar effects take place in carbon nanotubes. Models for the effect of impurities and corrugations are reviewed[1-3], and compared to available experimental data.

Work done in collaboration with D. Huertas-Herrero, A. Brataas, and A. H. Castro-Neto.

[1] Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps, D. Huertas-Hernando, F. Guinea, A. Brataas, Phys. Rev. B. vol. 74, 155426 (2006). [2] Impurity-Induced Spin-Orbit Coupling in Graphene, A. H. Castro Neto and F. Guinea, Phys. Rev. Lett., vol. 103, 026804 (2009). [3] Spin-Orbit-Mediated Spin Relaxation in Graphene, D. Huertas-Herrero, F. Guinea, A. Brataas, Phys. Rev. Lett. vol. 103, 146801 (2009).