Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 28: Focussed Session: Frontiers of Electronic Structure Theory III (jointly with HL and TT)

O 28.10: Talk

Tuesday, March 12, 2013, 14:00–14:30, H36

Theory of nanomagnetic and graphene hybrid systems: adatoms and multiorbital Kondo physics — •Tim Wehling — Institute for Theoretical Physics and BCCMS, University of Bremen, D-28359 Bremen, Germany

Graphene combines chemical inertness with a distinctly symmetric low energy electronic structure. Here, we show based on first-principles calculations that these two characteristics largely determine its interaction with adatoms. We find that covalent bonds to first row elements cause midgap states which can control electron transport [1] and the dielectric properties [2] of graphene based systems. The special nature of the Dirac electrons furthermore governs the coupling of magnetic adatoms to graphene by orbital selection rules and leads to peculiar multiorbital Kondo physics [3,4]. Finally, it is shown how multiorbital effects control the physics of magnetic transition metal atoms coupled to normal metals [5] and topological insulators [6].

[1] T. O. Wehling et al., Phys. Rev. Lett. 105, 056802 (2010).

[2] S. Yuan et al., Phys. Rev. Lett. 109, 156601 (2012).

[3] T. O. Wehling et al., Phys. Rev. B 84, 235110 (2011).

[4] T. O. Wehling et al., Phys. Rev. B 81, 115427 (2010).

[5] B. Surer et al., Phys. Rev. B 85, 085114 (2012).

[6] J. Honolka et al., Phys. Rev. Lett. 108, 256811 (2012).