Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Graphene (organized by O)

TT 50.6: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Electronic and transport properties of graphene nanoribbons on Ni(111) — •Bernhard Kretz1 and Aran Garcia-Lekue1,21Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, E-20018 San Sebastian, Spain — 2IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain

It is well known that graphene holds a great potential for electronic applications. The graphene-Ni system is an interesting case where the interaction with the ferromagnetic substrate gives rise to a number of remarkable phenomena.[1] In particular, the spin-dependent scattering of electrons at the edges of graphene islands on Ni(111) makes this system very interesting for spintronic devices.[2] Besides, the electron scattering is found to be dependent on the detailed edge structure of the graphene islands, which can exhibit unreconstructed or Stone-Wales reconstructed zigzag edge conformations.[3] In this work, we study the influence of the edge structure on the transport properties across graphene-Ni junctions. We consider graphene nanoribbons on Ni(111) with an unreconstructed and a Stone-Wales reconstructed zigzag edge, both of which are unpassivated, and we use density functional theory (DFT) calculations using the SIESTA and TranSIESTA codes.

[1]V. M. Karpan et al., Phys. Rev. Lett. 99, 176602 (2007); M. Weser et al., APL 96, 012504 (2010)

[2] A. Garcia-Lekue et al., PRL 112, 066802 (2014)

[3] A. Garcia-Lekue et al., submitted

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