Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Graphene: Electronic Properties and Transport (jointly with HL, MA and TT)
O 23.13: Talk
Monday, March 11, 2013, 19:00–19:15, H17
Electron scattering and spin polarization at the graphene/Ni(111) interface — Aran Garcia-Lekue1, Timofey Balashov2, Marc Ollé2, Gustavo Ceballos2, Andrés Arnau1,3, Pietro Gambardella2, Daniel Sánchez-Portal1,3, and •Aitor Mugarza2 — 1Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, E-20018 San Sebastian, Spain — 2Catalan Institute of Nanotecnology (ICN), UAB Campus, E-08193 Bellaterra, Spain — 3Centro de Fisica de Materiales CFM - MPC, Centro Mixto CSIC-UPV, Apdo. 1072, San Sebastian, Spain
The interaction of graphene with a metal often perturbs the unique electronic properties of Dirac electrons in graphene. This interaction can be positively exploited to engineer the Dirac bands and obtained graphene interfaces with different functionalities. In this work we study the electronic properties of graphene nanoislands grown on Ni(111) [1] by combining scanning tunnelling microscopy and ab-initio calculations. We show that the interaction with the Ni surface opens a gap and spin-polarizes the Dirac bands, which results in a spin filtering effect in the transport across the interface [2]. On the other hand, the standing wave pattern created around the nanoislands reveal an asymmetric potential that depends both on the spin and edge type, suggesting a lateral 2D spin-filter effect similar to that occurring across the interface.
[1] M. Olle et al. Nano Lett. 12, 4431 (2012). [2] V. M. Karpan et al. Phys. Rev. Lett. 99, 176602 (2007).