Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Graphene: Electronic properties and transport (O, jointly with HL, TT)

HL 24.13: Vortrag

Montag, 11. März 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 Arnau^1,3, Pietro Gambardella², Daniel Sánchez-Portal^1,3, 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).