Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Graphene II: Excitations and Nanoribbons (joint session O/TT)

O 14.7: Vortrag

Montag, 1. April 2019, 16:30–16:45, H24

Tailoring end states of graphene nanoribbons by magnetic dopants — •Tobias Preis, Sujoy Karan, Tobias Frank, Jaroslav Fabian, Ferdinand Evers, Dieter Weiss, Jonathan Eroms, and Jascha Repp — University of Regensburg, Faculty of Physics - Regensburg, Germany

Zig-zag edges of graphene are predicted to host spin-polarized electronic states and hold great promise for future spintronic device applications [1]. With the help of scanning tunneling microscopy (STM), we investigated the short zig-zag edges of bottom-up synthesized armchair graphene nanoribbons (GNRs), which were fabricated according to the recipe of Cai et al. [2]. We deposited single Co atoms on the surface and positioned them with the help of the STM tip underneath the GNRs. dI/dV spectra taken at the adsorption positions of embedded Co atoms show the emergence of a Kondo-like peak, being distinctly different from any Kondo features of isolated Co adatoms on the Au(111) surface. The peak exhibits a peculiar dependence on the position with respect to the short GNR edge.

[1] K. Nakada et al., PRB 54, 24 (1996)

[2] J. Cai et al., Nature 466, 470 (2010)