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O: Fachverband Oberflächenphysik

O 61: Graphene II: Adsorption, Intercalation and Doping

O 61.4: Vortrag

Mittwoch, 9. März 2016, 15:45–16:00, S053

Structural phases of Au-intercalated graphene on Ni(111) — •Maxim Krivenkov^1,2, Evangelos Golias¹, Dmitry Marchenko¹, Jaime Sánchez-Barriga¹, Gustav Bihlmayer³, Oliver Rader¹, and Andrei Varykhalov¹ — ¹Helmholtz-Zentrum Berlin, BESSY-II, 12489, Berlin, Germany — ²Department of Physics, Potsdam University, Am Neuen Palais 10, D-14415, Potsdam, Germany — ³Forschungszentrum Jülich and JARA, 52425, Jülich, Germany

Graphene grown epitaxially on Ni(111) and intercalated with Au is a remarkable system revealing a giant (∼100 meV) spin-orbit splitting of Dirac cone in spin-resolved photoemission experiments [1]. In present study we investigate structural origin of this giant Rashba effect. We report extensive microscopic study of Au-intercalated graphene and discover versatile structural phases of Au locally coexisting at graphene-Ni interface. Besides a continuous monolayer phase giving rise to a pronounced moiré pattern identified as (9.7×9.7) misfit dislocation loop structure [2], we observe various well periodic arrays of nanoparticles trapped under graphene. Overall arrangement of such Au nanoclusters is laterally coherent to the principle moiré pattern of Au monolayer. We test whether these nanoparticles can be a source of giant spin-orbit splitting in graphene by performing DFT study of structural and electronic properties of the system.

[1] D. Marchenko, A. Varykhalov, M. R. Scholz, G. Bihlmayer, E. I. Rashba, A. Rybkin, A. M. Shikin, O. Rader, Nature Commun. 3, 1232 (2012); [2] J. Jakobsen et al., Phys. Rev. Lett. 75, 489 (1995).