Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Graphene: Structure and Dynamics
(Joint session of DS, DY, HL, MA, O and TT organized by O)
TT 9.4: Vortrag
Montag, 7. März 2016, 11:15–11:30, H24
Graphene on Ru(0001) as a playground for the studies of the graphene-metal interaction — Elena Voloshina1, Nikolai Berdunov2, and •Yuriy Dedkov2,3 — 1HU Berlin, Germany — 2SPECS GmbH, Germany — 3IHP Frankfurt (Oder), Germany
We employ a combination of surface science methods (ARPES, STM/STS, AFM) and DFT calculations for the studies of the lattice mismatched graphene-Ru interface. Our results demonstrate a site-selective interaction (strong vs weak) between graphene and metal in the moiré lattice. In these studies we show that graphene-hills in this structure can be used as an array of electro-mechanical elastic nano-resonantors with very high resonance frequency (in the THz range). On the next step we modify the graphene-Ru interaction via intercalation. Here the scanning probe microscopy and spectroscopy were used to study the crystallographic structure and electronic properties of the uniform free-standing graphene layers obtained by intercalation of oxygen monolayer in the strongly bonded graphene/Ru(0001) interface. Spectroscopic data show that such graphene layer is heavily p-doped with the Dirac point located at 552 meV above the Fermi level, that corroborates our ARPES data. Experimental data are understood within DFT and the observed effects are in good agreement with the theoretical data.