Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Graphene III

O 41.3: Talk

Wednesday, March 28, 2012, 11:00–11:15, MA 041

Intercalation of transition metals underneath graphene on Rh(111) and Ir(111) — •Mikhail Fonin¹, Philipp Leicht¹, Konstantin Krausert¹, Lukas Zielke¹, Muriel Sicot¹, and Yuriy Dedkov² — ¹Fachbereich Physik, Universität Konstanz, Konstanz, Germany — ²SPECS Surface Nano Analysis GmbH, Berlin, Germany

Structure and electronic properties of atomically sharp interfaces between graphene and transition metal surfaces are both of fundamental and technological interest in view of possible device applications. Intercalation of other metals between graphene and metallic substrate can be used to controllably modify the electronic properties of the graphene/metal interfaces.

In this work we report on the intercalation of transition metals (Fe, Co, Ni, Au) underneath a graphene monolayer on Rh(111) and Ir(111). Scanning tunneling microscopy (STM) and photoemission spectroscopy (PES) are implemented to study the atomic structure as well as the electronic properties of the intercalation systems. We show that intercalation starts already at temperatures as low as 400°C and can be efficiently performed up to 600°C without any visible damage of the graphene overlayer. Atomically-resolved imaging of the graphene surface after intercalation shows considerable changes of the moire structure on top of intercalated metal patches due to the changing of the bonding strength. The corresponding changes in the electronic structure of graphene are reflected in the PES spectra.