Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 97: Graphene: Structure (jointly with O, HL)
TT 97.2: Vortrag
Donnerstag, 19. März 2015, 10:45–11:00, MA 041
Manganese Intercalation in Graphene/Ir(111): electronic structure — •Hendrik Vita1, Stefan Böttcher1, Yuriy Dedkov2, and Karsten Horn1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2SPECS Surface Nano Analysis GmbH, Berlin, Germany
Transition metal surfaces are ideal templates for the growth of high quality graphene films. The system graphene/Ir(111) shows rather weak interaction between substrate and the graphene layer. It is well known that transition metals such as Ni and Co, intercalated under graphene/Ir(111), show a rather strong interaction with graphene, yielding massive modifications of the graphene π-band. The intercalation of Mn thin films underneath graphene seems interesting in this context, since Mn has a half filled 3d shell, and the graphene sheet may act as an inert, passivating cover. Here we investigate graphene/Mn/Ir(111) by deposition on top of graphene/Ir(111), and follow the intercalation process by annealing at moderate temperatures using XPS. Investigating the band structure by high resolution ARPES, the Dirac cone is preserved, and we observe a trigonal suppression of the replica Dirac cones, probably due to an enhanced corrugation of the graphene film. A totally different situation occurs if the intercalation process is performed at much higher temperatures. Drastic changes in the band structure emerge, with a shifted π-band to higher binding energies, and a chemical shift of the C1s core level. Additionally, a restructuring of the intercalated Mn thin film is observed by LEED.