Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Metal substrates: Adsorption of organic / bio molecules VI

O 49.5: Talk

Wednesday, March 16, 2011, 16:00–16:15, PHY C213

Electronic Decoupling in Monolayer and Multilayer: Fe-Phthalocyanine on Ag(111) — •Thiruvancheril Gopakumar¹, Thomas Brumme², Jörg Kröger¹, Cormac Toher², Giovanni Cuniberti², and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — ²Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, D-01069 Dresden, Germany

Electronic properties of Fe-phthalocyanine (FePc) molecules in ultrathin films on Ag(111) have been investigated by scanning tunnelling spectroscopy and density functional calculations. Single FePc molecules show a broad signature of Fe d orbitals. However, in a two-dimensional ordered superstructure spectroscopic contributions from individual d_z² and d_xz/d_yz orbitals are resolved. Calculations suggest that an increased molecule-surface distance in the superstructure and a change of the Ag(111) surface electronic structure cause the spectral changes, which are consistent with a partial electronic decoupling of the molecules from the substrate. A progressive evolution towards a gap around the Fermi level is observed for molecules atop the first and second molecular layer.

Financial support by the Deutsche Forschungsgemeinschaft through SFB 677 is acknowledged.