Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.25: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

A Scanning tunneling microscope study of single Phthalocyanine molecules on ultra thin insulating layers on different metal substrates — Jens Brede, •Jörg Schwöbel, Stefan Kuck, Germar Hoffmann, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany

Recent scanning tunnelling microscopy (STM) investigations of pristine molecular features probed with sub-molecular resolution have opened a gateway for future single-molecule-devices. Among these experiments are the study of electron transport via electronic and vibronic excitations [1], the current induced switching of Hydrogen atoms[2] or the spin state of a central magnetic ion[3]. It shows that a sufficient electronic decoupling of the molecule from a metallic substrate is mandatory to grant access to the immaculate molecular properties.

Here, we study single Metal-Phthalocyanine (M-Pc) molecules on insulating layers on different noble metal surfaces with a low temperature STM operated at 6K.

We use atomic resolution to determine the adsorption site of the M-Pc with respect to the underlying layer and probe locally the electronic properties, in particular the highest occupied and the lowest unoccupied molecular orbital (HOMO & LUMO), by scanning tunnelling spectroscopy (STS).

[1] Proc. Natl. Acad. Sci. U. S. A., 2005, 102, 8832-8837 [2] Science, 2007, 317, 1203-1206 [3] Phys. Rev. Lett., 2009, 102, 167203