Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.85: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
Tunneling Spectroscopy of nanoporous networks - comparison of experiment and modelization — •Wolfgang Krenner1, Dirk Kühne1, Florian Klappenberger1, Iñaki Silanes2, Andres Arnau2, Javier García de Abajo3, Svetlana Klyatskaya4, Mario Ruben4, and Johannes Barth1 — 1Physik Department E20, TU München, Germany — 2Donostia International Physics Center (DIPC) and Departamento de Fisica de Materiales and Unidad de Fisica de Materiales, E-20018 San Sebastian, Spain — 3Instituto de Óptica CSIC, Serrano 121, 28006 Madrid, Spain — 4Institute of Nanotechnology, Forschungszentrum Karlsruhe, Karlsruhe, Germany
We present spectroscopic data obtained by Scanning Tunneling Spectroscopy (STS) from self-assambled organic and metal coordinated carbonitrile polyphenyl (CN-Phx-NC) networks deposited on a Ag(111) surface under ultra high vacuum conditions. The molecules form highly regular organic networks depending on the length of the molecules and coverage. By further evaporating Co onto the sample, metal coordinated honeycomb networks are formed by three CN-Phx-NC molecules binding to one Co atom.
These networks impose a modulation upon the local density of states (LDOS) of the quasi 2D electron system of the Ag surface state. Different types of networks were investigated by STS. The lateral confinement of the electrons manifested in various standing wave patterns in dI/dV maps at different energies. First results show good agreement with modelling by a boundary element method.