Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 13: Electronic structure II
O 13.1: Talk
Monday, March 23, 2009, 15:00–15:15, SCH A216
Self-assembled arrays of molecular quantum resonators — •Florian Klappenberger1, Dirk Kühne1, Wolfgang Krenner1, Iñaki Silanes2, Andres Arnau2, Javier García de Abajo3, Svetlana Klyatskaya4, Mario Ruben4, and Johannes Barth1 — 1Physik Department E20, TU München, Germany — 2Departamento 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
Confinement of Ag(111) surface state electrons by self-assembled, periodic, two-dimensional, nanoporous networks is studied by means of low-temperature scanning tunneling microscopy/spectroscopy and electronic structure calculation. We compare the case of a purely organic, hydrogen bonded Kagomé network constructed from dicarbonitrile-sexiphenylene molecules with the case of a Co-directed assembly of a metal-organic honeycomb network of the same molecule featuring a pore size of 24 nm2. Both network types induce resonance states within the cavities with varying lateral electronic density distribution. The spectroscopic features of the resonances together with our analysis employing a boundary element method based on Greens functions indicate finite reflection at the boundaries of the cavities, thus transmission through the pore boundaries allows interaction of electrons in neighboring resonators. By the choice of the network we can steer the pore shape and size and hence engineer the electronic properties of the functionalized surface.