Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Nanostructures at surfaces: Dots, particles, clusters, arrays I
O 15.2: Vortrag
Montag, 14. März 2011, 15:15–15:30, WIL C107
Tunable quantum dot arrays by self-assembled metal-organic networks — •Nenad Kepcija1, Florian Klappenberger1, Dirk Kühne1, Wolfgang Krenner1, Svetlana Klyatskaya2, Andres Arnau3, Javier Garcia de Abajo4, Mario Ruben2, and Johannes Barth1 — 1Physik Department E20, TU München, Germany — 2Institute of Nanotechnology, Forschungszentrum Karlsruhe, Karlsruhe, Germany — 3Centro de Fisica de Materiales CSIC-UPV/EHU, 20080 San Sebastian, Spain — 4Instituto de Optica CSIC, Serrano 121, 28006 Madrid, Spain
The confinement of Ag(111) surface state electrons by self-assembled, nanoporous metal-organic networks is studied using low-temperature scanning tunneling microscopy/spectroscopy and electronic structure calculations. The honeycomb networks of Co ligands and dicarbonitrile-oligophenyl linkers induce surface resonance states confined in the cavities with a tunable energy level alignment. With the help of a boundary element method (BEM) based on Greens functions the electronic structure is analyzed and compared to different confinement situations. We find that electron scattering on the molecules is repulsive and stronger than on the weakly attractive Co and that the networks represent periodic arrays of coupled quantum dots featuring uniform electronic levels.