Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Nanostructures at surfaces II
O 54.5: Vortrag
Mittwoch, 28. März 2012, 17:45–18:00, MA 042
2D-Quantum confinement in nanoporous networks — •Nenad Kepčija1, Florian Klappenberger1, Wolfgang Krenner1, Javier García de Abajo2, and Johannes Barth1 — 1Physik Department E20, Technische Universität München, James-Franck Straße, 85748 Garching, Germany — 2Instituto de Optica - CSIC, Serrano 121, 28006 Madrid, Spain
Quantum confinement of a 2D electron gas in supramolecular nanoporous networks is investigated using the Boundary Elements Method (BEM) based on Green’s functions for finite geometries and electron plane wave expansion (EPW) for periodic systems. The ”particle in a box” picture was analyzed for cases with selected symmetries that model previously reported architectures constructed from purely organic and metal-organic scattering centers. The networks can be seen as arrays of coupled quantum dots. By varying the appropriate parameters we demonstrate how the scattering properties affect the electronic characteristics. For the reported features of the local density of states (LDOS) we were able to separate lifetime broadening from splitting of quantum dot states due to nearest-neighbour interaction. For each system we analyze the local electron density distribution and relate it with the corresponding band structure. Thereby, we connect the complementary information typically obtained by local scanning tunneling spectroscopy and k→-sensitive angle-resolved photoemission spectroscopy.