Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Nanostructures at surfaces III
O 66.2: Vortrag
Donnerstag, 29. März 2012, 10:45–11:00, MA 042
Measuring the one-dimensional band structure of an armchair graphene nanoribbon — •Christopher Bronner1, Felix Leyssner1, Stephan Meyer1, Manuel Utecht2, Peter Saalfrank2, Tillmann Klamroth2, and Petra Tegeder1 — 1Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany — 2Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany
Besides other low-dimensional carbon materials, graphene nanoribbons (GNRs) have attracted great interest in the past years. These flat, quasi-one-dimensional structures which can be thought of as stripes cut out of graphene, offer a wide range of band structures depending e.g. on their width, edge shape and applied electric fields, which makes them interesting for nanotechnology applications. Despite the intriguing properties predicted by theory, relatively few experiments have been conducted on GNRs because the fabrication of well-defined, narrow ribbons is challenging. Recently, surface-assisted bottom-up fabrication has been employed on the Au(111) surface to produce a defect-free GNR [1]. We employed complementary surface-sensitive spectroscopies and supporting DFT calculations to determine the electronic structure of those particular GNRs, especially the band gap and dispersion. [1] J. Cai et al., Nature 466, 470-473 (2010)