Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 29: Metal substrates: Adsorption of organic / bio molecules II
O 29.2: Vortrag
Dienstag, 27. März 2012, 10:45–11:00, MA 043
A three-state single molecular junction — •Yongfeng Wang1, Nicolas Néel2, Jörg Kröger2, Hector Vázquez3, Mads Brandbyge3, Bin Wang4, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, D-24098 Kiel, Germany — 2Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, German — 3DTU Nanotech - Department of Micro and Nanotechnology, NanoDTU, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark — 4Department of Physics and Astronomy, Vanderbilt University Nashville, TN 37235, USA
Single molecule electronics aims at using individual molecules as electronic components for miniaturizing electric circuits. Molecular switches, diodes, and transistor-like devices have been reported. Passing current through molecules inevitably causes heating which may be detrimental for their functionality. Here, Ag-Sn-Phthalocyanine-Ag junctions are shown to exhibit three conductance states. While the junctions are conductive at low bias, their impedance drastically increases above a critical bias. Two-level fluctuations occur at intermediate bias. These characteristics may be used to protect a nanoscale circuit. Further experiments along with calculations reveal that the self-limiting conductance of junctions is due to reversible changes of the junction geometry. Financial support through SFB 677 is acknowledged.