Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Nanoelectronics III - Molecular Electronics
TT 6.9: Vortrag
Montag, 26. März 2007, 16:15–16:30, H19
One dimensional organometallic wires: electronic structure and transport properties — •Volodymyr Maslyuk1, Alexei Bagrets2, Mads Brandbyge3, and Ingrid Mertig1 — 1Martin-Luther-Universität Halle-Wittenberg, Physical Department, Halle, Germany — 2Institute of Nanotechnology, Forschungszentrum Karlsruhe, Germany — 3NanoDTU, MIC-Department of Micro and Nanotechnology, Technical University of Denmark, Lyngby, Denmark
During the last years, organometallic systems have attracted increasing attention. The small size of the molecules and the spin degree of freedom allow us to consider them as independent logic units and think about new electronic devices with unforeseen properties. Here, we focus on multi-decker metal-cyclopentadienyl Met(C5H5) and metal-benzene Met(C6H6) molecules. Recently, we have predicted that a one-dimensional vanadium-benzene wire is a half-metallic ferromagnet and finite V(C6H6) clusters coupled to magnetic leads are working as spin-filter [1]. Moreover, our bias dependence calculations show conservation of the half-metallic properties in a wide voltage window. Using density functional theory and the non-equilibrium Green's-function method, implemented in the TranSIESTA code [2], we have investigated the electronic and transport properties of 1D organometallic wires coupled with Co(100) electrodes. We have also investigated the electron transport through the molecules in the case of antiparallel magnetic configuration of the electrodes and predict an impressive magnetoresistance effect. [1] V. Maslyuk et al., Phys. Rev. Lett 97, 097201 (2006). [2] M. Brandbyge et al. Phys. Rev. B 65, 165401 (2002).