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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 44: Transport: Nanoelectronics III - Molecular Electronics 2

TT 44.7: Talk

Thursday, March 29, 2012, 16:45–17:00, BH 334

Quantum Interference Effects in Single-Molecule Junctions — •Stefan Ballmann1, Rainer Härtle2, Pedro Brana-Coto2, Michael Thoss2, and Heiko B. Weber11Lehrstuhl für Angewandte Physik, Universität Erlangen-Nürnberg, Germany — 2Institut für Theoretische Festkörperphysik, Universität Erlangen-Nürnberg, Germany

We analyze quantum interference effects in single-molecule junctions both experimentally and theoretically by means of the mechanically controlled break junction technique, density-functional theory and a non-equilibrium Green’s function approach. Interference occurs as a suppression of the current level, when quasi-degenerate electronic states contribute to transport. Such levels are quite common in many molecules used for single-molecule junctions. However, such destructive interference can be lifted by coupling the electron system to vibrations, resulting in an enhancement of the current [1]. We demonstrate that this effect is dominant in single-molecule junctions by analyzing temperature dependent IV characteristics.
R. Härtle, M. Butzin, O. Rubio-Pons, M. Thoss, Phys. Rev. Lett. 107, 046802 (2011).

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