Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Postersession Transport: Nanoelectronics, Quantum Coherence and Quantum Information, Fluctuations and Noise

TT 35.27: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Electron Dynamics in Molecular Wires Studied by a Density Matrix Approach — •Lisa Mövius and Ulrich Kleinekathöfer — School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany

Recent investigations in the field of molecular electronics [1-3] are targeted on controlling the current through single molecules by laser fields. In the present work, as in [1], the metal-molecule-metal junction is described using a quantum master equation within second-order perturbation theory, since the wire-lead coupling is assumed to be weak. The dynamics of the system can be influenced by applying a laser field, leading to novel effects like coherent destruction of tunneling to effectively suppress the current through the molecular wire. Using a projection operator approach [3] an efficient reduction of dimensionality can be achieved to render effective calculations of longer wires possible.

[1] S. Welack, M. Schreiber, and U. Kleinekathöfer, J. Chem. Phys. 124, 044712 (2006).

[2] I. Franco, M. Shapiro, and P. Brumer, Phys. Rev. Lett. 99, 126802 (2007).

[3] U. Harbola, M. Esposito, and S. Mukamel. Phys. Rev. B 74, 235309 (2006).