Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.28: Poster

Freitag, 4. März 2005, 14:00–18:00, Poster TU C

Influence of laser irradiation on the transport in molecular wires — •S. Welack, U. Kleinekathöfer, and M. Schreiber — Institut für Physik, Technische Universität Chemnitz, 09107 Chemnitz

New features of molecular wires can be observed when they are irradiated by laser fields. This can be done by periodically oscillating light fields but also by short laser pulses. Here we restrict ourselves to periodic laser fields though the current propagation method is well suited for short laser pulses as well. The theoretical foundation used for these investigations is the density matrix formalism based on a splitting of the full system into a relevant part and a thermal bath. Recently we have developed a formalism which is based on a time-convolutionless projection-operator approach which includes the interaction with time-dependent laser fields non-perturbatively and is valid at low temperatures [1]. This theory including further extensions is used in the current project for the determination of electron transport through molecular wires. Similar to studies of other groups [2] the coupling between the leads and the wire shall be treated perturbatively. From the population dynamics the current through the molecular wire is determined.

[1] U. Kleinekathöfer, J. Chem. Phys. 121, 2505 (2004).

[2] J. Lehmann, S. Kohler, V. May and P. Hänggi, J. Chem. Phys. 121, 2278 (2004).