Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 26: Transport - Poster Session

TT 26.41: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

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

The electron transport through a molecular wire under the influence of an external laser field is studied using a reduced density matrix formalism [1]. The full system is partitioned into the relevant part, i.e. the wire, electronic reservoirs and a thermal phonon bath. An earlier second-order perturbation theory approach of Meier and Tannor for bosonic environments which employs a numerical decomposition of the spectral density is used to describe the coupling to the phonon bath and is extended to deal with the electron transfer between the reservoirs and the molecular wire. Furthermore, from the resulting time-nonlocal (TNL) scheme a time-local (TL) approach can be derived. Both are employed to propagate the reduced density operator in time for a time-dependent system Hamiltonian which incorporates the laser field non-perturbatively. In addition, an optimal control algorithm designed for open quantum systems is employed in order to compute optimal laser control fields to control the current through the wire.

[1] S. Welack, M. Schreiber and U. Kleinekathöfer, cond-mat/0509442.