Europhys. Lett.
Volume 75, Number 1, July 2006
Page(s) 139 - 145
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 31 May 2006
Europhys. Lett., 75 (1), pp. 139-145 (2006)
DOI: 10.1209/epl/i2006-10074-0

Switching the current through model molecular wires with Gaussian laser pulses

U. Kleinekathöfer, GuangQi Li, S. Welack and M. Schreiber

Institut für Physik, Technische Universität Chemnitz - 09107 Chemnitz, Germany

received 28 February 2006; accepted in final form 9 May 2006
published online 31 May 2006

The influence of Gaussian laser pulses on the transport through a simple model for molecular wires is investigated within a tight-binding approach for spinless electrons including Coulomb interaction. Motivated by the phenomenon of coherent destruction of tunneling for monochromatic laser fields, situations are studied in which the maximum amplitude of the electric field fulfills the conditions for the destructive quantum effect. It is shown that the average current through the system can be suppressed. For parameters of the model, which do not show a net current without any optical field, a Gaussian laser pulse can establish a temporary current. In addition, the effect of electron interaction on the current is investigated.

73.63.Nm - Quantum wires.
03.65.Yz - Decoherence; open systems; quantum statistical methods.
33.80.-b - Photon interactions with molecules.

© EDP Sciences 2006