Charge transport through a molecule driven by a high-frequency field

S. Kohler, S. Camalet, M. Strass, J. Lehmann, G.-L. Ingold und P. Hänggi

Chem. Phys. 296, 243–249 (2004) DOI: 10.1016/j.chemphys.2003.09.023

We study the current and the associated noise for the transport through a two-site molecule driven by an external oscillating field. Within a high-frequency approximation, the time-dependent Hamiltonian is mapped to a static one with effective parameters that depend on the driving amplitude and frequency. This analysis allows an intuitive physical picture explaining the nontrivial structure found in the noise properties as a function of the driving amplitude. The presence of dips in the Fano factor permits a control of the noise level by means of an appropriate external driving.