https://doi.org/10.1140/epjb/e2006-00439-7
Coulomb repulsion effects in driven electron transport
Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
Corresponding author: a Franz.Josef.Kaiser@Physik.Uni-Augsburg.DE
Received:
23
June
2006
Published online:
15
December
2006
We study numerically the influence of strong Coulomb repulsion on the current through molecular wires that are driven by external electromagnetic fields. The molecule is described by a tight-binding model whose first and last site is coupled to a respective lead. The leads are eliminated within a perturbation theory yielding a master equation for the wire. The decomposition into a Floquet basis enables an efficient treatment of the driving field. For the electronic excitations in bridged molecular wires, we find that strong Coulomb repulsion significantly sharpens resonance peaks which broaden again with increasing temperature. By contrast, it has only a small influence on effects like non-adiabatic electron pumping and coherent current suppression.
PACS: 05.60.Gg – Quantum transport / 85.65.+h – Molecular electronic devices / 72.40.+w – Photoconduction and photovoltaic effects / 73.63.-b – Electronic transport in mesoscopic or nanoscale materials and structures
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
