Coulomb blockade effects in driven electron transport

Details Coulomb blockade effects in driven electron transport Coulomb blockade effects in driven electron transport

2006-06-16

arxiv.org/abs/cond-mat/0606457v2

Eur. Phys. J. B 54, 201 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures. Added a plot for temperature dependence of resonance peaks. Published version

Scientific paper

10.1140/epjb/e2006-00439-7

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, Coulomb blockade has only a small influence on effects like non-adiabatic electron pumping and coherent current suppression.

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