Coulomb repulsion effects in driven electron transport |
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Authors: | F J Kaiser P Hänggi S Kohler |
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Institution: | 1. Institut für Physik, Universit?t Augsburg, Universit?tsstra?e?1, 86135, Augsburg, Germany
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Abstract: | 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. |
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Keywords: | 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 |
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