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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Molecular electronics in junctions with energy disorder

Focus on Molecular Electronics

Franz J Kaiser1, Peter Hänggi and Sigmund Kohler

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Part of Focus on Molecular Electronics

We investigate transport through molecular wires whose energy levels are affected by environmental fluctuations. We assume that the relevant fluctuations are so slow that they, within a tight-binding description, can be described by disordered, Gaussian distributed onsite energies. For long wires, we find that the corresponding current distribution can be rather broad even for a small energy variance. Moreover, we analyse with a Floquet master equation the interplay of laser excitations and static disorder. Then the disorder leads to spatial asymmetries such that the laser driving can induce a ratchet current.


PACS

85.65.+h Molecular electronic devices

Subjects

Electronics and devices

Dates

Issue 6 (June 2008)

Received 31 March 2008

Published 30 June 2008



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