We present an atomistic theory of electronic transport through single organic
molecules that reproduces the important features of the current-voltage
characteristics observed in recent experiments. We trace these features to
their origin in the electronic structure of the molecules and their local
atomic environment. We demonstrate how conduction channels arise from the
molecular orbitals and elucidate which specific properties of the individual
orbitals determine their contribution to the current.Comment: Revtex4, 4 pages, 4 figures. Version with color figures in
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