Quantum interference and decoherence in single-molecule junctions: how vibrations induce electrical current

Quantum interference and decoherence in single-molecule junctions is analyzed employing a nonequilibrium Green's function approach. Electrons tunneling through quasidegenerate states of a molecular junction exhibit interference effects. We show that electronic-vibrational coupling, inherent to...

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Bibliographic Details
Published in:Physical review letters 2011-07, Vol.107 (4), p.046802-046802, Article 046802
Main Authors: Härtle, R, Butzin, M, Rubio-Pons, O, Thoss, M
Format: Article
Language:English
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Summary:Quantum interference and decoherence in single-molecule junctions is analyzed employing a nonequilibrium Green's function approach. Electrons tunneling through quasidegenerate states of a molecular junction exhibit interference effects. We show that electronic-vibrational coupling, inherent to any molecular junction, strongly quenches such interference effects. This decoherence mechanism may cause significantly larger electrical currents and is particularly pronounced if the junction is vibrationally highly excited, e.g., due to inelastic processes in the resonant transport regime.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.107.046802