Quantum Interference and Decoherence in Single-Molecule Junctions: How Vibrations Induce Electrical Current

Details Quantum Interference and Decoherence in Single-Molecule Junctions: How Vibrations Induce Electrical Current Quantum Interference and Decoherence in Single-Molecule Junctions: How Vibrations Induce Electrical Current

2011-02-21

arxiv.org/abs/1102.4190v1

Phys. Rev. Lett. 107, 046802 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.046802

Quantum interference effects and decoherence mechanisms in single-molecule junctions are analyzed employing a nonequilibrium Green's function approach. Electrons tunneling through quasi-degenerate states of a nanoscale molecular junction exhibit interference effects. We show that electronic-vibrational coupling, inherent to any molecular junction, strongly quenches such interference effects. As a result, the electrical current can be significantly larger than without electronic-vibrational coupling. The analysis reveals that the quenching of quantum interference is particularly pronounced if the junction is vibrationally highly excited, e.g. due to current-induced nonequilibrium effects in the resonant transport regime.

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