AC transport and full-counting statistics of molecular junctions in the weak electron-vibration coupling regime

A. Ueda, Y. Utsumi, Y. Tokura, O. Entin-Wohlman, A. Aharony

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The coupling of the charge carriers passing through a molecule bridging two bulky conductors with local vibrational modes of the molecule gives rise to distinct features in the electronic transport properties on one hand and to nonequilibrium features in the vibrations’ properties, e.g., their population, on the other. Here we explore theoretically a generic model for a molecular junction biased by an arbitrary dc voltage in the weak-coupling regime. We succinctly summarize parts of our past work related to the signature of the electron-vibration interaction on the full-counting statistics of the current fluctuations (i.e., the cumulant generating-function of the current correlations). In addition, we provide a novel account of the response to an ac field exerted on the junction (on top of the dc bias voltage); in particular, we study the nonequilibrium distribution and the displacement fluctuations of the vibrational modes. Remarkably, we find a behavior pattern that cannot be accounted for by classical forced oscillations. The calculations use the technique of nonequilibrium Green’s functions and treat the electron-vibration coupling in perturbation theory, within the random-phase approximation when required.

Original languageEnglish
Article number092313
JournalJournal of Chemical Physics
Volume146
Issue number9
DOIs
StatePublished - 7 Mar 2017

Funding

FundersFunder number
Japan Society for the Promotion of Science26400390, 6400390, 15K17432, 26220711
Israel Science Foundation
Ministry of Science and Technology, Israel3-11173

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