Vibrationally mediated control of single-electron transmission in weakly coupled molecule-metal junctions

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Abstract

We propose a mechanism which allows one to control the transmission of single electrons through a molecular junction. The principle utilizes the emergence of transmission sidebands when molecular vibrational modes are coupled to the electronic state mediating the transmission. We will show that if a molecule-metal junction is biased just below a molecular resonance, one may induce the transmission of a single electron by externally exciting a vibrational mode of the molecule. The analysis is quite general but requires that the molecular orbital does not hybridize strongly with the metallic states. As an example we perform a density-functional theory analysis of a benzene molecule between two Au(111) contacts and show that exciting a particular vibrational mode can give rise to transmission of a single electron.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Volume81
Issue number11
Pages (from-to)115443
ISSN0163-1829
DOIs
Publication statusPublished - 2010

Bibliographical note

Copyright 2010 American Physical Society

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