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arXiv · 1306.3872

Influencing the conductance in biphenyl-like molecular junctions with THz radiation

Matthias Hinreiner·Dmitry A. Ryndyk·Denis Usvyat·Thomas Merz·Martin Schütz·Klaus Richter
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Abstract

We investigate the torsional vibrations in biphenyl-like molecular junctions and transport properties in the presence of an external THz field. Ab-initio calculations including external electric fields show that the torsional angle ϕ of a thiolated biphenyl junction exhibits virtually no response. However, if functional groups are added to the molecule, creating a dipole moment in each of the rings, an external field becomes more effective for changing ϕ. A model based on the cos2ϕ dependence of the current is proposed for the biphenyl-like molecular junctions in presence of an external THz field including 2,2'-bipyridine, 3,3'-bipyridine and 2,2',4,4'- tetramethyl-3,3'-bipyridine. The current through these molecules is shown to change if the THz frequency gets in resonance to the torsional vibration mode.

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Matthias Hinreiner, Dmitry A. Ryndyk, Denis Usvyat, Thomas Merz, Martin Schütz, Klaus Richter. 2013-06-17. Influencing the conductance in biphenyl-like molecular junctions with THz radiation. https://doi.org/10.1002/pssb.201349221

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