Influencing the conductance in biphenyl-like molecular junctions with THz radiation
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 {\phi} 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 {\phi}. A model based on the cos2{\phi} 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.
Keywords
Cite
@article{arxiv.1306.3872,
title = {Influencing the conductance in biphenyl-like molecular junctions with THz radiation},
author = {Matthias Hinreiner and Dmitry A. Ryndyk and Denis Usvyat and Thomas Merz and Martin Schütz and Klaus Richter},
journal= {arXiv preprint arXiv:1306.3872},
year = {2015}
}
Comments
9 pages, 10 figures, submitted to PSSb