Abstract
In this paper, we show that electron-plasmon interactions play a critical role in resonant charge transfer in molecular tunnel junctions (MTJs). Only when such interactions are taken into account, does it become possible to obtain the correct values of the turn-on threshold voltage in the current-voltage characteristics observed in experiment. In addition, we predict the emission of photons from MTJs with a large quantum yield $\ensuremath{\sim}{10}^{\ensuremath{-}2}$ as a result of the excitation of surface plasmons upon the application of a voltage across the junction. Finally, we discuss physical conditions, which are necessary for the experimental observation of this phenomenon.
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