We consider the nonequilibrium quantum vibrations of a molecule clamped between two macroscopic leads in a current-carrying state at finite voltages. Our approach is based on the nonequilibrium Green function technique and the self-consistent Born approximation. Kinetic equations for the average populations of electrons and vibrons are formulated in the weak electron-vibron coupling case and self-consistent solutions are obtained. The effects of vibron emission and vibronic instability are demonstrated using few-orbital models. The importance of the electron-vibron resonance is shown.
@article{arxiv.cond-mat/0508143,
title = {Nonequilibrium excitations of molecular vibrons},
author = {D. A. Ryndyk and M. Hartung and G. Cuniberti},
journal= {arXiv preprint arXiv:cond-mat/0508143},
year = {2007}
}