Molecular switching with strong electron-phonon interaction

We have shown that the attractive electron correlations caused by a strong electron-phonon interaction (EPI) in molecular quantum dots (MQDs) weakly coupled with the leads provide a switching effect, when the current-voltage characteristics show two branches with high and low current for the same voltage. Key features of polaronic correlated transport in degenerate MQDs are briefly reviewed fully taking into account both the Coulomb repulsion and EPI. Switching shows up when the effective interaction of polarons is attractive and the state of the dot is multiple degenerate