Pair Tunneling and shot noise through a single molecule in a strong electron-phonon coupling

TL;DR

This paper explores electron transport through a single molecule with strong electron-phonon coupling, highlighting pair tunneling phenomena, proposing experimental enhancements, and analyzing shot noise behavior.

Contribution

It introduces a particle-hole transformation suitable for non-equilibrium conditions to treat pair tunneling and cotunneling equally, and proposes an experimental setup to observe pair tunneling without Franck-Condon suppression.

Findings

Pair tunneling can be enhanced and observed experimentally.

Shot noise characteristics reveal unique transport features.

Theoretical framework unifies tunneling processes in strong coupling regimes.

Abstract

We investigate the electronic transport through a single molecule in a strong electron-phonon coupling regime. Based on a particle-hole transformation which is made suitable for non-equilibrium situation, we treat the pair tunneling and cotunneling on an equal footing. We propose an experimental setup to enhance the visibility of pair tunneling, which has no Franck-Condon suppression. We also discuss the shot noise characteristics.