Phonon-assisted current noise in molecular junctions

Details Phonon-assisted current noise in molecular junctions Phonon-assisted current noise in molecular junctions

2009-03-12

arxiv.org/abs/0903.2268v2

Phys. Rev. Lett. 103, 136601 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures; updated version

Scientific paper

10.1103/PhysRevLett.103.136601

We investigate the effects of phonon scattering on the electronic current noise through nanojunctions using the non-equilibrium Green's functions formalism extended to include the counting field. In the case of weak electron-phonon coupling and a single broad electronic level we derive an analytic expression for the current noise at arbitrary temperature and identify physically distinct contributions based on their voltage dependence. We apply our theory to the experimentally relevant case of a deuterium molecule placed in a break-junction and predict a significant inelastic contribution to the current noise.

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