Current-induced nonequilibrium vibrations in single-molecule devices

Details Current-induced nonequilibrium vibrations in single-molecule devices Current-induced nonequilibrium vibrations in single-molecule devices

2005-04-05

arxiv.org/abs/cond-mat/0504095v2

Phys. Rev. B 73, 155306 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures; revised and extended version published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.155306

Finite-bias electron transport through single molecules generally induces nonequilibrium molecular vibrations (phonons). By a mapping to a Fokker-Planck equation, we obtain analytical scaling forms for the nonequilibrium phonon distribution in the limit of weak electron-phonon coupling $\lambda$ within a minimal model. Remarkably, the width of the phonon distribution diverges as $\sim\lambda^{-\alpha}$ when the coupling decreases, with voltage-dependent, non-integer exponents $\alpha$. This implies a breakdown of perturbation theory in the electron-phonon coupling for fully developed nonequilibrium. We also discuss possible experimental implications of this result such as current-induced dissociation of molecules.

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