Modeling inelastic phonon scattering in atomic- and molecular-wire junctions

Details Modeling inelastic phonon scattering in atomic- and molecular-wire junctions Modeling inelastic phonon scattering in atomic- and molecular-wire junctions

2005-05-19

arxiv.org/abs/cond-mat/0505473v3

PRB 72, 201101(R), 2005

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.72.201101

Computationally inexpensive approximations describing electron-phonon scattering in molecular-scale conductors are derived from the non-equilibrium Green's function method. The accuracy is demonstrated with a first principles calculation on an atomic gold wire. Quantitative agreement between the full non-equilibrium Green's function calculation and the newly derived expressions is obtained while simplifying the computational burden by several orders of magnitude. In addition, analytical models provide intuitive understanding of the conductance including non-equilibrium heating and provide a convenient way of parameterizing the physics. This is exemplified by fitting the expressions to the experimentally observed conductances through both an atomic gold wire and a hydrogen molecule.

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