Length and temperature dependent crossover of charge transport across molecular junctions

Details Length and temperature dependent crossover of charge transport across molecular junctions Length and temperature dependent crossover of charge transport across molecular junctions

2011-03-09

arxiv.org/abs/1103.1708v2

Phys. Rev. B 84, 075106 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 10 figures

Scientific paper

10.1103/PhysRevB.84.075106

We study the electronic transport in a molecular junction in which each site is coupled to a local phonon bath using the non-equilibrium Green's function method. We observe the length period of the oscillatory conductance in odd-numbered chains depends strongly on the applied bias, and the oscillatory behavior is smeared out for the bias voltage near the phonon energy. In addition, a crossover from tunneling to thermally activated hopping transport as the length of the molecule increases is found for the phonon-free case. In the presence of electron-phonon interaction, hopping transport is dominant and a transition from the thermally suppressed to assisted conduction is observed.

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