Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-07-08
Phys. Rev. B 84, 085433 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To be published in PRB
Scientific paper
10.1103/PhysRevB.84.085433
We study the effect of electron-vibron interactions on the inelastic transport properties of single-molecule nanojunctions. We use the non-equilibrium Green's functions technique and a model Hamiltonian to calculate the effects of second-order diagrams (double-exchange DX and dressed-phonon DPH diagrams) on the electron-vibration interaction and consider their effects across the full range of parameter space. The DX diagram, corresponding to a vertex correction, introduces an effective dynamical renormalization of the electron-vibron coupling in both the purely inelastic and the inelastic-resonant features of the IETS. The purely inelastic features correspond to an applied bias around the energy of a vibron, while the inelastic-resonant features correspond to peaks (resonance) in the conductance. The DPH diagram affects only the inelastic resonant features. We also discuss the circumstances in which the second-order diagrams may be approximated in the study of more complex model systems.
Dash L. K.
Godby R. W.
Ness H.
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