Vibrational effects on low-temperature properties of molecular conductors

Details Vibrational effects on low-temperature properties of molecular conductors Vibrational effects on low-temperature properties of molecular conductors

2007-04-16

arxiv.org/abs/0704.1973v1

Physica B 403, 1484 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

2 pages, 3 figures, to be presented on "The International Conference on Strongly Correlated Electron Systems" SCES'07, May 13-

Scientific paper

10.1016/j.physb.2007.10.170

We calculate characteristic correlation functions for the Anderson model with additional phonon-assisted coupling to the odd conduction channel. This model describes, for example, the behavior of a molecule embedded between two electrodes in linear transport experiments where the position of the molecule with respect to the leads affects the tunneling amplitudes. We use variational projection-operator method and numerical renormalization group (NRG) method. The spin is Kondo screened either by even or odd conduction channel depending on the gate voltage and electron-phonon coupling. However, in all regimes the gate-voltage dependence of the zero temperature conductance is found to be qualitatively the same as in the model with no coupling to the vibrational mode.

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