Many-body effects on the transport properties of single-molecule devices.
The conductance through a molecular device including electron-electron and electron-phonon interactions is calculated using the numerical renormalization group method. At low temperatures and weak electron-phonon coupling the properties of the conductance can be explained in terms of the standard Kondo model with renormalized parameters. At large electron-phonon coupling a charge analog of the Kondo effect takes place that can be mapped into an anisotropic Kondo model. In this regime the molecule is strongly polarized by a gate voltage which leads to rectification in the current-voltage characteristics of the molecular junction.
Cornaglia
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CEA-Saclay, DSM/DRECAM/SPCSI, Gif sur Yvette, France.
Ness
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Grempel
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