Dressed tunneling approximation for electronic transport through molecular transistors
Abstract
A theoretical approach for the nonequilibrium transport properties of nanoscale systems coupled to metallic electrodes with strong electron-phonon interactions is presented. It consists of a resummation of the dominant Feynman diagrams from the perturbative expansion in the coupling to the leads. We show that this scheme eliminates the main pathologies found in previous simple analytical approaches for the polaronic regime. The results for the spectral and transport properties are compared with those from several other approaches for a wide range of parameters. The method can be formulated in a simple way to obtain the full counting statistics. Results for the shot and thermal noise are presented.
- Publication:
-
Physical Review B
- Pub Date:
- February 2014
- DOI:
- 10.1103/PhysRevB.89.085412
- arXiv:
- arXiv:1402.0386
- Bibcode:
- 2014PhRvB..89h5412S
- Keywords:
-
- 73.63.-b;
- 71.38.-k;
- 72.70.+m;
- Electronic transport in nanoscale materials and structures;
- Polarons and electron-phonon interactions;
- Noise processes and phenomena;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 11 pages, 11 figures. Accepted for publication in Physical Review B