Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-10-29
Physica E 33(1), pp. 110 - 115 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 4 figures
Scientific paper
10.1016/j.physe.2005.11.016
Here we present theoretical studies of the effect of vibronic coupling on nonlinear transport characteristics (current-voltage and conductance-voltage) in molecular electronic devices. Considered device is composed of molecular quantum dot (with discrete energy levels) weakly connected to metallic electrodes (treated within the wide-band approximation), where molecular vibrations are modeled as dispersionless phonon excitations. Nonperturbative computational scheme, used in this work, is based on the Green's function theory within the framework of mapping technique (GFT-MT) which transforms the many-body electron-phonon interaction problem into a one-body multi-channel single-electron scattering problem. In particular, it is shown that quantum coherent transport of virtual polarons through the molecule can be a dominant factor justifying some well-known discrepancies between theoretical calculations and experimental results.
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