Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-16
Physics
Condensed Matter
Strongly Correlated Electrons
3 Figures, Submitted
Scientific paper
Electron coupling to intra- and inter-molecular vibrational modes is investigated in models appropriate to single crystal organic semiconductors, such as oligoacenes. Focus is on spectral and transport properties of these systems beyond perturbative approaches. The interplay between different couplings strongly affects the temperature band renormalization that is the result of a subtle equilibrium between opposite tendencies: band narrowing due to interaction with local modes, band widening due to electron coupling to non local modes. The model provides an accurate description of the mobility as function of temperature: indeed, it has the correct order of magnitude, at low temperatures, it scales as a power-law $T^{-\delta}$ with the exponent $\delta$ larger than unity, and, at high temperatures, shows an hopping behavior with a small activation energy.
Cataudella Vittorio
Perroni C. A.
Ramaglia Vincenzo Marigliano
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