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Transport properties, spectral function and optical conductivity of theadiabatic one-dimensional Su-Schrieffer-Heeger (SSH) model are studied withparticular emphasis on the model parameters suitable for Rubrene singlecrystals based field effect transistors. We show that the mobility, calculatedby using the Kubo formula for conductivity, vanishes unless we introduce an "adhoc" broadening of the system energy levels. Furthermore, the apparentcontradiction between angle resolved photoemission data and transportproperties is clarified by studying the behavior of the spectral function.Finally, a peak in the optical conductivity at very low energy is obtained anddiscussed in connection with the available experimental data for Rubrene baseddevices.

physical review. b, condensed matter and materials physics

Transport Properties and Optical Conductivity of the adiabatic  Su-Schrieffer-Heeger model: a showcase study for rubrene based field effect  transistors