Interchain conductivity of coupled Luttinger liquids and organic conductors

We reconsider the theory of de and ac interchain conductivity in quasi-one dimensional systems. Our results are in good agreement with the measured c-axis optical conductivity of (TMTSF)(2)ClO4 and suggest that the c-axis de conductivity of (TMTSF)(2)PF6 in the 150 K<T<300 K range is dominated by precursor effects of Mott localization. The crossover from a Luttinger liquid at high energy to a Fermi liquid at low energy is also addressed, within a dynamical mean-field theory. Implications for the interchain resistivity and Drude weight in the Fermi liquid regime are discussed.