Interchain conductivity of coupled Luttinger liquids and organic conductors

We reconsider the theory of dc and ac interchain conductivity in quasi-one dimensional systems. Our results are in good agreement with the measured c-axis optical conductivity of ${\mathrm{}\left(\mathrm{TMTSF}\right)\mathrm{}}_2{\mathrm{ClO}}_4$ and suggest that the c-axis dc conductivity of ${\mathrm{}\left(\mathrm{TMTSF}\right)\mathrm{}}_2{\mathrm{PF}}_6$ in the $150\hspace{0.5em}\mathrm{K}<T<\mathrm{}300\mathrm{}\hspace{0.5em}\mathrm{K}$ 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.