Electron localization in quasi-one-dimensional organic conductors

The theory of electron localization in quasi-one-dimensional organic conductors is reviewed in detail. The effective diagram technique to take into account strong scattering and commensurability effects is developed using the Berezinsky method. The singularities of the electron density of states, of the localization length and of the static dielectric constant near the middle of the electron band and near other rational points of the band are discussed. A transition similar to the Anderson transition is found near the band edge. The effects of the electron-phonon interaction are taken into account and exact results for the hopping conductivity are obtained. The experimental data on the electrical and optical properties of TCNQ salts with strong structural disorder and of other quasi-1d organic conductors are reviewed and analysed.