Ionic plasma screening and long-range electron correlations in quasi-one-dimensional conductors

In quasi-one-dimensional systems with the intercalation-type doping, the dynamical response of dopant ions can substantially affect the interplay of density-wave and superconducting instabilities. A generic model system of Coulombically coupled Luttinger-liquid chains augmented by the interaction with the ion displacements is exactly solved in the forward-scattering channel providing for the resulting system excitations and electron correlations. For a jellium-like ion response, the effect of the bare electron-electron repulsion is essentially canceled by the ions. Superconducting correlations can then be developed due to a non-polarizational interaction with an additional phonon mode.