dc transport in quantum wires

The influence of the electron-electron interaction on the two-terminal de conductance of one-dimensional quantum wires is studied. A cancelation between the effect of the electron-electron interaction on the current and on the external electric field is the reason for the universal value, e(2)/<2 pi(h)over bar> per mode, of the de conductance of a clean wire. The effect of the renormalization of the electric field on the de conductance in the presence of an interplay between the electron-electron interaction and backward scattering due to an impurity is considered.