CHARGING EFFECTS IN QUANTUM WIRES

We investigate the role of charging effects in a voltage-biased quantu m wire. Both the finite range of the Coulomb interaction and the long- ranged nature of the Friedel oscillation imply a finite capacitance, l eading to a charging energy. While observable Coulomb blockade effects are absent for a single impurity, they are crucial if islands are pre sent. For a double barrier, we give the resonance condition, fully tak ing into account the charging of the island.