title: Coulomb interaction and quantum transport through a coherent scatterer.
abstract: An interplay between charge discreteness, coherent scattering, and Coulomb interaction yields nontrivial effects in quantum transport. We derive a real-time effective action and an equivalent quantum Langevin equation for an arbitrary coherent scatterer and evaluate its current-voltage characteristics in the presence of interactions. Within our model, at large conductances G0 and low T (but outside the instanton-dominated regime), the interaction correction to G0 saturates and causes conductance suppression by a universal factor which depends only on the type of the conductor.
authors.affiliation: Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe, Germany.
authors.forename: D S
authors.initials: DS
authors.lastname: Golubev
authors.forename: A D
authors.initials: AD
authors.lastname: Zaikin