Density matrix for a mesoscopic current ribbon

Abstract

We consider an ideal mesoscopic ribbon in which a steady azimuthal current is generated. We show that the closed interacting electron system in the presence of the current is described by a density matrix which is that of an equilibrium system without current but with a constrained Hamiltonian.

11 pages, no figures. RevTeX 3.0 (UCF-CM-93-007)