Electron kinetics in isolated mesoscopic rings driven out of equilibrium

Kinetic theory of nonlinear current response to an external field is developed for mesoscopic normal metal rings threaded by a magnetic flux. General expressions for direct current (dc) are derived for a nonequilibrium regime. These expressions describe simultaneously a contribution to dc made by a nonequilibrium (external) field, as well as the contribution caused by interaction with intrinsic fields. Contributions of electron-electron and electron-phonon interactions to the direct current in a nonequilibrium systems are estimated. The kinetic equation for electrons in a pumped disordered metal ring is solved with taking into account the Coulomb and electron-phonon interactions. This gives an estimate of an overheating of the pumped electron system.