  Electron-plasmon interaction in a thin cylindrical wire is described in terms
of four-dimensional Kaluza-Klein theory in which angular coordinate of the
metal cylinder is considered to be one of the two compactified coordinates. In
this model electron-electron, electron-plasmon and nonlinear optical
plasmon-plasmon interactions are unified via introduction of effective
superchiral charges and fields. Such an approach has important consequences for
description of electromagnetic and transport properties of mesoscopic metallic
wires and rings at low temperatures, such as recent observation of
density-dependent spin polarization in quantum wires. This theory may be
consistently reformulated using normal language of classical physics as
nonlinear electrodynamics of a rotating medium.
