Optical properties of nonequilibrium low-dimensional systems

The optical properties of low-dimensional carrier systems (''quantum wire" type) driven away from equilibrium are studied. The frequency and wave-vect or-dependent dielectric function of a quasi-one-dimensional electron system under the action of an;exciting external pumping source is derived. The op tical responses of the system are obtained in terms of its nonequilibrium t hermodynamic state, the latter characterized resorting to a nonequilibrium statistical ensemble formalism.