  We present a theoretical model in which the existence of radiation-induced
zero-resistance states is analyzed. An exact solution for the harmonic
oscillator wave function in the presence of radiation, and a perturbation
treatment for elastic scattering due to randomly distributed charged
impurities, form the foundations of our model. Following this model most
experimental results are reproduced, including the formation of resistivity
oscillations, their dependence on the intensity and frequency of the radiation,
temperature effects, and the locations of the resistivity minima. The existence
of zero-resistance states is thus explained in terms of the interplay of the
electron MW-driven orbit dynamics and the Pauli exclusion principle.
