Theory of the oscillatory photoconductivity of a two-dimensional electron system

We develop a theory of magnetooscillations in the photoresistivity of a two-dimensional electron gas observed in recent experiments. According to our theory, the effect is governed by a change of the electron distribution function induced by the microwave radiation. We analyze a nonlinearity with respect to both the DC field and the microwave power, as well as the temperature dependence determined by the inelastic relaxation rate.