The microwave induced resistance response of a high mobility 2DEG from   the quasi-classical limit to the quantum Hall regime
  Microwave induced resistance oscillations (MIROs) were studied experimentally over a very wide range of frequencies ranging from ~20 GHz up to ~4 THz, and from the quasi-classical regime to the quantum Hall effect regime. At low frequencies regular MIROs were observed, with a periodicity determined by the ratio of the microwave to cyclotron frequencies. For frequencies below 150 GHz the magnetic field dependence of MIROs waveform is well described by a simplified version of an existing theoretical model, where the damping is controlled by the width of the Landau levels. In the THz frequency range MIROs vanish and only pronounced resistance changes are observed at the cyclotron resonance. The evolution of MIROs with frequency are presented and discussed. 
S. A. Studenikin, M. Byszewski, D. K. Maude, M. Potemski, A.   Sachrajda, Z. R. Wasilewski, M. Hilke, L. N. Pfeiffer, K. W. West