Two Types of Microwave-Induced Magnetoresistance Oscillations in a 2D   Electron Gas at Large Filling Factors
  The influence of microwave radiation (1.2-140 GHz) on resistance of high-mobility two-dimensional electron gas in GaAs quantum wells is studied. Two series of microwave-induced magnetoresistance oscillations periodic in 1/B were observed under microwave radiation. The periods of oscillations are determined by the microwave frequency and power, correspondingly. The experimental data is qualitatively explained by photon-assisted transport and Zener tunneling between Landau orbits. 
A. A. Bykov, A. V. Goran, D. R. Islamov, A. K. Bakarov, Jing-qiao   Zhang, and Sergey Vitkalov