Radiation-induced magnetoresistance oscillations in two-dimensional electron systems

We carry out a systematic analysis on radiation induced magnetoresistance oscillations (RIMOs) in high-mobility two-dimensional electron gas (2DEG), based on the balance-equation approach to magnetotransport developed for high-carrier-density systems. The model covers regimes of both inter- and intra-Landau level processes, takes full account of multiphoton-assisted electron transitions as well as radiation-induced change of the electron distribution, and naturally includes electrodynamic damping. Electron scatterings by impurities, transverse and longitudinal acoustic phonons as well as polar optic phonons are considered in GaAs-based heterosystems with realistic scattering potentials. This theoretical model not only reproduces the main features of RIMOs, predicts the appearance of the measured zero resistance, but also explains the other prominent experimental observations.