Radiowave-Induced Resistance Oscillations

Microwave-induced resistance oscillations (MIROs) occur when a two-dimensional electron gas is subjected to radiation of frequency ω=2πf and varying magnetic field B. MIROs are periodic in 1/B, with the period determined by the radiation frequency ω, and their amplitude scales with the radiation power. Stepping from single-photon transitions between Landau levels, MIROs are found on the low-field side of the cyclotron resonance, ω_{c}≲ω, where ω_{c} is the cyclotron frequency. Here, we report on another class of magneto resistance oscillations, which are induced by high-intensity radiation in the radio frequency range and occur at ω_{c}≫ω. These oscillations are independent of frequency ω, they can be either 1/B or 1/B^{2} periodic, and their period is controlled by the radiation electric field. We further show that by using a displacement model in the limit of short-range ("sharp") disorder we can extract the radiation field and the width of the cyclotron resonance.