Non-linear Magnetoresistance Oscillations in Intensely Irradiated Two-Dimensional Electron Systems Induced by Multi-Photon Processes

TL;DR

This study investigates nonlinear magnetoresistance oscillations in 2D electron systems caused by intense microwave radiation, highlighting multi-photon processes and providing a model to determine microwave intensity.

Contribution

It introduces a quantum kinetic model explaining nonlinear oscillations due to multi-photon processes at high microwave power in 2D electron systems.

Findings

Oscillations depend on microwave frequency and intensity.

Theoretical model accurately describes observed phenomena.

Method to determine microwave intensity on electrons.

Abstract

We report on magneto-oscillations in differential resistivity of a two-dimensional electron system subject to intense microwave radiation. The period of these oscillations is determined not only by microwave frequency but also by its intensity. A theoretical model based on quantum kinetics at high microwave power captures all important characteristics of this phenomenon which is strongly nonlinear in microwave intensity. Our results demonstrate a crucial role of the multi-photon processes near the cyclotron resonance and its harmonics in the presence of strong dc electric field and offer a unique way to reliably determine the intensity of microwaves acting on electrons.