# Magneto-resistance oscillations induced by high-intensity terahertz radiation

## TL;DR

This study demonstrates that terahertz radiation induces magneto-resistivity oscillations in 2D electron systems, which remain robust at high intensities and exhibit saturation behavior influenced by radiation frequency.

## Contribution

It provides the first high-power investigation of MIRO in the terahertz range, revealing saturation effects and frequency dependence of the saturation intensity.

## Key findings

- MIRO persists at high radiation intensities up to 10^4 W/cm^2.
- MIRO amplitude saturates following an empirical law with intensity.
- Saturation intensity increases with radiation frequency from 0.6 to 1.1 THz.

## Abstract

We report on observation of pronounced terahertz radiation-induced magneto-resistivity oscillations in AlGaAs/GaAs two-dimensional electron systems, the THz analog of the microwave induced resistivity oscillations (MIRO). Applying high power radiation of a pulsed molecular laser we demonstrate that MIRO, so far observed at low power only, are not destroyed even at very high intensities. Experiments with radiation intensity ranging over five orders of magnitude from $0.1$ W/cm$^2$ to $10^4$ W/cm$^2$ reveal high-power saturation of the MIRO amplitude, which is well described by an empirical fit function $I/(1 + I/I_s)^\beta$ with $\beta \sim 1$. The saturation intensity Is is of the order of tens of W/cm$^2$ and increases by six times by increasing the radiation frequency from $0.6$ to $1.1$ THz. The results are discussed in terms of microscopic mechanisms of MIRO and compared to nonlinear effects observed earlier at significantly lower excitation frequencies.