Non-linear magnetotransport in microwave-illuminated two-dimensional electron systems

TL;DR

This paper investigates how microwave and dc electric fields influence magnetoresistivity oscillations in high-mobility two-dimensional electron systems, revealing the role of scattering processes and specific oscillation behaviors.

Contribution

It provides a comprehensive analysis of magnetotransport under combined microwave and dc fields, identifying conditions for resistivity extrema and the significance of microwave-induced scattering.

Findings

Oscillation amplitude is periodic in inverse magnetic field.

Suppression of oscillations near half-integers of cyclotron frequency.

Conditions for resistivity extrema and saddle points are established.

Abstract

We study magnetoresistivity oscillations in a high-mobility two-dimensional electron system subject to both microwave and dc electric fields. First, we observe that the oscillation amplitude is a periodic function of the inverse magnetic field and is strongly suppressed at microwave frequencies near half-integers of the cyclotron frequency. Second, we obtain a complete set of conditions for the differential resistivity extrema and saddle points. These findings indicate the importance of scattering without microwave absorption and a special role played by microwave-induced scattering events antiparallel to the electric field.