Giant magnetoresistance oscillations caused by cyclotron resonance harmonics

TL;DR

This paper investigates giant magnetoresistance oscillations in high-mobility 2D electrons under microwave radiation, combining experimental observations with a theoretical model based on nonequilibrium Landau level occupation.

Contribution

It introduces a new model explaining giant magnetoresistance oscillations caused by cyclotron resonance harmonics in high-mobility 2D electron systems.

Findings

Observation of nearly zero resistance in oscillation minima

Agreement between experimental data and the proposed model

Identification of cyclotron resonance harmonics as the oscillation cause

Abstract

For high-mobility two-dimensional electrons at a GaAs/AlGaAs heterojunction, we have studied, both experimentally and theoretically, the recently discovered giant magnetoresistance oscillations with nearly zero resistance in the oscillation minima which appear under microwave radiation. We have proposed a model based on nonequilibrium occupation of Landau levels caused by radiation which describes the oscillation picture.