Two Types of Microwave-Induced Magnetoresistance Oscillations in a 2D Electron Gas at Large Filling Factors

TL;DR

This study investigates how microwave radiation affects magnetoresistance oscillations in a high-mobility 2D electron gas, revealing two distinct oscillation types influenced by frequency and power, explained by photon-assisted transport and Zener tunneling.

Contribution

It identifies and characterizes two types of microwave-induced magnetoresistance oscillations in a 2D electron gas at large filling factors, providing a qualitative explanation for their origin.

Findings

Two series of oscillations observed under microwave radiation.

Oscillation periods depend on microwave frequency and power.

Qualitative explanation via photon-assisted transport and Zener tunneling.

Abstract

The influence of microwave radiation (1.2-140 GHz) on resistance of high-mobility two-dimensional electron gas in GaAs quantum wells is studied. Two series of microwave-induced magnetoresistance oscillations periodic in 1/B were observed under microwave radiation. The periods of oscillations are determined by the microwave frequency and power, correspondingly. The experimental data is qualitatively explained by photon-assisted transport and Zener tunneling between Landau orbits.