Microwave-induced electron heating in the regime of radiation-induced magnetoresistance oscillations

TL;DR

This study investigates how microwave radiation affects electron behavior in a two-dimensional semiconductor system, finding minimal heating effects and confirming theoretical predictions about electron temperature stability under microwave exposure.

Contribution

It provides experimental evidence that microwave photoexcitation causes negligible electron heating in a 2D electron system within specific magnetic field regimes.

Findings

Microwave power has a weak effect on SdH oscillation amplitude.

Electron heating under modest microwave excitation is negligible.

Results agree with theoretical predictions of electron temperature stability.

Abstract

We examine the influence of microwave photoexcitation on the amplitude of Shubnikov-de Haas (SdH) oscillations in a two dimensional GaAs/AlGaAs electron system in a regime where the cyclotron frequency, $\omega_{c}$, and the microwave angular frequency, $\omega$, satisfy $2 \omega \le \omega_{c} \le 3.5 \omega$. A SdH lineshape analysis indicates that increasing the incident microwave power has a weak effect on the amplitude of the SdH oscillations, in comparison to the influence of modest temperature changes on the dark-specimen SdH effect. The results indicate negligible electron heating under modest microwave photoexcitation, in good agreement with theoretical predictions.