Microwave induced electron heating in the regime of radiation-induced magnetoresistance oscillations in the GaAs/AlGaAs system

We examine the influence of microwave photoexcitation on the amplitude of Shubnikov-de Haas (SdH) oscillations at large filling factors in a two dimensional GaAs/AlGaAs electron system. 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 at liquid Helium temperatures on the dark-specimen SdH effect. The results indicate negligible electron heating under modest microwave photoexcitation, in good agreement with theoretical predictions for this regime.