Bichromatic microwave-induced oscillatory differential-resistance in the high mobility GaAs/AlGaAs heterostructure system*

Microwave photo-excitation of the high mobility GaAs/AlGaAs samples has revealed interesting light-matter coupling properties, and many studies have been carried out to study the associated microwave-induced oscillatory magneto-resistance [1,2]. Here, we report on the oscillatory differential resistance that seems to follow the low-frequency monochromatic response at lower magnetic fields and high-frequency monochromatic response at higher magnetic fields [3]. The higher sensitivity in the differential resistivity served to examine the dependency of this oscillatory behavior where the difference of monochromatic and bichromatic results indicates a beats like relation with the magnetic field. This beat like behavior was further studied at different frequency ratios over the 40 < f < 102 GHz band while changing the microwave power systematically. The results of the study are reported here.
[1] R. G. Mani et al., Nature, 420, 646 (2002)
[2] Tianyu Ye, et.al, Phys. Rev. B 89, 155307 (2014).
[3] B. Gunawardana, et.al., Phys. Rev. B. 95, 195304 (2017).