Evolution of the linear-polarization-angle-dependence of the radiation-induced magnetoresistance-oscillations with microwave power

Abstract

We examine the role of the microwave power in the linear polarization angle dependence of the microwave radiation induced magnetoresistance oscillations observed in the high mobility GaAs/AlGaAs two dimensional electron system. Diagonal resistance R xx was measured at fixed magnetic fields corresponding to the photo-excited oscillatory extrema of R xx as a function of both the microwave power, P , and the linear polarization angle, θ. Color contour plots of such measurements demonstrate the evolution of the R xx versus θ line shape with increasing microwave power. We report that the non-linear power dependence of the amplitude of the radiation-induced magnetoresistance oscillations distorts the cosine-square relation between R xx and θ at high power.

Electron heating induced by microwave photoexcitation in the GaAs/AlGaAs two-dimensional electron system

“…1,5 At lower temperatures, moderate microwave intensity transforms the oscillatory minima into zero-resistance states. Interesting experimental features examined by experiment include the 1/4 cycle phase shift 1,5,8 , the non-linear increase in the amplitude of the radiation-induced oscillations with the microwave power 19,55 , observed correlations between the magnetoresistance oscillations and microwave reflection 8,25 from the 2DES, polarization sensitivity, 22,28,29,31 , and magnetoresistive response under bichromatic excitation. 10,42 .…”

Comparative study of microwave radiation-induced magnetoresistive oscillations induced by circularly- and linearly- polarized photo-excitation

“…Interesting experimental features revealed by prior studies in this field include: (a) the 1/4-cycle phase shift ref. 3 , 4 , (b) the non-linear increase in the amplitude of the radiation-induced oscillations with the microwave power 5 , (c) the sinusoidal dependence of the oscillation amplitude on the linear polarization angle 6 7 , (d) observed correlations between the magneto-resistance oscillations and the microwave reflection from 2DES 8 9 , and other fascinating phenomena 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 .…”

Millimeter wave radiation-induced magnetoresistance oscillations in the high quality GaAs/AlGaAs 2D electron system under bichromatic excitation

“…Transport at large filling factors have been a topic of interest, especially the microwave,-millimeter wave,-and terahertz,-radiation-induced zero-resistance states, 1,2 and the associated 1/4-cycle phase shifted radiation-induced magnetoresistance oscillations, 1,3,4,8,9,12,15,17,19,21,25 which refers to the B −1 -periodic oscillatory variation in the magnetoresistance observed under photoexcitation in the 2D electron system under the influence of a transverse magnetic field, B. Such oscillations exhibit a non-linear variation in the oscillatory amplitude with radiation power, 15,25,36 sensitivity in the oscillatory amplitude to the orientation of the linearly polarized radiation with respect to the device, 19,[25][26][27][28]35 etc. Many theoretical explanations have been proposed to help understand associated phenomena, [36][37][38][39][40][41][42][43][45][46][47][48][49][50][51][53][54][55][56][57][58][59]…”