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We report on theoretical studies of a recently discovered strongradiation-induced magnetoresistance spike obtained in ultracleantwo-dimensional electron systems at low temperatures. The most striking featureof this spike is that it shows up on the second harmonic of the cyclotronresonance and with an amplitude that can reach an order of magnitude largerthan the radiation-induced resistance oscillations. We apply theradiation-driven electron orbits model in the ultraclean scenario. Accordingly,we calculate the elastic scattering rate (charged impurity) which will definethe unexpected resonance spike position. We also obtain the inelasticscattering rate (phonon damping), that will be responsible of the large spikeamplitude. We present a microscopical model to explain the dependence of theLandau level width on the magnetic field for ultraclean samples. We find thatthis dependence explains the experimental shift of the resistance oscillationswith respect to the magnetic field found in this kind of samples. We study alsorecent results on the influence of an in-plane magnetic field on the spike. Weare able to reconcile the obtained different experimental response of bothspike and resistance oscillations versus an increasing in-plane field. The samemodel on the variation of the LL width, allows us to explain such surprisingresults based in the increasing disorder in the sample caused by the in-planedmagnetic field. Calculated results are in good agreement with experiments.These results would be of special interest in nanophotonics; they could lead tothe design of novel ultrasensitive microwave detectors.

Giant off-resonance resistance spike related phenomena in irradiated ultraclean two-dimensional electron systems