Abstract
We examine the nonlinear magnetoresistance oscillations in a dc-biased high-mobility two-dimensional electron system irradiated by intense microwaves with a current-controlled balance-equation model for multi-photon-assisted magnetotransport. It is shown that the maxima/minima positions, particularly the oscillation period of the differential resistance as a function of the ratio of the microwave frequency $\ensuremath{\omega}$ to the cyclotron frequency ${\ensuremath{\omega}}_{c}$, strongly depend on the radiation intensity under a large bias dc current density. Theoretical predictions well reproduce the recent experimental findings by Khodas et al. [Phys. Rev. Lett. 104, 206801 (2010)], and support the multiphoton origin of these unusual magnetoresistance oscillations.
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