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Abstract
Magnetoresistance oscillations in two-dimensional electron systems driven simultaneously by a strong direct current and a microwave irradiation are analyzed within a unified microscopic scheme treating both excitations on an equal footing. The microwave-induced resistance oscillations are described by a parameter ϵω proportional to the radiation frequency, while the dc-induced resistance oscillations are governed by a parameter ϵj proportional to the current density. In the presence of both a microwave radiation and a strong dc, the combined parameter ϵω+ϵj is shown to control the main resistance oscillations, in agreement with the recent measurement [Zhang et al., Phys. Rev. Lett. 98, 106804 (2007)].
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