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We study microwave photoresistivity oscillations in a high mobilitytwo-dimensional electron system subject to strong dc electric fields. We findthat near the second subharmonic of the cyclotron resonance the frequency ofthe resistivity oscillations with dc electric field is twice the frequency ofthe oscillations at the cyclotron resonance, its harmonics, or in the absenceof microwave radiation. This observation is discussed in terms of themicrowave-induced sidebands in the density of states and the interplay betweendifferent scattering processes in the separated Landau level regime.

Microwave Photoresistance in dc-driven 2D Systems at Cyclotron Resonance Subharmonics