Theory of Fractional Microwave-Induced Resistance Oscillations
И. А. ДмитриевInstitut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, GermanyA. D. MirlinInstitut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, GermanyD. G. PolyakovInstitut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany
2007en
ABI
Abstract
We develop a systematic theory of microwave-induced oscillations in magnetoresistivity of a 2D electron gas in the vicinity of fractional harmonics of the cyclotron resonance, observed in recent experiments. We show that in the limit of well-separated Landau levels the effect is dominated by a change of the distribution function induced by multiphoton processes. At moderate magnetic field, a single-photon mechanism originating from the microwave-induced sidebands in the density of states of disorder-broadened Landau levels becomes important.
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