title: Theory of fractional microwave-induced resistance oscillations.
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.
authors.affiliation: Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany.
authors.forename: I A
authors.initials: IA
authors.lastname: Dmitriev
authors.forename: A D
authors.initials: AD
authors.lastname: Mirlin
authors.forename: D G
authors.initials: DG
authors.lastname: Polyakov