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rf quantum Hall effect in a superlattice.

Helicon-wave propagation (rf Hall effect) in a model superlattice with a two-dimensional electron gas under quantum-Hall-effect conditions is studied in the framework of a Kronig-Penney-like dispersion relation. Numerical evidence for the occurrence of flat plateaus in the helicon resonance at low frequencies is presented. As the cyclotron frequency is approached, the plateaus are destroyed by the polarization and the displacement currents.