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Response functions and spectrum of collective excitations of fractional-quantum-Hall-effect systems
We calculate the electromagnetic response functions of a Fractional Quantum Hall system within the framework of the fermion Chern-Simons theory for the Fractional Hall Effect (FQHE) which we developed before. Our results are valid in a semiclassical expansion around the average field approximation (AFA). We reexamine the AFA and the …