title: Dispersion of the composite-fermion cyclotron-resonance mode.
abstract: The dispersion of the composite-fermion cyclotron-resonance mode is measured with an optical detection scheme under the combined excitation of microwave radiation and a surface acoustic wave from an interdigital transducer. The slowly traveling surface wave defines the transferred wave vector. Momenta up to 10;{8} m;{-1} are accessible. The cyclotron-resonance mode exhibits strong negative dispersion, which suggests predominant short range residual interaction among composite fermions. From an extrapolation, the cyclotron mass at k=0 is obtained and investigated as a function of electron density.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
authors.forename: I V
authors.initials: IV
authors.lastname: Kukushkin
authors.forename: J H
authors.initials: JH
authors.lastname: Smet
authors.forename: D
authors.initials: D
authors.lastname: Schuh
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider
authors.forename: K
authors.initials: K
authors.lastname: von Klitzing