Kukushkin, I. V. and Smet, J. H. and Schuh, Dieter and Wegscheider, Werner and Klitzing, Klaus von
Dispersion of the Composite-Fermion Cyclotron-Resonance Mode.
Physical Review Letters 98 (6), 066403.
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 108 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.