Phonon excitations of composite-fermion Landau levels

F. Schulze-Wischeler, Frank Hohls, U. Zeitler, D. Reuter, A.D. Wieck & Rolf J. Haug
The phonon excitations of fractional quantum Hall (FQH) states at filling factors ν =1÷3,2÷5, 4÷7, 3÷5, 4÷3, and 5÷3 were investigated. The excitations were found to be based on Landau-level transitions of composite fermions (CF). It was observed that at filling factor ν = 2÷3, a linear field dependence of the excitation energy in the high field regime showed a spin transition, which was excited by the phonons. All the transport gaps, except the one...
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