Charged excitons of composite fermions in the fractional quantum Hall effect

Charged excitons of composite fermions (CFs) are considered in the fractional quantum Hall effect. Energies of the charged CF excitons are computed at ν=1/3 as a function of the size of exciton. Our study suggests that the charged CF exciton with the size of a roton is lower in energy than the unbound state of a neutral roton and a lone charge. Therefore, we propose that the lowest-energy excitation of the fractional quantum Hall effect is in fact due to the charged excitons of composite fermions composed of two CF-particles and one CF-hole. The experimental relevance of the charged excitons of composite fermions is explored in the context of the resonant inelastic light scattering experiments.