Doublet structure of emission spectra from fractional quantum Hall states

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Abstract
A suppression of the exciton dispersion by an incompressible quantum liquid strongly affects the recombination emission spectrum. It comprises two parts; one of them originates from a direct recombination of k=0 excitons, and the other from indirect, single magnetoroton, transitions from an extensive area in k space, kl≊1, l is the magnetic length. Intensities of the peaks show opposite temperature dependencies. We show that the minimal frequency of magnetorotons may be found from emission spectra by a proper treatment of experimental data.