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Excitons in dense two-dimensional electron-hole magnetoplasmas.

We report clear excitonic effects in the optical spectra of neutral, dense magnetoplasmas in an In 0.53 Ga 0.47 As/InP quantum well at low temperatures. The observed suppression of the density dependence of the uppermost occupied (j e =j h =N) Landau-level transition energies in the range of filling factors N<v/2<N+1 is direct evidence that electrons and holes from the Nth Landau levels bind into magnetoexcitons. The effect disappears with increasing temperature