Abstract
We have studied the band-edge photoluminescence from two n-type modulation-doped ZnSe/${\mathrm{Zn}}_{\mathrm{x}}$${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$Se single quantum-well structures with electron areal densities of 1.1\ifmmode\times\else\texttimes\fi{}${10}^{12}$ and 1.9\ifmmode\times\else\texttimes\fi{}${10}^{12}$${\mathrm{fcm}}^{\mathrm{\ensuremath{-}}2}$ in magnetic fields up to 30 T. The sharp excitonic transitions observed in undoped samples are replaced by a broad luminescence band. In a magnetic field, the luminescence spectra consist of distinct features associated with interband transitions between electrons occupying the conduction-band Landau levels and photoexcited holes. The energies of these transitions exhibit anomalies for even filling factors due to many-body effects.
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