Magnetoluminescence study of a two-dimensional electron gas confined in diluted-magnetic-semiconductor quantum wells

We have carried out a photoluminescence study of an (Formula presented)-type modulation-doped (Formula presented) single quantum well structure (electron areal density (Formula presented)) in magnetic fields up to 30 T. In the presence of a magnetic field, the broad emission band in the vicinity of the gap evolves into a series of discrete features. These are attributed to interband transitions of electrons occupying Landau levels to photogenerated holes. The Landau transitions associated with both electron spin states (Formula presented) are clearly resolved due to the large electron and hole (Formula presented) factors exhibited by the magnetic wells. An analysis of the Landau-level occupation as a function of magnetic field yields the electron concentration.