Magneto-optics of charged excitons in ZnSe/ZnMgSSe quantum wells

We report magneto-optical studies of ZnSe/(Zn,Mg)(S,Se) quantum wells with n-type modulation doping. Polarized photoluminescence and spin-flip Raman s cattering spectroscopy is used to investigate the energy and spin structure of neutral and negatively charged excitons. The binding energy of charged excitons changes very little in magnetic fields up to 15 T. An inverted pop ulation of neutral exciton spin sublevels is found in magnetic fields; it i s associated with the spin-dependent formation of charged excitons. (C) 200 0 Published by Elsevier Science B.V. All rights reserved.