Polarization properties of multiple Mn2+-spin-flip Raman scattering in semimagnetic quantum wells

Abstract In a strongly anisotropic quantum well structure containing semimagnetic quantum wells of Cd 0.98 Mn 0.02 Te and nonmagnetic barriers of Cd 0.76 Mg 0.24 Te a large number of paramagnetic resonance Raman lines can be observed in Voigt-geometry due to collective multiple spin flips within the Zeeman split Mn 2+ ground state, especially close to resonance with the heavy hole dipole transitions of the narrowest quantum well. This effect exhibits interesting temperature dependent polarization properties. The polarization is also influenced by small Faraday-components of the external magnetic field. The experiments can be explained by a precession of the total spin of all Mn 2+ ions within the localization volume of a localized exciton in the sum of external and exchange field ( B ext ⊥ B exch , B exch produced by the heavy hole. The polarization properties are interpreted by a random distribution of Faraday-components of B ext due to undulations of the quantum well.