Resonant spin-flip Raman scattering studies of II-VI semiconductor heterostructures

Spin-flip Raman scattering (SFRS) has been applied to the investigation of a range of wide band-gap II-VI heterostructures. In the ternary alloys ZnS_xSe_1-x and Zn_1-xMg_xSe, we have studied the dependence of the conduction band gyromagnetic ratio on composition and find that the data are described well by the predictions of five-band k · p theory: we have made similar predictions for the alloy system Zn_1-xCd_xSe. In the latter system, the fractional monolayer (FM) deposition of CdSe on ZnSe has made possible the formation of an inhomogeneous Zn_1-xCd_xSe alloy layer. We have studied SFRS in one such structure in resonance with excitons localized at the CdSe FM and have obtained a value for the electron gyromagnetic ratio which is equal to that of bulk ZnSe. We also obtain an estimate of a zero-field electron-hole exchange splitting of the exciton states of 0.68 meV which is 2.8 (5.2) times larger than that observed for bulk ZnSe (CdSe).