Gyromagnetic ratios of electrons confined in quantum wells in ZnSe/ZnxMg1-xSySe1-y heterostructures

oThe gyromagnetic ratios (g values) of electrons in ZnSe quantum wells with ZnxMg1-xSySe1-y barriers have been determined by resonance spin-Rip Raman scattering as functions of well width and of the direction of the applied m agnetic field. These heterostructures provide an excellent test of k.p pert urbation theories since there is both a large penetration of the electron w ave function into the barrier and a considerable difference in the light-ho le and heavy-hole confinement energies in the well. The former leads to exp osure of the electron to a region in which the spin-orbit coupling is signi ficantly reduced, while the latter introduces a marked anisotropy in the g tensor. The behavior of the g tensor as the well width is decreased is desc ribed very well by simple analytic expressions obtained from three-band k.p theory, excellent agreement with experiment being obtained with a 10% cond uction band offset ratio.