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 magnetic field. These heterostructures provide an excellent test of k.p perturbation theories since there is both a large penetration of the electron wave function into the barrier and a considerable difference in the light-hole and heavy-hole confinement energies in the well. The former leads to exposure of the electron to a region in which the spin-orbit coupling is significantly 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 described very well by simple analytic expressions obtained from three-band k.p theory, excellent agreement with experiment being obtained with a 10% conduction band offset ratio.