We report resonant spin-flip Raman scattering measurements in CdTe/Cd 1Ϫx Mg x Te single quantum wells with xϭ0.15, 0.26, and 0.5 as well as in Cd 1Ϫx Mg x Te alloys with xϭ0, 0.15, and 0.5. Effective g factors of electrons and heavy holes are measured as a function of the quantum well width (18Ϫ100 Å͒ and the angle of the magnetic field with respect to the growth axis. The electron g factors in quantum wells are between the values for bulk CdTe (g e ϭϪ1.644Ϯ0.005) and Cd 0.85 Mg 0.15 Te (g e ϭϪ0.802Ϯ0.005). We show that the change in the energy gap induced by the quantum confinement of the carriers provides the dominant contribution to the electron g factor in quantum wells. A large g factor anisotropy for conduction electrons is observed. It is shown that this anisotropy depends on the splitting between light-and heavy-hole states. The experimentally determined g factors are in good agreement with theoretical predictions. ͓S0163-1829͑97͒06128-6͔
We have investigated the lattice dynamics of a wurtzite GaN single crystal by inelastic x-ray scattering. Several dispersion branches and phonons at high-symmetry points have been measured, including the two zone-center Raman-and infrared-inactive silent modes. The experiments have been complemented by ab initio calculations. They are in very good agreement with our measurements, not only for phonon energies, but also for scattering intensities, thus validating the correctness of the eigenvectors. Other phenomenological and ab initio theories exhibit significant differences.
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