Abstract
In terms of a long-wavelength optical response theory, we have analysed the far-infrared reflectivity spectra of Cd 1− x Mn x Te ternary alloys and predicted s- and p-polarized reflectance in CdTe/Cd 1− x Mn x Te thick multiple heterostructures. Lattice dynamics of bulk cubic CdTe, MnTe; folded phonons and anisotropy of optical modes in CdTe/Cd 1− x Mn x Te [0 0 1] SLs are investigated using a realistic rigid-ion-model (RIM). The short-range forces in CdTe and MnTe materials are optimized by incorporating neutron scattering and transformed Raman data of phonons and elastic constants. The long-range Coulombic forces are evaluated exactly by Ewald summation method. In CdTe/Cd 1− x Mn x Te SLs, the influence of composition and disorder in Cd 1− x Mn x Te ternary alloys is described within a modified random-element iso-displacement scheme generalized to layered structures with arbitrary wavevectors and composition profiles. Theoretical results are compared and discussed with the existing far infrared and Raman scattering data.
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