Comparative study of interfacial strain dependent phonon localization in the beryllium-zinc chalcogenide superlattices

Assessment of optical phonons in BeTe, BexZn1-xTe, p-BeTe epilayers and BeTe/ZnTe/GaAs (001) superlattices

“…The simulations of R s (ω)/(T s (ω)) spectra in the s-polarization have identified, however, only the TO1 and TO2 modes. Our recent study of layer-dependent Raman intensity profiles in (BeTe)m/(ZnTe)n SLs [49] have substantiated the observation of confined…”

“…There exist two types of theoretical methods for assessing the structural and lattice dynamical properties of perfect/imperfect semiconductors. These are: (a) the microscopic methods [26][27][28][29][30][31][32][33][34][35][36][37][38] which start with ionic potentials screened by electron gas for gaining the optical, electronic, and phonon traits, and (b) the macroscopic techniques, which employ phenomenological models [39][40][41][42][43][44][45][46][47][48][49] to simulate phonon and impurity-induced vibrational characteristics. In the former techniques, the interatomic forces of the perfect/imperfect materials are usually evaluated using self-consistent density functional theory (SC-DFT) [26][27][28][29][30][31][32][33][34][35][36][37][38] to comprehend the structural, optical, and phonon properties by employing an ABINIT software package.…”

“…The first-principles methods have offered not only accurate phonon properties of alloy semiconductors [26][27][28][29][30][31][32][33][34][35][36][37][38] but also facilitated assessing FIR reflectivity and Raman intensity profiles of perfect/imperfect GaN/AlN SLs [31][32]. As compared to the ab initio techniques, the benefits of using macroscopic methods for investigating the lattice dynamics of perfect/imperfect [39][40][41][42][43][44][45][46][47][48][49] semiconductors are quite discernable. Here we have adopted a macroscopic methodology of multilayer optics (cf.…”