We present a new scheme to study the linear response of crystals which combines the advantages of the dielectric-matrix and supercell (``direct'') approaches yet avoids many of their drawbacks. The numerical complexity of the algorithm is of the same order as that of a self-consistent calculation for the unperturbed system. The method is not restricted to local perturbations as the dielectric-matrix one nor to short wavelengths as the direct one. As an application, we calculate the long-wavelength optical phonons in Si and GaAs, both transverse and longitudinal, using norm-conserving pseudopotentials, and without any use of supercells.
Using diagrammatic Green's-function methods we investigate the criterion for the localization of an electromagnetic wave in a dielectric medium containing randomly distributed m...
The linear and nonlinear (χ (2) ) optical responses of Langmuir monolayers of organically functionalized silver quantum dots were measured as a continuous function of interparti...
We study theoretically the transmission of radiation through superlattices of finite length, where the dielectric constant of one film in each unit cell contains a term linear i...
The fourth edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968. All material has been thoroug...
Abstract The optical constants of amorphous Ge are determined for the photon energies from 0.08 to 1.6 eV. From 0.08 to 0.5 eV, the absorption is due to k ‐conserving transition...
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