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Physical Review B
We present a study of the dielectric response of ͑GaAs͒ p / ͑AlAs͒ p (001) superlattices in a wide range of barrier and well widths. We applied density functional theory and a semiempirical method to obtain the superlattice band structures. These were then used as a starting point to evaluate the optical spectra and macroscopic dielectric constants using time-dependent density functional theory. In this context, we investigated the role of crystal local field effects in determining thedoi:10.1103/physrevb.70.045301 fatcat:6qehxtyn3zgihjjng67bmblsui