Abstract
We investigate the optical properties and the dielectric response of Al through self-consistent ab initio pseudopotential calculations. The frequency and wave-vector dependent dielectric function of Al is calculated for both the real and imaginary parts within the random-phase approximation. The accuracy of the calculations is tested using Kramers-Krönig relations and sum rules. In the limit q→0, we find major optical peaks at 0.5 and 1.5 eV, which originate from the electronic structure, in good agreement with experimental data. For the wave vectors along the [100] direction, the electron-energy-loss function is calculated to examine the plasmon mode. Considering the exchange-correlation and core polarization effects, we find good agreement of the calculated plasma frequencies with experiments. The anisotropy of the plasmon dispersion is also investigated.
- Received 28 July 1993
DOI:https://doi.org/10.1103/PhysRevB.49.2362
©1994 American Physical Society