Year: 1975
Type: article
Abstract: We have calculated the dielectric response matrix ${\ensuremath{\epsilon}}_{\stackrel{\ensuremath{\rightarrow}}{G},{\stackrel{\ensuremath{\rightarrow}}{G}}^{\ensuremath{'}}}(\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}=0, \ensuremath{\omega})$ for silicon and have obtained the macroscopic frequency-dependent dielectric function. Contrary to recent calculations, local-field corrections do not shift the prominent peak positions of the imaginary part of the dielectric function; further the calculated dielectric function is improved as compared with experiments at higher energies. In particular, agreement with measured energy-loss spectra is significantly better when local-field effects are included.
Source: Physical Review Letters
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2043498941