"Quasiparticle band structures and optical spectra of beta-cristobalite SiO₂ ",
L.E. Ramos, J. Furthmüller, and F. Bechstedt,
Phys. Rev. B 69, 085102 (2004).

Band structures and dielectric functions are calculated using density functional theory (DFT) and local density approximation (LDA) for three beta-cristobalite modifications of SiO₂ with space-group symmetries Fd3m, I-42d, and P2₁3. Quasiparticle corrections for the Kohn-Sham eigenvalues are determined in a GW approach. The fundamental energy gaps, absorption onsets, and dielectric functions are discussed and compared in the light of experimental data and previous calculations.