2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26819The electronic structure of the A-type antiferromagnetic insulator LaMnO3 is investigated by the GW approximation. The band gap and spectrum are in a good agreement with experimental observation. The on-site/off-site dynamical screened Coulomb interaction on Mn sites is also calculated. Comparison with the results by the Hartree-Fock and the static COHSEX approximations is discussed in detail. The dynamical screening effect is important for the band gap and widths.4 pages, 5 figuresStrongly Correlated ElectronsMaterials Sciencetext