Electronic structure of A-type antiferomagnetic LaMnO_3 by GW   approximation
  The 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. 
Y. Nohara, A. Yamasaki, S. Kobayashi and T. Fujiwara