Diagnostics for plasmon satellites and Hubbard bands in transition metal oxides

The high energy spectral features of strongly correlated materials so far have not received as much as attention as the low energy features. Well established is the picture of a correlated metal, which exhibits a renormalized quasi-particle peak at the Fermi level, with a transfer of spectral weight into upper and lower Hubbard bands that are separated by the low energy static value of the Coulomb interaction U. Recently, this picture has become blurred with the rise in interest in systems which show additional plasmonic satellites at higher energies as well as close to the Fermi level. This renders the identification of spectral features of correlated electron materials non-trivial, since plasmonic satellites are not captured by static mean-field or static Hubbard-type interaction pictures. We will show how to distinguish these two types of satellites in the spectral function within modern ab-initio calculations based on the GW approximation combined with dynamica mean-field theory (GW+DMFT). Using this scheme we analyze the transition metal oxides SrVO₃ and SrMoO3 which we find to exhibit both Hubbard and plasmonic satellites at very similar energetic positions.