Self-energy effects in the electronic structure of ce systems: Application to CeSi₂ and CeAl₂

We calculate the electronic structure of CeSi2 and CeAl2 using an energy-dependent potential arising from an approximation to the self-energy corresponding to a multiband Hubbard Hamiltonian. This potential is added to the local-density Hamiltonian and we determine the renormalized density of states. This density of states displays different peaks centred about -2.5eV, ±0.3eV, and 4eV with respect to E F, corresponding to the characteristic f features. We analyse these results and compare them with the previous data and theoretical interpretations of the electronic structure of these interesting materials. © 1994 IOP Publishing Ltd.