|
In many metallic compounds, Coulomb repulsion among transition orbitals competes with hybridisation into ligand bands. Our phenomenological Ansatz for the multiorbital Green functions [1] allows to make close contact with specified microscopic lattice models. In general, the input is obtained from exact diagonalisation of a small cluster, combined with a bandstructure calculation of the Fermi surface. The periodic Anderson model in the charge transfer regime is a generic case that allows to go a long way analytically. The obtained results illustrate the possibilities of the general framework, in the context of interpreting experimental ARPES data. [1] K. Matho, J. of Electr. Spectr. and Related Phenom. 117 (2001) 13-30 |