On fermionic excitations in doped Mott systems and their observation by ARPES Original Research Article

The exact Dyson equation for a transition orbital with strong interactions, coupled with an arbitrary number of ligands, is evaluated with a phenomenological interpolation formula that combines microscopic input from the high and low energy sectors. Explicit expressions for momentum-resolved fermionic excitation spectra and photoemission spectra are derived for the case of one ligand. The two types of spectra differ by observable interference effects.