| A novel, purely electronic mechanism is presented which yields kinks in the electronic dispersion. It applies to strongly correlated metals whose spectral function shows well-separated Hubbard subbands and central peak as, for example, in transition metal-oxides. The position of the kinks and the energy range of validity of Fermi-liquid (FL) theory is determined solely by the FL renormalization factor and the bare, uncorrelated band structure. ARPES experiments at binding energies outside the FL regime can thus provide new, previously unexpected information about strongly correlated electronic systems. |
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