Hallmark of strong electronic correlations in LaNiO${}_3$: photoemission kink and broadening of fully occupied bands

Abstract

Recent angular-resolved photoemission experiments on LaNiO${}_3$ reported a renormalization of the Fermi velocity of $e_g$ quasiparticles, a kink in their dispersion at $-0.2$ eV and a large broadening and weakened dispersion of the occupied $t_{2g}$ states. We show here that all these features result from electronic correlations and are quantitatively reproduced by calculations combining density-functional theory and dynamical mean-field theory. The importance and general relevance of correlation effects in filled bands coupled by inter-orbital interactions to a partially-filled band are pointed out.

5 pages, 5 figures

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