Local correlations necessitate waterfalls as a connection between quasiparticle band and developing Hubbard bands

Abstract

Waterfalls are anomalies in the angle-resolved photoemission spectrum where the energy-momentum dispersion is almost vertical, and the spectrum strongly smeared out. These anomalies are observed at relatively high energies, among others, in superconducting cuprates and nickelates. The prevalent understanding is that they originate from the coupling to some boson, with spin fluctuations and phonons being the usual suspects. Here, we show that waterfalls occur naturally in the process where a Hubbard band develops and splits off from the quasiparticle band. Our results for the Hubbard model with $\text{ab initio}$ determined parameters well agree with waterfalls in cuprates and nickelates, providing a natural explanation for these spectral anomalies observed in correlated materials.

7 pages, 4 figures, 1 mp4 file, Supplementary Information contains comparisons of DMFT and D$\Gamma$A

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Cited by in corpus (4)

• Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures
• Dichotomy in Low- and High-energy Band Renormalizations in Trilayer Nickelate $L{a}_{4}N{i}_3{O}_{10}$: a Comparison with Cuprates
• Non-Perturbative Feats in the Physics of Correlated Antiferromagnets
• Origin of misleading convergence in self-consistent many-electron theories: Fundamental aspects and practical implications