Dichotomy in Low- and High-energy Band Renormalizations in Trilayer Nickelate : a Comparison with Cuprates
arXiv:2509.08974 · doi:10.1103/smkf-k7wq
Abstract
Band renormalizations comprise crucial insights for understanding the intricate roles of electron-boson coupling and electron correlation in emergent phenomena such as superconductivity. In this study, by combining high-resolution angle-resolved photoemission spectroscopy and theoretical calculations, we systematically investigate the electronic structure of the trilayer nickelate superconductor at ambient pressure. We reveal a dichotomy in the electronic band renormalizations of in comparison to cuprate superconductors. At a high energy scale of hundreds of meV, its band structure is strongly renormalized by electron correlation effect enhanced by Hund coupling. The resultant waterfall-like dispersions resemble the high-energy kinks in cuprate superconductors. However, at low energy scales of tens of meV, the dispersive bands are nearly featureless and devoid of any resolvable electron-boson interactions, in drastic contrast to the low-energy kinks observed in cuprates and other correlated 3d transition-metal compounds. The dichotomic band renormalizations highlight the disparity between nickelate and cuprate superconductors and emphasize the importance of strong electron-correlation in the superconductivity of Ruddlesden-Popper phase nickelates.
accepted by Physical Review Letters
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Cited by in corpus (5)
- Complex spin-density-wave ordering in LaNiO
- Universal electronic structure of multi-layered nickelates via oxygen-centered planar orbitals
- Multiorbital character of the density wave in trilayer nickelate superconductors
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