Dichotomy in Low- and High-Energy Band Renormalizations in Trilayer Nickelate La_{4}Ni_{3}O_{10}: A Comparison with
X Du1,2, Y L Wang3,4,5, Y D Li1
1Tsinghua University, State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Beijing 100084, China.
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 Letter, by combining high-resolution angle-resolved photoemission spectroscopy and theoretical calculations, we systematically investigate the electronic structure of the trilayer nickelate superconductor La_{4}Ni_{3}O_{10} at ambient pressure. We reveal a dichotomy in the electronic band renormalizations of La_{4}Ni_{3}O_{10} in comparison to cuprate superconductors. At a high energy scale of hundreds of meV, its band structure is strongly renormalized by an electron correlation effect enhanced by Hund's 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.
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