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TT: Fachverband Tiefe Temperaturen

TT 7: Correlated Electrons: Electronic Structure Calculations

TT 7.10: Talk

Monday, March 18, 2024, 12:00–12:15, H 3025

On the cuprates’ universal waterfall feature: evidence of a momentum-driven cross-over — Benjamin Bacq-Labreuil¹, Chafic Fawaz², Matteo d’Astuto², Silke Biermann^1,3, and •Benjamin Lenz⁴ — ¹Ecole Polytechnique, Palaiseau, France — ²Institut Néel, Grenoble, France — ³Collège de France, Paris, France — ⁴Sorbonne Université, Paris, France

We study two related universal anomalies of the spectral function of cuprates, so called waterfall and high-energy kink features, by a combined cellular dynamical mean-field theory and angle-resolved photoemission study for the oxychloride Na_xCa_2−xCuO₂Cl₂ (Na-CCOC). Tracing their origin back to an interplay of spin-polaron and local correlation effects both in undoped and hole-doped (Na-)CCOC, we establish them as a universal cross-over between regions differing in the momentum-dependence of the coupling and not necessarily in the energy of the related quasiparticles. The proposed scenario extends to doping levels coinciding with the cuprate’s superconducting dome and motivates further investigations of the fate of spin-polarons in the superconducting phase.

Keywords: cuprates; cellular dynamical mean-field theory; angle-resolved photoemission spectroscopy; spin-polaron; spectral function