Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 7: Correlated Electrons: Electronic Structure Calculations
TT 7.3: Talk
Monday, March 17, 2025, 15:30–15:45, H31
Single- and two-particle observables in the Emery model: A dynamical mean-field perspective — •Yi-Ting Tseng1, Mario Malcolms2, Henri Menke1,2, Marcel Klett2, Thomas Schäfer2, and Philipp Hansmann1 — 1Friedrich-Alexander-University Erlangen-Nürnberg — 2Max Planck Institute for Solid State Research, Stuttgart
We investigate dynamical mean-field calculations of the three-band Emery model at the one- and two-particle level for material-realistic parameters of high-Tc superconductors[1]. Our study shows that even within dynamical mean-field theory, which accounts solely for temporal fluctuations, the intrinsic multi-orbital nature of the Emery model introduces effective non-local correlations. These correlations lead to a non-Curie-like temperature dependence of the magnetic susceptibility, consistent with nuclear magnetic resonance experiments in the pseudogap regime. By analyzing the temperature dependence of the static dynamical mean-field theory spin susceptibility, we find indications of emerging oxygen-copper singlet fluctuations, explicitly captured by the model. Despite correctly describing the hallmark of the pseudogap at the two-particle level, such as the drop in the Knight shift of nuclear magnetic resonance, dynamical mean-field theory fails to capture the spectral properties of the pseudogap.
[1] YiTing Tseng et al., arXiv:2311.09023.
Keywords: cuprates; dynamical mean-field theory; Emery model