TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.18.5.145
TI  - Single-particle spectra and magnetic susceptibility in the Emery model: A dynamical mean-field perspective
PY  - 2025/05/01
UR  - https://scipost.org/SciPostPhys.18.5.145
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 18
IS  - 5
SP  - 145
A1  - Tseng, Yi-Ting
AU  - Malcolms, Mario
AU  - Menke, Henri
AU  - Klett, Marcel
AU  - Schäfer, Thomas
AU  - Hansmann, Philipp
AB  - 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-$T_c$ superconductors. 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 uniform static spin susceptibility obtained by single-site and cluster dynamical mean-field theory, 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.
ER  -

@Article{10.21468/SciPostPhys.18.5.145,
	title={{Single-particle spectra and magnetic susceptibility in the Emery model: A dynamical mean-field perspective}},
	author={Yi-Ting Tseng and Mário O. Malcolms and Henri Menke and Marcel Klett and Thomas Schäfer and Philipp Hansmann},
	journal={SciPost Phys.},
	volume={18},
	pages={145},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.18.5.145},
	url={https://scipost.org/10.21468/SciPostPhys.18.5.145},
}