Single-particle spectra and magnetic susceptibility in the Emery model: A dynamical mean-field perspective

Tseng YT, Malcolms MO, Menke H, Klett M, Schäfer T, Hansmann P (2025)

Publication Type: Journal article

Publication year: 2025

Journal

SciPost Physics SciPost

Book Volume: 18

Article Number: 145

Journal Issue: 5

DOI: 10.21468/SciPostPhys.18.5.145

Abstract

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. 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.

Authors with CRIS profile

Yi-Ting Tseng Professur für Theoretische Physik mit dem Schwerpunkt Molekulare Materialien Henri Menke Professur für Theoretische Physik mit dem Schwerpunkt Molekulare Materialien Philipp Hansmann Professur für Theoretische Physik mit dem Schwerpunkt Molekulare Materialien

Involved external institutions

Max-Planck-Institut für Festkörperforschung

Germany (DE)

How to cite

APA:

Tseng, Y.-T., Malcolms, M.O., Menke, H., Klett, M., Schäfer, T., & Hansmann, P. (2025). Single-particle spectra and magnetic susceptibility in the Emery model: A dynamical mean-field perspective. SciPost Physics, 18(5). https://doi.org/10.21468/SciPostPhys.18.5.145

MLA:

Tseng, Yi-Ting, et al. "Single-particle spectra and magnetic susceptibility in the Emery model: A dynamical mean-field perspective." SciPost Physics 18.5 (2025).

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