# SKM 2023 – wissenschaftliches Programm

## Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# TT: Fachverband Tiefe Temperaturen

## TT 43: Poster: Correlated Electrons II

### TT 43.11: Poster

### Mittwoch, 29. März 2023, 15:00–18:00, P2/OG3

Tetragonal CuO : Suppression of nearest-neighbour correlations in a strongly correlated material — •Benjamin Bacq-Labreuil^{1}, Max Bramberger^{2}, Martin Grundner^{2}, Silke Biermann^{3}, Ulrich Schollwöck^{2}, Sebastian Paeckel^{2}, and Benjamin Lenz^{4} — ^{1}Institut Quantique, Université de Sherbrooke, Sherbrooke, Canada — ^{2}Arnold Sommerfeld Center of Theoretical Physics, University of Munich, Munich, Germany — ^{3}CPHT, Ecole Polytechnique, Palaiseau, France — ^{4}IMPMC, Sorbonne Université, Paris, France

Since tetragonal CuO (t-CuO) is composed of well separated 2D CuO planes, it appears as an ideal candidate to connect model calculations with real materials in the quest of understanding the nature of high-temperature superconductivity. In this work [1], we investigate the low-energy electronic properties of t-CuO by means of Cellular Dynamical Mean Field Theory (CDMFT) using a 2D Hubbard model. From experiment it was proposed that single layers of t-CuO can be viewed as two weakly interconnected sublattices. Our calculations support this assumption: we find a suppression of the nearest-neighbour (NN) correlations for the benefit of the next-nearest neighbour (NNN) ones. The calculated spectral function is in remarkable agreement with photoemission experiments, showing that a one-band model is sufficient to capture the low-energy physics of t-CuO. Finally, we study the transition from the paramagnetic to antiferromagnetic phase at finite temperature and elucidate the nature of the insulating regime in both phases.

[1] M. Bramberger et al., arXiv:2203.07880 (2022)