SKM 2023 – wissenschaftliches Programm

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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-Labreuil1, Max Bramberger2, Martin Grundner2, Silke Biermann3, Ulrich Schollwöck2, Sebastian Paeckel2, and Benjamin Lenz41Institut Quantique, Université de Sherbrooke, Sherbrooke, Canada — 2Arnold Sommerfeld Center of Theoretical Physics, University of Munich, Munich, Germany — 3CPHT, Ecole Polytechnique, Palaiseau, France — 4IMPMC, 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)

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