TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.14.1.010
TI  - Formation of CuO$_2$ sublattices by suppression of interlattice correlations in tetragonal CuO
PY  - 2023/01/31
UR  - https://www.scipost.org/SciPostPhys.14.1.010
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 14
IS  - 1
SP  - 010
A1  - Bramberger, Max
AU  - Bacq-Labreuil, Benjamin
AU  - Grundner, Martin
AU  - Biermann, Silke
AU  - schollwoeck, Ulrich
AU  - Paeckel, Sebastian
AU  - Lenz, Benjamin
AB  - We investigate the tetragonal phase of the binary transition metal oxide CuO (t-CuO) within the context of cellular dynamical mean-field theory. Due to its strong antiferromagnetic correlations and simple structure, analysing the physics of t-CuO is of high interest as it may pave the way towards a more complete understanding of high-temperature superconductivity in hole-doped antiferromagnets. In this work we give a formal justification for the weak-coupling assumption that has previously been made for the interconnected sublattices within a single layer of t-CuO by studying the non-local self-energies of the system. We compute momentum-resolved spectral functions using a Matrix Product State (MPS)-based impurity solver directly on the real axis, which does not require any numerically ill-conditioned analytic continuation. The agreement with photoemission spectroscopy indicates that a single-band Hubbard model is sufficient to capture the material's low energy physics. We perform calculations on a range of different temperatures, finding two magnetic regimes, for which we identify the driving mechanism behind their respective insulating state. Finally, we show that in the hole-doped regime the sublattice structure of t-CuO has interesting consequences on the symmetry of the superconducting state.
ER  -

@Article{10.21468/SciPostPhys.14.1.010,
	title={{Formation of CuO$_2$ sublattices by suppression of interlattice correlations in tetragonal CuO}},
	author={Max Bramberger and Benjamin Bacq-Labreuil and Martin Grundner and Silke Biermann and Ulrich Schollwöck and Sebastian Paeckel and Benjamin Lenz},
	journal={SciPost Phys.},
	volume={14},
	pages={010},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.14.1.010},
	url={https://scipost.org/10.21468/SciPostPhys.14.1.010},
}