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Formation of CuO$_2$ sublattices by suppression of interlattice correlations in tetragonal CuO

by Max Bramberger, Benjamin Bacq-Labreuil, Martin Grundner, Silke Biermann, Ulrich Schollwöck, Sebastian Paeckel, Benjamin Lenz

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Submission summary

Authors (as registered SciPost users): Benjamin Bacq-Labreuil · Max Bramberger · Benjamin Lenz
Submission information
Preprint Link: scipost_202205_00016v2  (pdf)
Date accepted: 2022-10-18
Date submitted: 2022-09-12 11:37
Submitted by: Bramberger, Max
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Condensed Matter Physics - Theory
  • Condensed Matter Physics - Computational
Approaches: Theoretical, Computational


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.

Published as SciPost Phys. 14, 010 (2023)

Reports on this Submission

Anonymous Report 2 on 2022-10-12 (Invited Report)


The authors have taken into account my previous suggestions carefully. In particular, the relation to previous works has now been made more clear and, thus, I can fully recommend the manuscript for pulication.

  • validity: top
  • significance: high
  • originality: good
  • clarity: top
  • formatting: excellent
  • grammar: excellent

Anonymous Report 1 on 2022-9-13 (Invited Report)


The authors have implemented all suggested changes and addressed all of my former questions satisfactorily. Therefore I now recommend publication as a regular article in SciPost.

  • validity: -
  • significance: -
  • originality: -
  • clarity: -
  • formatting: -
  • grammar: -

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Max Bramberger  on 2022-09-13  [id 2808]

In order to make the passages we changed with respect to the first submission more recognizable, we attach here a latexdiff file highlighting the changes to the manuscript (blue for new text, red for deleted text).
Due to file size limitations we only included pages where changes were made in the latexdiff file.