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Twisted-bilayer FeSe and the Fe-based superlattices

by P. Myles Eugenio, Oskar Vafek

This Submission thread is now published as

Submission summary

Authors (as registered SciPost users): Paul Eugenio
Submission information
Preprint Link:  (pdf)
Date accepted: 2023-06-21
Date submitted: 2023-05-23 18:56
Submitted by: Eugenio, Paul
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Condensed Matter Physics - Theory
  • Quantum Physics
Approach: Theoretical


We derive BM-like continuum models for the bands of superlattice heterostructures formed out of Fe-chalcogenide monolayers: (${\bf\text I}$) a single monolayer experiencing an external periodic potential, and (${\bf\text II}$) twisted bilayers with long-range moire tunneling. A symmetry derivation for the inter-layer moire tunnelling is provided for both the $\Gamma$ and $M$ high-symmetry points. In this paper, we focus on moire bands formed from hole-band maxima centered on $\Gamma$, and show the possibility of moire bands with $C=0$ or $\pm 1$ topological quantum numbers without breaking time-reversal symmetry. In the $C=0$ region for $\theta\rightarrow 0$ (and similarly in the limit of large superlattice period for ${\bf\text I}$), the system becomes a square lattice of 2D harmonic oscillators. We fit our model to FeSe and argue that it is a viable platform for the simulation of the square Hubbard model with tunable interaction strength.

Author comments upon resubmission

We thank both the referees for their time and feedback, and the editor for handling our manuscript. We have updated the formatting and added a conclusion per the referee requests. We agree that the original formatting was unusually, being a consequence of the dual nature of this paper -- one part technical manual, plus an explicit experimental proposal for a given device. Since the latter was arguably more relevant to a larger scientific audience, we focused on it in the lengthy intro, making it as complete as possible.

We do not want to have the reader interested in the proposal bogged down in technical details related to group theory, so to this end, we have kept the lengthy intro in tact; however, we have reorganized the paper into two clear sections, and added a conclusion. We use the conclusion to discuss the relationship to previous works; highlight future work that this manuscript is a foundation for; as well as discuss the limitations of our continuum theory, and what it might mean for future works.

List of changes

Reorganized sections; added conclusion; moved chiral limit details to appendix (post acknowledgements); and added additional citations relevant to the final discussion.

Published as SciPost Phys. 15, 081 (2023)

Reports on this Submission

Anonymous Report 2 on 2023-6-6 (Invited Report)


In that new version of the manuscript, the authors have modified the outline of the article to make it more accessible to the reader. I would have preferred a more concise introduction, but I can understand the authors' arguments. Moreover, they have added a much more detailed conclusion that sets well the article's conclusions in context. As I write in my previous report, this work deserves to be published and I consider the present manuscript ready for publication in SciPost Physics.

  • validity: high
  • significance: top
  • originality: high
  • clarity: ok
  • formatting: good
  • grammar: -

Anonymous Report 1 on 2023-6-6 (Invited Report)


In their resubmitted version the authors fully addressed the issues that I brought up, namely the relation to the prior works and a summary discussion. While I still find the summary somewhat demanding to follow, so is the subject. Therefore I recommend the publication of the manuscript as is.

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

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