SciPost Submission Page
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: | https://arxiv.org/abs/2208.11142v3 (pdf) |
| Date accepted: | June 21, 2023 |
| Date submitted: | May 23, 2023, 6:56 p.m. |
| Submitted by: | Eugenio, Paul |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
|
| Approach: | Theoretical |
Abstract
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 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)