Twisted-bilayer FeSe and the Fe-based superlattices

• URL: http://arxiv.org/abs/2208.11142v3
• Date: Mon, 22 May 2023 14:09:31 GMT
• Title: Twisted-bilayer FeSe and the Fe-based superlattices
• Authors: P. Myles Eugenio and Oskar Vafek
• Abstract summary: We derive BM-like continuum models for the bands of superlattice heterostructures formed out of Fe-chalcogenide monolayers. A symmetry derivation for the inter-layer moire tunnelling is provided for both the $Gamma$ and $M$ high-symmetry points. 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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