TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.15.3.081
TI  - Twisted-bilayer FeSe and the Fe-based superlattices
PY  - 2023/09/06
UR  - https://www.scipost.org/SciPostPhys.15.3.081
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 15
IS  - 3
SP  - 081
A1  - Eugenio, Paul Myles
AU  - Vafek, Oskar
AB  - We derive BM-like continuum models for the bands of superlattice heterostructures formed out of Fe-chalcogenide monolayers: (I) a single monolayer experiencing an external periodic potential, and (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 ±1 topological quantum numbers without breaking time-reversal symmetry. In the $C=0$ region for $\theta→0$ (and similarly in the limit of large superlattice period for 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.
ER  -

@Article{10.21468/SciPostPhys.15.3.081,
	title={{Twisted-bilayer FeSe and the Fe-based superlattices}},
	author={Paul M. Eugenio and Oskar Vafek},
	journal={SciPost Phys.},
	volume={15},
	pages={081},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.15.3.081},
	url={https://scipost.org/10.21468/SciPostPhys.15.3.081},
}