Twisted-bilayer FeSe and the Fe-based superlattices

Eugenio, Paul Myles; Vafek, Oskar

doi:10.21468/SciPostPhys.15.3.081

Twisted-bilayer FeSe and the Fe-based superlattices

Aug 23, 2022

35 pages

Published in:

SciPost Phys. 15 (2023) 3, 081,
SciPost Phys. 15 (2023) 081

Published: Sep 6, 2023

e-Print:

2208.11142 [cond-mat.str-el]

DOI:

10.21468/SciPostPhys.15.3.081

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Abstract: (SciPost Fundation)

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.

Note:

35 pages; 18 figs; Changed name from "Minimal continuum models in Fe-based superlattices"

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