Kavli Affiliate: Jing Wang
| First 5 Authors: Yadong Jiang, Huan Wang, Jing Wang, ,
| Summary:
We theoretically propose that the van der Waals layered ternary transition
metal chalcogenide FeTaX$_2$ (X = S, Se, Te) is a new family of ferrimagnetic
quantum anomalous Hall insulators with sizable bulk gap and Chern number C =
-2. The magnetic ordering originates predominantly from the Fe atoms, where
strong ferromagnetic exchange interactions between them induce magnetic moments
on the Ta sites, yielding a collinear ferrimagnetic ground state. The large
topological gap arises from the deep sd-type band inversion between spin-down
Ta d$_{z^2}$ and d$_{xy}$ orbitals near the Fermi level-a mechanism unique to
d-orbital systems. Remarkably, the Curie temperature of monolayer FeTaX$_2$ is
predicted to significantly exceed that of monolayer MnBi$_2$Te$_4$.
Furthermore, both the Curie temperature and topological gap scale positively
with the spin orbit coupling strength of the $d$ electrons, suggesting a common
physical origin. These findings, if realized experimentally, could open new
avenues for the research and application of topological quantum physics.
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