FeTaX2: A ferrimagnetic quantum anomalous Hall insulator
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arXiv
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| Format: | Preprint |
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2025
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| author | Jiang, Yadong Wang, Huan Wang, Jing |
| author_facet | Jiang, Yadong Wang, Huan Wang, Jing |
| contents | We propose that the van der Waals layered ternary transition metal chalcogenides FeTa$X_2$ ($X=$ S, Se, Te) as a new family of ferrimagnetic quantum anomalous Hall insulators with a sizable bulk gap and high Chern number $C=-2$. The magnetic order arises primarily from Fe atoms, whose strong ferromagnetic exchange induces moments on neighboring Ta sites. The large topological gap originates from a \emph{deep} $s$-$d$-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 FeTa$X_2$ 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. Owing to its structural similarity to Fe$X$ superconductors and reduced net magnetization, FeTa$X_2$ further offers a promising platform for realizing chiral topological superconductivity. These findings, if realized experimentally, could open new avenues for the research and application of topological quantum physics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_07125 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | FeTaX2: A ferrimagnetic quantum anomalous Hall insulator Jiang, Yadong Wang, Huan Wang, Jing Mesoscale and Nanoscale Physics Materials Science We propose that the van der Waals layered ternary transition metal chalcogenides FeTa$X_2$ ($X=$ S, Se, Te) as a new family of ferrimagnetic quantum anomalous Hall insulators with a sizable bulk gap and high Chern number $C=-2$. The magnetic order arises primarily from Fe atoms, whose strong ferromagnetic exchange induces moments on neighboring Ta sites. The large topological gap originates from a \emph{deep} $s$-$d$-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 FeTa$X_2$ 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. Owing to its structural similarity to Fe$X$ superconductors and reduced net magnetization, FeTa$X_2$ further offers a promising platform for realizing chiral topological superconductivity. These findings, if realized experimentally, could open new avenues for the research and application of topological quantum physics. |
| title | FeTaX2: A ferrimagnetic quantum anomalous Hall insulator |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2506.07125 |