Monolayer V2MX4: A new family of quantum anomalous Hall insulators

We theoretically propose that the van der Waals layered ternary transition metal chalcogenide V\(_2 MX_4\) (\(M=\) W, Mo; \(X=\) S, Se) is a new family of quantum anomalous Hall insulators with sizable bulk gap and Chern number \(\mathcal{C}=-1\). The large topological gap originates from the \emph{...

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Bibliographic Details
Published in:arXiv.org 2024-02
Main Authors: Jiang, Yadong, Wang, Huan, Bao, Kejie, Liu, Zhaochen, Wang, Jing
Format: Article
Language:English
Subjects:
Insulators
Monolayers
Multilayers
Orbitals
Spin-orbit interactions
Symmetry
Titanium
Topology
Transition metal compounds
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Summary:We theoretically propose that the van der Waals layered ternary transition metal chalcogenide V\(_2 MX_4\) (\(M=\) W, Mo; \(X=\) S, Se) is a new family of quantum anomalous Hall insulators with sizable bulk gap and Chern number \(\mathcal{C}=-1\). The large topological gap originates from the \emph{deep} band inversion between spin up bands contributed by \(d_{xz},d_{yz}\) orbitals of V and spin down band from \(d_{z^2}\) orbital of \(M\) at Fermi level. Remarkably, the Curie temperature of monolayer V\(_2 MX_4\) is predicted to be much higher than that of monolayer MnBi\(_2\)Te\(_4\). Furthermore, the thickness dependence of the Chern number for few multilayers shows interesting oscillating behavior. The general physics from the \(d\)-orbitals here applies to a large class of ternary transition metal chalcogenide such as Ti\(_2\)W\(X_4\) with the space group \(P\)-\(42m\). These interesting predictions, if realized experimentally, could greatly promote the research and application of topological quantum physics.
ISSN:2331-8422
DOI:10.48550/arxiv.2303.14685