Monolayer V2MX4: A new family of quantum anomalous Hall insulators

Abstract

We theoretically propose that the van der Waals layered ternary transition metal chalcogenide V${}_{2}M{X}_4$ ($M=$ 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${}_{2}M{X}_4$ 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.

7 pages, 4 figures

References in corpus (12)

• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Quantum Anomalous Hall Effect in Hg${}_{1-y}$Mn${}_y$Te Quantum Wells
• Quantum anomalous Hall effect from intertwined moiré bands
• Bulk Topological Invariants in Noninteracting Point Group Symmetric Insulators
• Colloquium: Quantum anomalous Hall effect
• Progress and prospects in magnetic topological materials
• Precise quantization of anomalous Hall effect near zero magnetic field
• Double crystallographic groups and their representations on the Bilbao Crystallographic Server
• Chern Number Tunable Quantum Anomalous Hall Effect in Monolayer Transitional Metal Oxides via Manipulating Magnetization Orientation
• Graph Theory Data for Topological Quantum Chemistry
• Large-Gap Quantum Anomalous Hall Insulators in $A$Ti$X$ Class

Cited by in corpus (4)

• Two-dimensional non-van der Waals niobium nitride nanosheets with high-temperature two-gap superconductivity
• Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
• Intrinsic antiferromagnetic topological insulator and axion state in V2WS4
• An ab-initio study on engineering quantum anomalous Hall effect in compensated antiferromagnet MnBi${}_2$Te${}_4$