Intrinsic magnetic topological insulators offers an ideal platform to explore exotic topological phenomena, such as axion electrodynamics, quantum anomalous Hall (QAH) effect and Majorana edge modes. However, these emerging new physical effects have rarely been experimentally observed due to the limited choice of suitable materials. Here, we predict the van der Waals layered V2WS4 and its related materials show intralayer ferromagnetic and interlayer antiferromagnetic exchange interactions. We find extremely rich magnetic topological states in V2WS4, including an antiferromagnetic topological insulator, the axion state with the long-sought quantized topological magnetoelectric effect, three-dimensional QAH state, as well as a collection of QAH insulators and intrinsic axion insulators in odd- and even-layer films, respectively. Remarkably, the N\'eel temperature of V2WS4 is predicted to be much higher than that of MnBi2Te4. These interesting predictions, if realized experimentally, could greatly promote the topological quantum physics research and application.
@article{arxiv.2308.15023,
title = {Intrinsic antiferromagnetic topological insulator and axion state in V2WS4},
author = {Yadong Jiang and Huan Wang and Kejie Bao and Jing Wang},
journal= {arXiv preprint arXiv:2308.15023},
year = {2025}
}