Kavli Affiliate: Jing Wang
| First 5 Authors: Yadong Jiang, Huan Wang, Kejie Bao, Jing Wang,
| Summary:
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 V$_2$WS$_4$ and
its related materials show intralayer ferromagnetic and interlayer
antiferromagnetic exchange interactions. We find extremely rich magnetic
topological states in V$_2$WS$_4$, 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 V$_2$WS$_4$ is predicted to
be much higher than that of MnBi$_2$Te$_4$. These interesting predictions, if
realized experimentally, could greatly promote the topological quantum physics
research and application.
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