Recently, the quantum anomalous Hall effect (QAHE) has been theoretically proposed in compensated antiferromagnetic systems by using the magnetic topological insulator model [see arXiv:2404.13305 (2024)]. However, the related and systematic study based on a realistic material system is still limited. As the only experimentally realized antiferromagnetic topological insulator, MnBi2Te4 becomes a vital platform for exploring various topological states. In this work, by using the comprehensive first-principles calculations, we demonstrate that the QAHE can also be realized in compensated antiferromagnetic even-septuple-layer MnBi2Te4 without combined parity-time (PT) symmetry. Using a magnetic topological insulator model, the layer-resolved Chern number is calculated to further understand the physical origin of different Chern numbers. The application of external hydrostatic pressure can strengthen the Te-Te quasicovalent bond due to the dramatic compression of the van der Waals gap. Thus, the resulting topological nontrivial gap can exceed the room-temperature energy scale in a wide range of pressures. Additionally, we find that constructing MnBi2Te4/CrI3 heterostructure can realize the compensated antiferromagnetic configurations with QAHE. Our findings illustrate the realization of QAHE in compensated antiferromagnetic even-septuple-layer MnBi2Te4 and provide a reliable strategy to obtain the corresponding magnetic configurations.
@article{arxiv.2412.20136,
title = {An ab-initio study on engineering quantum anomalous Hall effect in compensated antiferromagnet MnBi$_{2}$Te$_{4}$},
author = {Zeyu Li and Yulei Han and Zhenhua Qiao},
journal= {arXiv preprint arXiv:2412.20136},
year = {2025}
}