Valley-polarized quantum anomalous Hall effect in van der Waals heterostructures based on monolayer jacutingaite family materials

Abstract

We numerically study the general valley polarization and anomalous Hall effect in van der Waals (vdW) heterostructures based on monolayer jacutingaite family materials Pt₂AX₃ (A = Hg, Cd, Zn; X = S, Se, Te). We perform a systematic study on the atomic, electronic, and topological properties of vdW heterostructures composed of monolayer Pt₂AX₃ and two-dimensional ferromagnetic insulators. We show that four kinds of vdW heterostructures exhibit valley-polarized quantum anomalous Hall phase, i.e., Pt₂HgS₃/NiBr₂, Pt₂HgSe₃/CoBr₂, Pt₂HgSe₃/NiBr₂, and Pt₂ZnS₃/CoBr₂, with a maximum valley splitting of 134.2 meV in Pt₂HgSe₃/NiBr₂ and sizable global band gap of 58.8 meV in Pt₂HgS₃/NiBr₂. Our findings demonstrate an ideal platform to implement applications on topological valleytronics.

Graphical abstract

Keywords

quantum anomalous Hall effect / valley polarization / topological valleytronics / transition metal dichalcogenides / jacutingaite family materials / first-principles calculations / van der Waals heterostructure

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Electronic supplementary material

Supplementary materials are available in the online version of this article at https://doi.org/10.1007/s11467-022-1228-4 and https://journal.hep.com.cn/fop/EN/10.1007/s11467-022-1228-4 and are accessible for authorized users.

Acknowledgements

We are grateful to Prof. Yang Gao for helpful advice and discussions. This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 11974327 and 12004369), the Fundamental Research Funds for the Central Universities (Nos. WK3510000010 and WK2030020032), and Anhui Initiative in Quantum Information Technologies (Grant No.AHY170000). We also thank for the high-performance supercomputing services provided by AM-HPC and the Supercomputing Center of University of Science and Technology of China.

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