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A ferromagnetic hybrid Weyl semimetal in two dimensions: the monolayer AgCrS2

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Abstract

Topological quantum phases in two-dimensional materials have been a fascinating research topic since the discovery of graphene. Particularly, the topological quantum phases could appear in two-dimensional magnetic systems. However, identifying concrete materials that host topological quantum phases is still a challenge, especially the magnetic ones. In this work, we propose a novel hybrid Weyl semimetal in two dimensions, the monolayer AgCrS2. We show that this material has a stable ferromagnetic ground state with an in-plane magnetic moment. Particularly, it hosts a hybrid of two Weyl nodes close to the Fermi level: one is a double Weyl point, and the other one is type-II linear Weyl point. The features of their band structure could be inferred from the effective models for them. When the spin-orbital coupling is included, the double Weyl point is gapped. In comparison, the type-II linear Weyl nodes on high-symmetry path can be tuned by controlling the orientation of the magnetization direction. To be specific, the magnetization could change locations of type-II linear Weyl nodes and control its stability. Therefore, our results offer a platform to study novel hybrid of Weyl nodes in two-dimensional ferromagnetic system.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grants No. 11904074). The work is funded by the Science and Technology Project of the Hebei Education Department, the Nature Science Foundation of Hebei Province, the S&T Program of Hebei (No. A2021202012), the Overseas Scientists Sponsorship Program by Hebei Province (C20210330), and the fund from the State Key Laboratory of Reliability and Intelligence of Electrical Equipment of Hebei University of Technology (No. EERI_PI2020009). One of the authors (X.M.Z.) acknowledges financial support from the Young Elite Scientists Sponsorship Program by Tianjin.

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Li, M., Liu, Y., Dai, X. et al. A ferromagnetic hybrid Weyl semimetal in two dimensions: the monolayer AgCrS2. J Mater Sci 58, 281–290 (2023). https://doi.org/10.1007/s10853-022-08043-5

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