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Multiple magnetism controlled topological states in EuAgAs

Authors :
Jin, Yahui
Zeng, Xu-Tao
Feng, Xiaolong
Du, Xin
Wu, Weikang
Sheng, Xian-Lei
Yu, Zhi-Ming
Zhu, Ziming
Yang, Shengyuan A.
Source :
Phys. Rev. B 104, 165424 (2021)
Publication Year :
2021

Abstract

The interplay between magnetism and band topology is a focus of current research on magnetic topological systems. Based on first-principle calculations and symmetry analysis, we reveal multiple intriguing topological states can be realized in a single system EuAgAs, controlled by the magnetic ordering. The material is Dirac semimetal in the paramagnetic state, with a pair of accidental Dirac points. Under different magnetic configurations, the Dirac points can evolve into magnetic triply-degenerate points, magnetic linear and double Weyl points, or being gapped out and making the system a topological mirror semimetal characterized by mirror Chern numbers. The change in bulk topology is also manifested in the surface states, including the surface Fermi arcs and surface Dirac cones. In addition, the antiferromagnetic states also feature a nontrivial Z4 index, implying a higher order topology. These results deepen our understanding of magnetic topological states and provide new perspectives for spintronic applications.<br />Comment: 8 pages,7 figures

Details

Database :
arXiv
Journal :
Phys. Rev. B 104, 165424 (2021)
Publication Type :
Report
Accession number :
edsarx.2107.13345
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevB.104.165424