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  Dirac fermions in antiferromagnetic FeSn kagome lattices with combined space inversion and time-reversal symmetry

Lin, Z., Wang, C., Wang, P., Yi, S., Li, L., Zhang, Q., et al. (2020). Dirac fermions in antiferromagnetic FeSn kagome lattices with combined space inversion and time-reversal symmetry. Physical Review B, 102(15): 155103, pp. 1-7. doi:10.1103/PhysRevB.102.155103.

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 Creators:
Lin, Zhiyong1, Author
Wang, Chongze1, Author
Wang, Pengdong1, Author
Yi, Seho1, Author
Li, Lin1, Author
Zhang, Qiang1, Author
Wang, Yifan1, Author
Wang, Zhongyi1, Author
Huang, Hao1, Author
Sun, Yan2, Author              
Huang, Yaobo1, Author
Shen, Dawei1, Author
Feng, Donglai1, Author
Sun, Zhe1, Author
Cho, Jun-Hyung1, Author
Zeng, Changgan1, Author
Zhang, Zhenyu1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: Symmetry principles play a critical role in formulating the fundamental laws of nature, with a large number of symmetry-protected topological states identified in recent studies of quantum materials. As compelling examples, massless Dirac fermions are jointly protected by the space inversion symmetry P and time-reversal symmetry T supplemented by additional crystalline symmetry, while evolving into Weyl fermions when either P or T is broken. Here, based on first-principles calculations, we reveal that massless Dirac fermions are present in a layered FeSn crystal containing antiferromagnetically coupled ferromagnetic Fe kagome layers, where each of the P and T symmetries is individually broken but the combined PT symmetry is preserved. These stable Dirac fermions, protected by the combined PT symmetry with additional nonsymmorphic S-2z symmetry, can be transformed to either massless/massive Weyl or massive Dirac fermions by breaking the PT or S-2z symmetry. Our angle-resolved photoemission spectroscopy experiments indeed observed the Dirac states in the bulk and two-dimensional Weyl-like states at the surface. The present paper substantially enriches our fundamental understanding of the intricate connections between symmetries and topologies of matter, especially with the spin degree of freedom playing a vital role.

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Language(s): eng - English
 Dates: 2020-10-022020-10-02
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 102 (15) Sequence Number: 155103 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008