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  Spin-polarized gap in the magnetic Weyl semimetal Co3Sn2S2

Sun fei, F., Zhang, T., Yi, C. J., Wu, Y. L., Zhao, H., Wu, Q., et al. (2021). Spin-polarized gap in the magnetic Weyl semimetal Co3Sn2S2. Physical Review B, 104(10): L100301, pp. 1-8. doi:10.1103/PhysRevB.104.L100301.

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 Creators:
Sun fei, Fei1, Author
Zhang, Tan1, Author
Yi, C. J.1, Author
Wu, Y. L.1, Author
Zhao, H.1, Author
Wu, Q.1, Author
Shi, Y. G.1, Author
Weng, Hongming1, Author
Zhao, Jimin1, Author
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1External Organizations, ou_persistent22              

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 Abstract: We report a unique type of gap in a magnetic Weyl semimetal Co3Sn2S2 where the electrons are spin polarized and preserve the spin-momentum locking feature of Weyl fermions. Such spin-polarized gaps are associated with the Weyl node annihilation, where a pair of Weyl nodes with opposite chirality touch each other at similar to 210 meV above the Fermi energy. These are revealed by both time- and spin-resolved ultrafast spectroscopy experiments, combined with first-principles calculations. The spin-polarized gap opening is accompanied by a topological phase transition, and the gap magnitude exhibits an unconventional temperature dependence originated from the Weyl physics. Furthermore, we propose possible circularly polarized terahertz-midinfrared radiation from such a spin-polarized gap. Our results shed light on exploring the topological properties of excited states and endow application potentials for gapped materials based on chirality.

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Language(s): eng - English
 Dates: 2021-09-072021-09-07
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
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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: 104 (10) Sequence Number: L100301 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008