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  Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

Belopolski, I., Cochran, T. A., Liu, X., Cheng, Z.-J., Yang, X. P., Guguchia, Z., et al. (2021). Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet. Physical Review Letters, 127: 256403, pp. 1-7. doi:10.1103/PhysRevLett.127.256403.

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Genre: Journal Article
Alternative Title : Physical Review Letters

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Belopolski, Ilya1, Author
Cochran, Tyler A.1, Author
Liu, Xiaoxiong1, Author
Cheng, Zi-Jia1, Author
Yang, Xian P.1, Author
Guguchia, Zurab1, Author
Tsirkin, Stepan S.1, Author
Yin, Jia-Xin1, Author
Vir, Praveen2, Author              
Thakur, Gohil S.2, Author              
Zhang, Songtian S.1, Author
Zhang, Junyi1, Author
Kaznatcheev, Kaznatcheev1, Author
Cheng, Guangming1, Author
Chang, Guoqing1, Author
Multer, Daniel1, Author
Shumiya, Nana1, Author
Litskevich, Maksim1, Author
Vescovo, Elio1, Author
Kim, Timur K.1, Author
Cacho, Cephise1, AuthorYao, Nan1, AuthorFelser, Claudia3, Author              Neupert, Titus1, AuthorHasan, M. Zahid1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: Photoelectron spectroscopy, Quantum theory, Topology, Fermi arcs, Fundamental physics, High-resolution photoemission spectroscopy, Magnetic manipulation, Magnetic orders, Paramagnetic phasis, Quantum matter, Quantum technologies, Spin orbits, Topological state, Paramagnetism
 Abstract: The manipulation of topological states in quantum matter is an essential pursuit of fundamental physics and next-generation quantum technology. Here we report the magnetic manipulation of Weyl fermions in the kagome spin-orbit semimetal Co3Sn2S2, observed by high-resolution photoemission spectroscopy. We demonstrate the exchange collapse of spin-orbit-gapped ferromagnetic Weyl loops into paramagnetic Dirac loops under suppression of the magnetic order. We further observe that topological Fermi arcs disappear in the paramagnetic phase, suggesting the annihilation of exchange-split Weyl points. Our findings indicate that magnetic exchange collapse naturally drives Weyl fermion annihilation, opening new opportunities for engineering topology under correlated order parameters. © 2021 American Physical Society.

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Language(s): eng - English
 Dates: 2021-12-172021-12-17
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevLett.127.256403
 Degree: -

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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 127 Sequence Number: 256403 Start / End Page: 1 - 7 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1