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  Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa

Yao, M., Manna, K., Yang, Q., Fedorov, A., Voroshnin, V., Schwarze, B. V., et al. (2020). Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa. Nature Communications, 11: 2033, pp. 1-7. doi:10.1038/s41467-020-15865-x.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-6353-D Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C277-9
Genre: Journal Article

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 Creators:
Yao, Mengyu1, Author              
Manna, Kaustuv1, Author              
Yang, Qun1, Author              
Fedorov, Alexander2, Author
Voroshnin, Vladimir2, Author
Schwarze, B. Valentin2, Author
Hornung, Jacob2, Author
Chattopadhyay, S.2, Author
Sun, Zhe2, Author
Guin, Satya N.1, Author              
Wosnitza, Jochen2, Author
Borrmann, Horst3, Author              
Shekhar, Chandra4, Author              
Kumar, Nitesh1, Author              
Fink, Jörg1, Author              
Sun, Yan1, Author              
Felser, Claudia5, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
4Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: experimental study, measurement method, observational method, spectroscopy, theoretical study, topology, ab initio calculation, angle resolved photoemission spectroscopy, article, chirality, controlled study, crystal, oscillometry
 Abstract: Non-symmorphic chiral topological crystals host exotic multifold fermions, and their associated Fermi arcs helically wrap around and expand throughout the Brillouin zone between the high-symmetry center and surface-corner momenta. However, Fermi-arc splitting and realization of the theoretically proposed maximal Chern number rely heavily on the spin-orbit coupling (SOC) strength. In the present work, we investigate the topological states of a new chiral crystal, PtGa, which has the strongest SOC among all chiral crystals reported to date. With a comprehensive investigation using high-resolution angle-resolved photoemission spectroscopy, quantum-oscillation measurements, and state-of-the-art ab initio calculations, we report a giant SOC-induced splitting of both Fermi arcs and bulk states. Consequently, this study experimentally confirms the realization of a maximal Chern number equal to ±4 in multifold fermionic systems, thereby providing a platform to observe large-quantized photogalvanic currents in optical experiments. © 2020, The Author(s).

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Language(s): eng - English
 Dates: 2020-04-272020-04-27
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: DOI: 10.1038/s41467-020-15865-x
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 11 Sequence Number: 2033 Start / End Page: 1 - 7 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723