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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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Yao_Observation.pdf (Verlagsversion), 2MB
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2020
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Yao, Mengyu1, Autor           
Manna, Kaustuv1, Autor           
Yang, Qun1, Autor           
Fedorov, Alexander2, Autor
Voroshnin, Vladimir2, Autor
Schwarze, B. Valentin2, Autor
Hornung, Jacob2, Autor
Chattopadhyay, S.2, Autor
Sun, Zhe2, Autor
Guin, Satya N.1, Autor           
Wosnitza, Jochen2, Autor
Borrmann, Horst3, Autor           
Shekhar, Chandra4, Autor           
Kumar, Nitesh1, Autor           
Fink, Jörg1, Autor           
Sun, Yan1, Autor           
Felser, Claudia5, Autor           
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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Schlagwörter: experimental study, measurement method, observational method, spectroscopy, theoretical study, topology, ab initio calculation, angle resolved photoemission spectroscopy, article, chirality, controlled study, crystal, oscillometry
 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2020-04-272020-04-27
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1038/s41467-020-15865-x
 Art des Abschluß: -

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Titel: Nature Communications
  Kurztitel : Nat. Commun.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: London : Nature Publishing Group
Seiten: - Band / Heft: 11 Artikelnummer: 2033 Start- / Endseite: 1 - 7 Identifikator: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723