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  Chiral topological semimetal with multifold band crossings and long Fermi arcs

Schröter, N. B. M., Pei, D., Vergniory, M. G., Sun, Y., Manna, K., de Juan, F., et al. (2019). Chiral topological semimetal with multifold band crossings and long Fermi arcs. Nature Physics, 15, 759-765. doi:10.1038/s41567-019-0511-y.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-BD81-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7554-A
Genre: Journal Article

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Schröter, Niels B. M.1, Author
Pei, Ding1, Author
Vergniory, Maia G.1, Author
Sun, Yan2, Author              
Manna, Kaustuv2, Author              
de Juan, Fernando1, Author
Krieger, Jonas A.1, Author
Süß, Vicky2, Author              
Schmidt, Marcus3, Author              
Dudin, Pavel1, Author
Bradlyn, Barry1, Author
Kim, Timur K.1, Author
Schmitt, Thorsten1, Author
Cacho, Cephise1, Author
Felser, Claudia4, Author              
Strocov, Vladimir N.1, Author
Chen, Yulin1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Topological semimetals in crystals with a chiral structure (which possess a handedness due to a lack of mirror and inversion symmetries) are expected to display numerous exotic physical phenomena, including fermionic excitations with large topological charge 1 , long Fermi arc surface states 2,3 , unusual magnetotransport 4 and lattice dynamics 5 , as well as a quantized response to circularly polarized light 6 . So far, all experimentally confirmed topological semimetals exist in crystals that contain mirror operations, meaning that these properties do not appear. Here, we show that AlPt is a structurally chiral topological semimetal that hosts new four-fold and six-fold fermions, which can be viewed as a higher spin generalization of Weyl fermions without equivalence in elementary particle physics. These multifold fermions are located at high symmetry points and have Chern numbers larger than those in Weyl semimetals, thus resulting in multiple Fermi arcs that span the full diagonal of the surface Brillouin zone. By imaging these long Fermi arcs, we experimentally determine the magnitude and sign of their Chern number, allowing us to relate their dispersion to the handedness of their host crystal. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.

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Language(s): eng - English
 Dates: 2019-05-062019-05-06
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41567-019-0511-y
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 15 Sequence Number: - Start / End Page: 759 - 765 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850