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  Observation of a singular Weyl point surrounded by charged nodal walls in PtGa

Ma, J.-Z., Wu, Q.-S., Song, M., Zhang, S.-N., Guedes, E. B., Ekahana, S. A., et al. (2021). Observation of a singular Weyl point surrounded by charged nodal walls in PtGa. Nature Communications, 12(1): 3994, pp. 1-8. doi:10.1038/s41467-021-24289-0.

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Ma, J.-Z.1, Author
Wu, Q.-S.1, Author
Song, M.1, Author
Zhang, S.-N.1, Author
Guedes, E. B.1, Author
Ekahana, S. A.1, Author
Krivenkov, M.1, Author
Yao, M. Y.2, Author              
Gao, S.-Y.1, Author
Fan, W.-H.1, Author
Qian, T.1, Author
Ding, H.1, Author
Plumb, N. C.1, Author
Radovic, M.1, Author
Dil, J. H.1, Author
Xiong, Y.-M.1, Author
Manna, K.2, Author              
Felser, C.3, Author              
Yazyev, O. V.1, Author
Shi, M.1, Author
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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 Abstract: Constrained by the Nielsen-Ninomiya no-go theorem, in all so-far experimentally determined Weyl semimetals (WSMs) the Weyl points (WPs) always appear in pairs in the momentum space with no exception. As a consequence, Fermi arcs occur on surfaces which connect the projections of the WPs with opposite chiral charges. However, this situation can be circumvented in the case of unpaired WP, without relevant surface Fermi arc connecting its surface projection, appearing singularly, while its Berry curvature field is absorbed by nontrivial charged nodal walls. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, we show experimentally that a singular Weyl point emerges in PtGa at the center of the Brillouin zone (BZ), which is surrounded by closed Weyl nodal walls located at the BZ boundaries and there is no Fermi arc connecting its surface projection. Our results reveal that nontrivial band crossings of different dimensionalities can emerge concomitantly in condensed matter, while their coexistence ensures the net topological charge of different dimensional topological objects to be zero. Our observation extends the applicable range of the original Nielsen-Ninomiya no-go theorem which was derived from zero dimensional paired WPs with opposite chirality. In all experimentally observed Weyl semimetals so far, the Weyl points always appear in pairs in the momentum space. Here, the authors report one unpaired Weyl point without surface Fermi arc emerging at the center of the Brillouin zone, which is surrounded by charged Weyl nodal walls in PtGa.

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Language(s): eng - English
 Dates: 2021-06-282021-06-28
 Publication Status: Published in print
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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: 12 (1) Sequence Number: 3994 Start / End Page: 1 - 8 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723