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  Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2

Morali, N., Batabyal, R., Nag, P. K., Liu, E., Xu, Q., Sun, Y., et al. (2019). Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2. Science, 365(6459), 1286-1291. doi:10.1126/science.aav2334.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-B856-C Version Permalink: http://hdl.handle.net/21.11116/0000-0004-B85B-7
Genre: Journal Article

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 Creators:
Morali, Noam1, Author
Batabyal, Rajib1, Author
Nag, Pranab Kumar1, Author
Liu, Enke2, Author              
Xu, Qiunan2, Author              
Sun, Yan2, Author              
Yan, Binghai1, Author
Felser, Claudia3, Author              
Avraham, Nurit1, Author
Beidenkopf, Haim1, 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: Weyl semimetals (WSMs)—}materials that host exotic quasiparticles called Weyl fermions{—}must break either spatial inversion or time-reversal symmetry. A number of WSMs that break inversion symmetry have been identified, but showing unambiguously that a material is a time-reversal-breaking WSM is tricky. Three groups now provide spectroscopic evidence for this latter state in magnetic materials (see the Perspective by da Silva Neto). Belopolski et al. probed the material Co2MnGa using angle-resolved photoemission spectroscopy, revealing exotic drumhead surface states. Using the same technique, Liu et al. studied the material Co3Sn2S2, which was complemented by the scanning tunneling spectroscopy measurements of Morali et al. These magnetic WSM states provide an ideal setting for exotic transport effects.Science, this issue p. 1278, p. 1282, p. 1286; see also p. 1248Bulk{–}surface correspondence in Weyl semimetals ensures the formation of topological {“}Fermi arc{”} surface bands whose existence is guaranteed by bulk Weyl nodes. By investigating three distinct surface terminations of the ferromagnetic semimetal Co3Sn2S2, we verify spectroscopically its classification as a time-reversal symmetry-broken Weyl semimetal. We show that the distinct surface potentials imposed by three different terminations modify the Fermi-arc contour and Weyl node connectivity. On the tin (Sn) surface, we identify intra{–Brillouin zone Weyl node connectivity of Fermi arcs, whereas on cobalt (Co) termination, the connectivity is across adjacent Brillouin zones. On the sulfur (S) surface, Fermi arcs overlap with nontopological bulk and surface states. We thus resolve both topologically protected and nonprotected electronic properties of a Weyl semimetal.

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Language(s): eng - English
 Dates: 2019-09-202019-09-20
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1126/science.aav2334
BibTex Citekey: Morali1286
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Title: Science
  Other : Science
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Association for the Advancement of Science
Pages: - Volume / Issue: 365 (6459) Sequence Number: - Start / End Page: 1286 - 1291 Identifier: ISSN: 0036-8075
CoNE: https://pure.mpg.de/cone/journals/resource/991042748276600_1