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  Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet

Belopolski, I., Manna, K., Sanchez, D. S., Chang, G., Ernst, B., Yin, J., et al. (2019). Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. Science, 365(6459), 1278-1281. doi:10.1126/science.aav2327.

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Belopolski, Ilya1, Author
Manna, Kaustuv2, Author           
Sanchez, Daniel S.1, Author
Chang, Guoqing1, Author
Ernst, Benedikt2, Author           
Yin, Jiaxin1, Author
Zhang, Songtian S.1, Author
Cochran, Tyler1, Author
Shumiya, Nana1, Author
Zheng, Hao1, Author
Singh, Bahadur1, Author
Bian, Guang1, Author
Multer, Daniel1, Author
Litskevich, Maksim1, Author
Zhou, Xiaoting1, Author
Huang, Shin-Ming1, Author
Wang, Baokai1, Author
Chang, Tay-Rong1, Author
Xu, Su-Yang1, Author
Bansil, Arun1, Author
Felser, Claudia3, Author           Lin, Hsin1, AuthorHasan, M. Zahid1, Author more..
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. 1248Topological matter is known to exhibit unconventional surface states and anomalous transport owing to unusual bulk electronic topology. In this study, we use photoemission spectroscopy and quantum transport to elucidate the topology of the room temperature magnet Co2MnGa. We observe sharp bulk Weyl fermion line dispersions indicative of nontrivial topological invariants present in the magnetic phase. On the surface of the magnet, we observe electronic wave functions that take the form of drumheads, enabling us to directly visualize the crucial components of the bulk-boundary topological correspondence. By considering the Berry curvature field associated with the observed topological Weyl fermion lines, we quantitatively account for the giant anomalous Hall response observed in this magnet. Our experimental results suggest a rich interplay of strongly interacting electrons and topology in quantum matter.


Language(s): eng - English
 Dates: 2019-09-202019-09-20
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1126/science.aav2327
BibTex Citekey: Belopolski1278
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Title: Science
  Other : Science
Source Genre: Journal
Publ. Info: Washington, D.C. : American Association for the Advancement of Science
Pages: - Volume / Issue: 365 (6459) Sequence Number: - Start / End Page: 1278 - 1281 Identifier: ISSN: 0036-8075
CoNE: https://pure.mpg.de/cone/journals/resource/991042748276600_1