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  Topological chiral crystals with helicoid-arc quantum states

Sanchez, D. S., Belopolski, I., Cochran, T. A., Xu, X., Yin, J.-X., Chang, G., et al. (2019). Topological chiral crystals with helicoid-arc quantum states. Nature, 567(7749), 500-505. doi:10.1038/s41586-019-1037-2.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-63A1-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-63AA-E
Genre: Journal Article

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 Creators:
Sanchez, Daniel S.1, Author
Belopolski, Ilya1, Author
Cochran, Tyler A.1, Author
Xu, Xitong1, Author
Yin, Jia-Xin1, Author
Chang, Guoqing1, Author
Xie, Weiwei1, Author
Manna, Kaustuv2, Author              
Süß, Vicky2, Author              
Huang, Cheng-Yi1, Author
Alidoust, Nasser1, Author
Multer, Daniel1, Author
Zhang, Songtian S.1, Author
Shumiya, Nana1, Author
Wang, Xirui1, Author
Wang, Guang-Qiang1, Author
Chang, Tay-Rong1, Author
Felser, Claudia3, Author              
Xu, Su-Yang1, Author
Jia, Shuang1, Author
Lin, Hsin1, AuthorHasan, M. Zahid1, Author more..
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: The quantum behaviour of electrons in materials is the foundation of modern electronics and information technology(1-11), and quantum materials with topological electronic and optical properties are essential for realizing quantized electronic responses that can be used for next generation technology. Here we report the first observation of topological quantum properties of chiral crystals(6,7) in the RhSi family. We find that this material class hosts a quantum phase of matter that exhibits nearly ideal topological surface properties originating from the crystals' structural chirality. Electrons on the surface of these crystals show a highly unusual helicoid fermionic structure that spirals around two high-symmetry momenta, indicating electronic topological chirality. The existence of bulk multiply degenerate band fermions is guaranteed by the crystal symmetries; however, to determine the topological invariant or charge in these chiral crystals, it is essential to identify and study the helicoid topology of the arc states. The helicoid arcs that we observe on the surface characterize the topological charges of +/- 2, which arise from bulk higher-spin chiral fermions. These topological conductors exhibit giant Fermi arcs of maximum length (pi), which are orders of magnitude larger than those found in known chiral Weyl fermion semimetals(5,8-11). Our results demonstrate an electronic topological state of matter on structurally chiral crystals featuring helicoid-arc quantum states. Such exotic multifold chiral fermion semimetal states could be used to detect a quantized photogalvanic optical response, the chiral magnetic effect and other optoelectronic phenomena predicted for this class of materials(6).

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Language(s): eng - English
 Dates: 2019-03-282019-03-28
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000462655800045
DOI: 10.1038/s41586-019-1037-2
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 567 (7749) Sequence Number: - Start / End Page: 500 - 505 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238