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Nie S, Xu G, Prinz FB, et al. Topological semimetal in honeycomb lattice LnSI. Proc Natl Acad Sci U S A. 2017;114(40):10596-10600doi: 10.1073/pnas.1713261114.
Nie, S., Xu, G., Prinz, F. B., & Zhang, S. C. (2017). Topological semimetal in honeycomb lattice LnSI. Proceedings of the National Academy of Sciences of the United States of America, 114(40), 10596-10600. https://doi.org/10.1073/pnas.1713261114
Nie, Simin, et al. "Topological semimetal in honeycomb lattice LnSI." Proceedings of the National Academy of Sciences of the United States of America vol. 114,40 (2017): 10596-10600. doi: https://doi.org/10.1073/pnas.1713261114
Nie S, Xu G, Prinz FB, Zhang SC. Topological semimetal in honeycomb lattice LnSI. Proc Natl Acad Sci U S A. 2017 Oct 03;114(40):10596-10600. doi: 10.1073/pnas.1713261114. Epub 2017 Sep 19. PMID: 28928149; PMCID: PMC5635928.
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Proc Natl Acad Sci U S A. 2017 Oct 03;114(40):10596-10600. doi: 10.1073/pnas.1713261114. Epub 2017 Sep 19.

Topological semimetal in honeycomb lattice LnSI.

Proceedings of the National Academy of Sciences of the United States of America

Simin Nie, Gang Xu, Fritz B Prinz, Shou-Cheng Zhang

Affiliations

  1. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
  2. Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  3. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China; [email protected].
  4. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
  5. Department of Physics, Stanford University, Stanford, CA 94305-4045.

PMID: 28928149 PMCID: PMC5635928 DOI: 10.1073/pnas.1713261114

Abstract

Recognized as elementary particles in the standard model, Weyl fermions in condensed matter have received growing attention. However, most of the previously reported Weyl semimetals exhibit rather complicated electronic structures that, in turn, may have raised questions regarding the underlying physics. Here, we report promising topological phases that can be realized in specific honeycomb lattices, including ideal Weyl semimetal structures, 3D strong topological insulators, and nodal-line semimetal configurations. In particular, we highlight a semimetal featuring both Weyl nodes and nodal lines. Guided by this model, we showed that GdSI, the long-perceived ideal Weyl semimetal, has two pairs of Weyl nodes residing at the Fermi level and that LuSI (YSI) is a 3D strong topological insulator with the right-handed helical surface states. Our work provides a mechanism to study topological semimetals and proposes a platform for exploring the physics of Weyl semimetals as well as related device designs.

Keywords: Fermi arc; honeycomb lattice; ideal Weyl fermion; nodal-line semimetal; topological insulator

Conflict of interest statement

The authors declare no conflict of interest.

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