Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe2

Mingzhe Yan, Huaqing Huang, Kenan Zhang, Eryin Wang, Wei Yao, Ke Deng, Guoliang Wan, Hongyun Zhang, Masashi Arita, Haitao Yang, Zhe Sun, Hong Yao, Yang Wu (), Shoushan Fan, Wenhui Duan () and Shuyun Zhou ()
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Mingzhe Yan: Tsinghua University
Huaqing Huang: Tsinghua University
Kenan Zhang: Tsinghua University
Eryin Wang: Tsinghua University
Wei Yao: Tsinghua University
Ke Deng: Tsinghua University
Guoliang Wan: Tsinghua University
Hongyun Zhang: Tsinghua University
Masashi Arita: Hiroshima University
Haitao Yang: Tsinghua University
Zhe Sun: University of Science and Technology of China
Hong Yao: Tsinghua University
Yang Wu: Tsinghua University
Shoushan Fan: Tsinghua University
Wenhui Duan: Tsinghua University
Shuyun Zhou: Tsinghua University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Topological semimetals have recently attracted extensive research interests as host materials to condensed matter physics counterparts of Dirac and Weyl fermions originally proposed in high energy physics. Although Lorentz invariance is required in high energy physics, it is not necessarily obeyed in condensed matter physics, and thus Lorentz-violating type-II Weyl/Dirac fermions could be realized in topological semimetals. The recent realization of type-II Weyl fermions raises the question whether their spin-degenerate counterpart—type-II Dirac fermions—can be experimentally realized too. Here, we report the experimental evidence of type-II Dirac fermions in bulk stoichiometric PtTe2 single crystal. Angle-resolved photoemission spectroscopy measurements and first-principles calculations reveal a pair of strongly tilted Dirac cones along the Γ-A direction, confirming PtTe2 as a type-II Dirac semimetal. Our results provide opportunities for investigating novel quantum phenomena (e.g., anisotropic magneto-transport) and topological phase transition.

Date: 2017
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DOI: 10.1038/s41467-017-00280-6

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