Type-II Dirac fermions in the PtSe 2 class of transition metal dichalcogenides

By Huaqing Huang, Shuyun Zhou, Wenhui Duan. 2016

148 citations recorded by the source corpus.

Recently, a new ``type-II'' Weyl fermion, which exhibits exotic phenomena, such as an angle-dependent chiral anomaly, was discovered in a new phase of matter where electron and hole pockets contact at isolated Weyl points [Nature (London) 527, 495 (2015)]. This raises an interesting question about whether its counterpart, i.e., a type-II Dirac fermion, exists in real materials. Here, we predict the existence of symmetry-protected type-II Dirac fermions in a class of transition metal dichalcogenide materials. Our first-principles calculations on ${\mathrm{PtSe}}_{2}$ reveal its bulk type-II Dirac fermions which are characterized by strongly tilted Dirac cones, novel surface states, and exotic doping-driven Lifshitz transition. Our results show that the existence of type-II Dirac fermions in ${\mathrm{PtSe}}_{2}$-type materials is closely related to its structural $P\overline{3}m1$ symmetry, which provides useful guidance for the experimental realization of type-II Dirac fermions and intriguing physical properties distinct from those of the standard Dirac fermions known before.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/095faf7ce052f5d07a543fa7e4dd5fc85f322cd8

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In Atomic and Molecular Physics, and Optics

  1. Heng Gao
  2. Youngkuk Kim
  3. J. Venderbos
  4. Andrew M. Rappe

In Materials Chemistry

  1. Heng Gao
  2. Youngkuk Kim
  3. J. Venderbos
  4. Andrew M. Rappe

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