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Topological origin of the type-II Dirac fermions in PtSe2

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Kumar,  Nitesh
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yan,  Binghai
Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Li, Y., Xia, Y., Ekahana, S. A., Kumar, N., Jiang, J., Yang, L., et al. (2017). Topological origin of the type-II Dirac fermions in PtSe2. Physical Review Materials, 1(7): 074202, pp. 1-9. doi:10.1103/PhysRevMaterials.1.074202.


Cite as: http://hdl.handle.net/21.11116/0000-0000-27C8-3
Abstract
Group VIII transition-metal dichalcogenides have recently been proposed to host type-II Dirac fermions. They are Lorentz-violating quasiparticles marked by a strongly tilted conic dispersion along a certain momentum direction and therefore have no analogs in the standard model. Using high-resolution angle-resolved photoemission spectroscopy, we systematically studied the electronic structure of PtSe2 in the full three-dimensional Brillouin zone. As predicted, a pair of type-II Dirac crossings is experimentally confirmed along the k(z) axis. Interestingly, we observed conic surface states around time-reversal-invariant momenta (Gamma) over bar and (M) over bar points. The signatures of nontrivial topology are confirmed by the first-principles calculation, which shows an intricate parity inversion of bulk states. Our discoveries not only contribute to a better understanding of topological band structure in PtSe2 but also help further explore the exotic properties, as well as potential application, of group VIII transition-metal dichalcogenides.