Journal
NPJ 2D MATERIALS AND APPLICATIONS
Volume 1, Issue -, Pages 1-6Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41699-017-0032-4
Keywords
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Funding
- Ministry of Science and Technology [2017YFA0204803]
- National Natural Science Fund [21525311, 21373045, 11404056]
- Jiangsu 333 project [BRA2016353]
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We predict a stable eight-coordinate two-dimensional RuS4 monolayer, with a trilayer S-Ru-S and pentagonal rings tiling configuration by first-principles calculations. This monolayer exhibits unique anisotropic quadratic energy dispersion with two Dirac points emerging at the high-symmetric G point. When the spin-orbit coupling is included, a large nontrivial energy gap (70 meV) appears near the Fermi level. The topological nature of RuS4 monolayer is also confirmed by the nontrivial Z(2) invariant and gapless edge states. A four-band tight-binding model is further proposed, which reveals that the topological states arise from the indirect interaction of the Ru-dxz and dyz orbitals.
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