Figure 1
From: Fermi-crossing Type-II Dirac fermions and topological surface states in NiTe2
(a) Crystal structure of 1T-NiTe2 (space group: P-3m1), composed of hexagonal basal planes (ab-planes) of Ni-atom (red sphere) coordinated to the Ni-atom at the centre and triangular layers with inequivalent Te atomic site (blue sphere) above (Te-1) and below (Te-2) the basal plane along the (001)-direction18. The hopping parameters between 2-site Te p-orbitals are categorised as intra-layer hopping (t1 = t2), interlayer hopping (t3) within the unit cell and between two unit cells (t4). (b) Brillouin zone. (c) Hierarchy of p-orbital derived energy levels at Γ and A-point showing the inverted band gaps (IBG), Dirac points (BDP: circled) and topological states. The symmetry of the states are labelled with IREPs (Γi, Aj, Δk) and parity (+/−). Inspired from Ref.7,10. Figure made using Adobe Illustrator 30.
