Figure 4. Iso-energy contour interconnectivity on the surface of Mo_xW_1−xTe₂.

(a) Schematic illustration of the surface and bulk electronic structure on a constant energy E₁. The shaded areas represent the projected bulk bands, whereas the red line show the surface states. (b) Schematic illustration of the surface and bulk electronic structure on two energies E₁ and E₂. The band structure on E₁ (E₂) are shown by the solid (dotted) lines. The energies E₁ and E₂ are defined in c. (c) Band structure along a k space cut that goes through the direct pair of Weyl nodes, W1(−) and W2(+). The dotted lines denote the energies E₁ and E₂ with respect to the W1 and W2 Weyl nodes. (d) Calculated surface and bulk electronic structure on at the energy E₁ over the top half of the surface BZ. (e) A zoomed-in view of d for the area highlighted by the blue box. (f) The same as e but at the energy E₂. (g–i) Schematic band diagram to show the evolution of the Mo_xW_1−xTe₂ system as a function of Mo concentration x. (j) The length of the Fermi arc as a function of Mo concentration x. The arc length equals the k space separation of the Weyl nodes.