(a) The crystal structure of Cd₃As₂, which has a distorted superstructure of the antifluorite structure type with a tetragonal unit cell in the cetrosymmetric I4₁/acd space group. (b) A small sub-cell of the overall structure of Cd₃As₂, in which the cubic Cd lattice with two vacancies resides in a face-centered cubic As lattice. The overall structure of Cd₃As₂ can be viewed as a 2 × 2 × 4 superstructure stacked from it. (c) The calculated electronic structure of Cd₃As₂. A band crossing merges along Γ–Z at the Fermi level, representative of Dirac point. (d) Bulk Brillouin zone of Cd₃As₂. Two 3D Dirac points (red dots) locate on the opposite sides of the Brillouin zone center point Γ along k_z direction.