Atomic structures of void-containing 1T-PtTe₂ monolayer. (a) Top and side view of Pt₄Te₇, in which one Te atom in the first atomic layer is removed in a 2 × 2 supercell, making the first layer looks like a Kagome pattern. (b) Top and side view of α-Pt₄Te₆, in which one Te atom from the first layer and one nearest-neighbor Te atom from the third layer are removed in a supercell. (c) Top and side view of β-Pt₄Te₆, in which two Te atoms from the first layer are removed in a supercell. (d) Top and side view of γ-Pt₄Te₆, in which one Te atom from the first layer and one next nearest-neighboring Te atom from the third layer are removed in a supercell. The supercell is shown in a black box. The Te atoms in the first and third atomic layers are represented by light orange and dark orange, respectively. The Pt atoms in the second atomic layer are represented by blue. For clarity, the atoms in the first atomic layer magnified, while the side view only shows the nearby atoms containing voids.