Figure 4

Contour plots of the deformation charge density (∆ ρ ₁ and ∆ ρ ₂ ). (a, b) ∆ρ₁ on the planes passing through germanene and sulfur layers in the Ger/MoS₂ superlattice. (c, d) ∆ρ₁ on the planes passing through silicene and sulfur layers in the Sil/MoS₂ system. (e, f) ∆ρ₁ on the planes perpendicular to the atomic layers and passing through Mo-S, Ge-Ge, or Si-Si bonds in the superlattices. (g, h) Charge density differences (∆ρ₂) of the same planes as those in (e) and (f). The green/blue, purple, and yellow balls represent Ge/Si, Mo, and S atoms, respectively. Orange and blue lines correspond to Δρ > 0 and Δρ < 0, respectively.