Fig. 2
From: Study on electronic transport and optoelectronic properties of semiconductor 2D Ge₂Y₂ (Y = As, P, N)

(a) shows the band structure and density of states of the α-Ge₂P₂ monolayer. (b) shows the band structure and density of states of the β-Ge₂P₂ monolayer. (c) shows the band structure and density of states of the α-Ge₂N₂ monolayer. (d) shows the band structure and density of states of the β-Ge₂N₂ monolayer.