Fig. 1
From: Study on electronic transport and optoelectronic properties of semiconductor 2D Ge₂Y₂ (Y = As, P, N)

The top and side views of (a) α-Ge₂Y₂ and (b) β-Ge₂Y₂ monolayers. (c) shows the band structure and density of states of the α-Ge₂As₂ monolayer. (d) shows the band structure and density of states of the β-Ge₂As₂ monolayer.