Figure 1: Structure for borophene.

(a) Top view. Atoms are categorized into top chains and bottom chains. The top chain includes atoms like 1, 4, and 7. The bottom chain includes atoms like 2, 3, 5, and 6. The unit cell is shown by blue rectangle. The first Brillouin zone is shown by red rectangle on the left. (b) Perspective view illustrates the puckered configuration, with h as the distance between the top and bottom chains along the out-of-plane z-direction. The pucker is perpendicular to the x-axis and is parallel with the y-axis.