Figure 3

(a) The atomic structure and (b) band structure along the armchair edges of a planar Sb honeycomb on 2 × 2 h-BN. (c) The atomic structure and (d) band structure along the armchair edges of a planar Bi honeycomb on 2 × 2 h-BN. The Dirac cone opens a gap due the symmetry breaking by the h-BN substrate.