Figure 3
From: A new kind of 2D topological insulators BiCN with a giant gap and its substrate effects
Electronic structure and topology.
(a) The bandstructure of intrinsic BiCN with SOC (red line) and without SOC (black line). The green and blue line indicates the pz and px/py orbital character respectively. The thicker line means the greater weight of certain orbital. (b) The parity table of the twelve pairs of the occupied double-degenerated valence bands at Γ and three M points. The positive and negative values stand for even and odd parity respectively. The product of those parities at each k is given at the right brackets. (c) Bandstructure of zigzag nanoribbon with width of N = 12 (5.44 nm). The red line represents the helical edge state and the gray line represents the bulk state. The K (K′) in brackets means the 1D projection of K(K′) in 2D BZ. (d) Charge density distribution in real space of the edge state near π point shown in (c).
