Finite size effects on the helical edge states on the Lieb lattice
Chen Rui, Zhou Bin†,
       

(a) Energy spectrum of edge states under bearded boundary condition with n = 15 for λ = 0, 0.05t, and 0.2t. (b) The variation of the gap ΔE with λ for different n. (c) The variation of the gap ΔE with n for different λ.