Figure 6

(a) Phase diagram of the existence of the zero-energy edge state for θa = θb ± π = 0 and θ + = 0. θ− and Δ are free parameters. (b) Energy spectra for Δ = 1

(a) Phase diagram of the existence of the zero-energy edge state for θa = θb ± π = 0 and θ + = 0. θ− and Δ are free parameters. (b) Energy spectra for Δ = 1