Line Plot from Scientific Research

Band structure of the S region at different values of the scattering strength θ from an anomalous phase (θ < θc) to a Chern phase (θ > θc). The phase transition (PT) occurs at θc= 15°. The working phase φ0 of the topological heterostructure is highlighted by a dashed line. Modes localized to the top and bottom are shown in red and blue, respectively. The corresponding gap invariant Wψ and Chern number for bands from top to bottom are 1,1,1,1,1,1 and 0,0,0,0,0,0 for θ = 0° and 10°, PT for θ = 15°, 1,1,1,1,0,1 and 0,0,0,0,-1,1 for θ = 30°.

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