Figure 4 | Scientific Reports

Figure 4

From: Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects

Figure 4

Illustrations on the effects of the key physical parameters on topological phase transitions.

(a), Weak interfacial coupling. (b & c), Moderate interfacial coupling, but with different spin-orbit coupling strengths. (d), Strong interfacial coupling. The red triangles denote the TSS; the solid and dotted black curves correspond to the valence bands of the CI and the Fermi level of the heterostructures, respectively.

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