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. 2016 Mar 25;2(3):e1501536. doi: 10.1126/sciadv.1501536

Fig. 1. Optical parameters of topological insulator BSTS single crystals.

Fig. 1

(A) Refractive index, n, and extinction coefficient, k, of the insulating bulk of topological insulator BSTS crystals. The inset shows the intrinsic structures of topological insulator BSTS single crystals with surface states and bulk states. (B) Dielectric function, ε, of the insulating bulk of topological insulator BSTS nanocones. (C) Refractive index, n, and extinction coefficient, k, of the metallic surface of topological insulator BSTS crystals. (D) Dielectric function, ε, of the metallic surface of topological insulator BSTS crystals.