Figure 2: Spin-resolved DFT surface electronic structure calculations. | Nature Communications

Figure 2: Spin-resolved DFT surface electronic structure calculations.

From: Bi1Te1 is a dual topological insulator

Figure 2

Band structure along of slabs of Bi1Te1 terminated by (a) 2QLs and (b,c) 1QL. The size of the symbols corresponds to the spin polarization in the first four layers of a slab, the colour (red/blue) indicates the orientation of the spins with respect to a direction perpendicular to the momentum and surface normal. The green circle marks the Dirac cone of the TCI. In c (QL′), the symmetry has been broken by strain along [100] direction, such that is no longer a high-symmetry line and a gap opening can be observed (see inset).

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