Figure 4: Switching between topological Dirac-cone and Rashba states.
From: Topological proximity effect in a topological insulator hybrid
(a) Schematic illustration of the hybridization between the Rashba-split Bi bands and the topological surface state (SS) of TlBiSe2. Horizontal dashed line in the right panel indicates the location of the chemical potential (μ) in our sample. Blue (red) curves indicate the clockwise- (anticlockwise-) rotating spin texture. (b,c) Calculated band structure for the slab of 1BL Bi on TlBiS2 and TlBiSe2, respectively. Spin texture is indicated by circles overlaid on the band dispersion whose colour (blue/red) and radius represent the spin component (clockwise/anticlockwise rotation) and the spin-dependent p-orbital weight at the topmost Bi layer, respectively. Projection of the bulk bands of TlBi(S/Se)2 is shown by yellow shade. Black and red arrows in c indicate the positions of the Dirac point and the crossing between the Dirac cone and the SO band, respectively. The area enclosed by a rectangle around the 
point in c roughly corresponds to the energy region of the schematic band diagram in a. Inset to c shows the calculated band structure for the Se third layer around the Dirac cone, highlighting its small orbital weight in the surface state (circles are negligibly small in this scale).
