Figure 4
From: Atomic and electronic structure of an alloyed topological insulator, Bi1.5Sb0.5Te1.7Se1.3
Band structure and FT of the STS.
(a), (c) and (e) are schematics of constant energy contours in k space and (b), (d) and (f) are corresponding FT maps in q space, at VB = 440, 280 and 140 mV, respectively. Prominent scattering vectors, such as the ones from backscattering (qb) and the warping effect (qwM and qwK), are plotted as dotted lines and solid lines, respectively. (g), A line-cut of the FT maps along the Γ-K and Γ-M directions stacked along the bias voltage, VB. The colour scale indicates the amplitude of the FT, the x axis corresponds to the scattering vector q (≡|q|) and the y axis corresponds to VB. A schematic of the band structure is drawn on the right hand side, where the bulk band is coloured in grey and the surface band is coloured in blue and red for spins up and down, respectively.
