Figure 3
From: Substitution-induced spin-splitted surface states in topological insulator (Bi1−xSbx)2Te3
Energy-Momentum dispersion of surface states.
(a) The radial integral FFT intensity as a function of distance from Γ point in FFT images with different bias voltages. The blue and red dots mark the peaks corresponding to positions of bright spots in FFT images. The insets show the typical FFT images at high (on the left top) and low energy region (on the right bottom), respectively. (b) Schematics of constant energy contours (CEC) in k space at high and low energy regions. The dash lines in CEC at high energy regions are the average value of inner and outer parts of CEC. The arrows represent the possible quasiparticle scattering channels (qH and qL). (c)–(f) Energy-momentum (E–k) dispersion of surface states in (Bi1−xSbx)2Te3 films with different x values. The solid circles and squares represent momentums of the states at low and high energy regions, respectively. The momentum k is determined by the q = √3 k, in which the q values and error bars are determined from the peak positions and FWHM in (a). The pink bar shows the evolution of position of Dirac Point with different x values.
