Figure 4
Effect of the spin-orbital coupling on the Dirac band in SrMnBi2 and CaMnBi2.
(a). Asymmetric Dirac band measured on SrMnBi2 along the Γ-M direction (cut G in Fig. 2a, dashed red line). It is the second derivative image with respect to the momentum. (b). Calculated band structure across the Dirac cone along the Γ-M direction in SrMnBi2 without considering spin-orbital coupling (dashed pink lines) and with spin-orbital coupling (thick blue lines). (c). Asymmetric Dirac band measured on CaMnBi2 along the Γ-M direction (cut H in Fig. 3a, dashed red line). It is the second derivative image with respect to the momentum. (d). Calculated band structure across the Dirac cone along the Γ-M direction in CaMnBi2 without considering spin-orbital coupling (dashed black lines) and with spin-orbital coupling (thick green lines).
