Figure 4. Band structure of Cd₃As₂ (112) surface measured at different K_z and its band structure evolution in the K_x-K_y plane.

(a). Band structure along Γ-M direction (cut A in (c)) measured using different photon energies at a temperature T = 45 K. Different photon energy corresponds to different K_z. The inner band highlighted with blue dashed line shows weak K_z dependence, while the outer band (marked as white dashed lines) shows an obvious change with K_z. (b). Band structure along several momentum cuts along Γ-K direction (cuts B1 to B5 in (c)) around Γ point in the K_x-K_y plane measured using 21.2 eV photon energy. The observed two sets of bands are fitted by hyperbolic function, shown as cyan dotted line for the inner band and white dahsed line for the outer band. The velocities used in the fitting functions are 1.4 eV· Å and 3.1 eV· Å for the outer band and inner band, respectively. (c). Location of the momentum cuts in the Brillouin zone. (d). Calculated band structures at different K_y in the K_x-K_y plane. Here, we use the same hyperbola functions for the calculated bands as those from fitting the measured bands in (b).