Fig. 4: Experimental band structure and intrinsic SO splitting for bare MoSe2.

a Out-of-plane ARPES intensity map as a function kz in the hv range 700–850 eV along the ГA and KH directions. b In-plane ARPES intensity images measured at hv = 737 eV (left) and 715 eV (right), where k runs along the Г1K and AH directions of the 3D-BZ. c, d Zoom-ins of b near the Г1- and H-hotspots (marked) with the corresponding EDC and −d2I/dE2 > 0 plots in these points. The horizontal dashes on the −d2I/dE2 > 0 plots mark the corresponding Δbs values, in this case identified with ΔSO.