Fig. 2.

Rashba-like band splitting around the M point. a Rashba-like band splitting in PtBi₂ at the M point, shown along the Γ–M–Γ direction (indicated by the blue line in the inset of b) measured by angle-resolved photoemission spectroscopy (ARPES) (hν = 9 eV). b Black circles show peak positions of the momentum distribution curves (MDCs) extracted from the ARPES data in a, while red lines represent the corresponding calculated bulk bands. The left inset shows the surface Brillouin zone (BZ) of PtBi₂. c–k Constant-energy contours obtained by integrating the photoemission spectral weight over a 10 meV energy window at binding energies as labeled