Fig. 4.

Weyl-like points in the surface band structure of NbGeSb. a Band dispersions around the like-spin protected crossing (#4 from Fig. 3c) as calculated from our tight-binding model. Orbital (top) and spin (bottom) angular momenta extracted around the indicated contour are shown as insets; the arrows represent the direction of the angular momenta. The OAM shows a characteristic winding around the contour with winding number $-1$, unlike for the spin which exhibits only slight canting around the contour. b Equivalent calculations around the weakly gapped crossing (#3 in Fig. 3c). Now both the orbital (top inset) and spin (bottom inset) angular momenta exhibit winding around the indicated contour, with winding numbers $-1$ and $+1$, respectively, but the majority of the winding is restricted in close proximity to the mirror line, as can be seen in the magnified insets.