Composite Weyl nodes stabilized by screw symmetry with and without time reversal

Stepan S. Tsirkin, Ivo Souza, David Vanderbilt

We classify the band degeneracies in 3D crystals with screw symmetry $n_m$ and broken $\mathcal{P}\ast \mathcal{T}$ symmetry, where $\mathcal{P}$ stands for spatial inversion and $\mathca…