Symmetry-enforced band crossings in trigonal materials: Accordion states and Weyl nodal lines

Y. -H. Chan, Berkay Kilic, Moritz M. Hirschmann +4

Nonsymmoprhic symmetries, such as screw rotations or glide reflections, can enforce band crossings within high-symmetry lines or planes of the Brillouin zone. When these band degen…