Node line semimetal states in tungsten-based materials

Node line semimetals (NLSMs) were characterized by one-dimensional band crossings in their bulk electronic structures. The nontrivial band topology of NLSM gives rise to "drumhead" surface electronic excitations that exhibits exotic physical properties. The symmetries of crystalline provide the needed protection of node line from being gapped out by the perturbations that preserve the symmetry. The progress of NLSM in tungsten-based materials is reviewed with an emphasis on their symmetry-based protection, characteristic electronic band structures and their response to the spin–orbit coupling (SOC) and breaking of time-reversal symmetry. The potential exploration directions of tungsten-based NLSM in the future are also discussed.