Cat's-cradle-like Dirac semimetals in layer groups with multiple screw axes: Application to two-dimensional borophene and borophane
Cat's-cradle-like Dirac semimetals in layer groups with multiple screw axes: Application to two-dimensional borophene and borophane
Recently, the crystal symmetry-protected topological semimetals have aroused extensive interest, especially the nonsymmorphic symmetry-protected one. We list the possible nonmagnetic topological semimetals and develop their $k\ifmmode\cdot\else\textperiodcentered\fi{}p$ Hamiltonian in all layer groups with multiple screw axes in the absence of spin-orbital coupling. We find a cat's-cradle-like topological semimetal phase which looks …