Alternating stacks of an insulator monolayer and a metallic monolayer with C3 symmetry and three mirror planes can host triple points, nexus points, and tangle nodal lines, demonstrated with HBN and boron sheets.
Liu et al., Science 343, 864 (2014)
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Design triple points, nexus points and related topological phases by stacking monolayers
Alternating stacks of an insulator monolayer and a metallic monolayer with C3 symmetry and three mirror planes can host triple points, nexus points, and tangle nodal lines, demonstrated with HBN and boron sheets.