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TT: Fachverband Tiefe Temperaturen

TT 20: Topological Semimetals II

TT 20.1: Talk

Monday, March 12, 2018, 15:00–15:15, A 053

Topological band crossings in hexagonal materials — •Andreas P. Schnyder — Max Planck Institute for Solid State Research, Stuttgart, Germany

Recently, topological nodal-line semimetals have become a topic of very active research, driven by the discovery of several new nodal-line materials. In this talk, I present a complete classification of all possible non-symmorphic nodal lines in hexagonal materials with strong spin-orbit coupling. The analysis is based on (i) the algebraic relations obeyed by the symmetry operators and (ii) the compatibility relations between irreducible representations at different high-symmetry points of the Brillouin zone. I present a number of existing materials where these non-symmorphic nodal lines are realized and discuss their DFT band structures. Based on these material examples, I discuss the surface states that are associated with the topological band crossings.