August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【143】Classification and higher-order topology of triple nodal points

Sep 2, 2021, 3:15 PM
Room A

Room A

Talk Condensed Matter Physics (KOND) Condensed Matter Physics


Patrick M. Lenggenhager (Paul Scherrer Institut)


We investigate triple nodal points, i.e., three-fold degeneracies of energy bands in the momentum space of three-dimensional crystalline solids. First, based on the symmetries required for their stability, we develop a classification of triple nodal points in weakly spin-orbit-coupled materials. Second, by combining the derived classification with symmetry indicators for corner charges, we find that pairs of triple points in semimetals are associated with monopole charges and higher-order topology. The higher-order bulk-boundary correspondence of such triple-point pairs is a quantized fractional jump in the momentum dependence of the electric charge localized at the crystal hinges. I will illustrate these results using first-principles calculations for the compound Sc$_3$AlC in applied strain.

Primary authors

Patrick M. Lenggenhager (Paul Scherrer Institut) Xiaoxiong Liu (University of Zurich) Stepan Tsirkin (University of Zürich ) Prof. Titus Neupert (University of Zurich) Dr Tomáš Bzdušek (Paul Scherrer Institut)

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