SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 6: Topological Semimetals

TT 6.2: Talk

Monday, March 27, 2023, 09:45–10:00, HSZ 304

Automatic generation and topological classification of low-energy Hamiltonians at multi-fold degeneracies — •Kirill Alpin — Max Planck Institute for Solid State Research, Stuttgart, Germany

In this talk, we show a method of generating general high-symmetry Hamiltonian with the goal of topologically classifying all possible multi-fold crossings in bandstructures of condensed matter systems. To do so, we found all higher-dimensional irreducible representations at all high-symmetry points in all space groups. The topological phase diagrams of the automatically generated low-energy Hamiltonian at these k-points were mapped out. During this process, we identified a prevalent topological phase with an unusually high Chern number of 5 in multi-fold point crossings. A material was found featuring this topological phase. Further ab-initio calculations of this materials surface DOS showed a high number of Fermi arcs.