Correlations in Novel Quantum Materials 2023 (CNQM2023)

Symmetry-enforced Z2 topology

24 Jul 2023, 16:45

2h 45m

2D5 (MPI-FKF)

Contributed Poster Poster Session

Speaker

Kirill Parshukov (MPI-FKF)

Description

In this work, we study symmetry-enforced Z2 topology in non-magnetic centrosymmetric materials in both regimes of strong and negligible spin-orbit coupling. We provide a classification of space groups, enforcing non-trivial topological Z${}_2$ invariant. For the space groups, we list planes in the Brillouin zone that are topological at half-filling. The classification implies the existence of Dirac nodal lines for materials with negligible spin-orbit coupling. At the same time, the strong spin-orbit coupling opens a gap in the bulk. Due to the non-trivial Z${}_2$ invariant, gapless symmetry-enforced states must emerge at the material surface. Also, we provide examples of materials for experimental observation.