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.
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Primary author
Kirill Parshukov
(MPI-FKF)
