Highlights 2022
Charge dynamics of a noncentrosymmetric magnetic Weyl semimetal
The family of the noncentrosymmetric RAlGe (R = rare-earth) materials is a suitable arena in order to advance our knowledge on novel topological states which cover all varieties of Weyl semimetals, including type-I, type-II, inversion and time-reversal breaking symmetry, depending on the choice of the rare-earth element. The ferromagnetic PrAlGe is of particular relevance, since it breaks both the space-inversion and time-reversal symmetry, leading to the formation of pairs of type-I Weyl nodes. We study its broadband charge dynamics (i.e., longitudinal optical conductivity) and reveal its electronic environment, based on correlated Weyl states, which favours an unusually large anomalous Hall conductivity (AHC) at low temperatures. We thus propose a suitable experimental approach in order to trace the relevant ingredients of the electronic structure deploying substantial Berry curvatures, the necessary prerequisite for an intrinsic AHC.