Electrical conductivity of antiferromagnetic Dirac quasi-particles

Yamamoto, Kei   ; Smejkal, L.*; Jungwirth, T.*; Sinova, J.*

We study the influence of a change in Neel vector orientation on electrical conductivity in antiferromagnetic Dirac nodal-point and nodal-line semimetals. In certain PT symmetric antiferromagnetic materials, such as CuMnAs, protected anti-crossings occur when the Neel vector is oriented along a crystallographic high-symmetry axis. By an explicit computation for model tight-binding Hamiltonians, we demonstrate that the transition between gapless and gapped phases mediated by the rotation of Neel vector manifests itself in a strong orientation dependence o electrical conductivity.