Projective Representations Construction for Different Points of Brillouin Zone. Application for Space Symmetry Groups P4₁ 2₁ 2 and P4₃ 2₁ 2

Original · EN

It was suggested method of constructing of irreducible projective representations in different points of Brilluin zone. Points Γ, Λ, Z, S, A, Σ, M, V, R, and X of space symmetry groups P4₁2₁2 and P4₃2₁2 were examined. At each of these points one- and two-valued irreducible projective representations of wave vector groups were constructed for two enantiomorphous modifications. Influence of time inversion at these points also was taken into consideration by means of Herring criterion.