Spin degeneracy is symmetry-protected in the kz=0 and ky=0 planes of hexagonal MnTe, while spin splitting appears elsewhere except on nodal lines.
(A7) suggests u + 2v = √ 3a 2π ky = h, a constant, yielding (18) u = h − 2v for ky = constant
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Altermagnetic spin splitting and symmetry-enforced partial spin degeneracy in hexagonal MnTe
Spin degeneracy is symmetry-protected in the kz=0 and ky=0 planes of hexagonal MnTe, while spin splitting appears elsewhere except on nodal lines.