Influence of the N'eel vector on the bulk electronic structure of MnTe measured from the (1 1 00) surface

Altermagnetism gives rise to momentum-dependent spin splitting without net magnetization. Here, we use angle-resolved photoemission spectroscopy (ARPES) to investigate bulk α-MnTe single crystals cleaved along the (1 00) plane - an orientation that preserves the compensated magnetic symmetry at the surface and substantially reduces surface effects and k z broadening. We resolve the three-dimensional bulk band structure with markedly enhanced spectral clarity. The d-wave band splitting, driven by the altermagnetic order and spin-orbit coupling in the Γ-K-M nodal plane, shows a perfect match to theoretical predictions. We further establish that the valence-band maximum occurs near the A point, identifying the corresponding hole pockets as the states governing the transport properties. Spatially resolved measurements reveal systematic variations of the band dispersion along Γ-K and A-L, associated with different pinning of the Néel vector at the surface. Our results establish a surface-sensitive route to resolving the bulk altermagnetic electronic structure of MnTe and provide direct spectroscopic evidence for Néel-vector-dependent band splitting.