Influence of the Néel vector on the bulk electronic structure of MnTe measured from the (1 1̅ 00) surface
Abstract
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 (11̅00) plane - an orientation that preserves the compensated magnetic symmetry at the surface and substantially reduces surface effects and kz 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.
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BibTeX
@misc{usanov2026influence,
title = {{Influence of the Néel vector on the bulk electronic structure of MnTe measured from the $(1 \bar1 00)$ surface}},
author = {D. A. Usanov and A. B. Hellenes and S. Hahn and M. Leandersson and J. Osiecki and K. Uhlířová and D. Evtushinsky and L. Šmejkal and T. Jungwirth and J. H. Dil},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20383},
eprint = {2610.20383},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20383},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Influence of the Néel vector on the bulk electronic structure of MnTe measured from the (1 1̅ 00) surface
AU - D. A. Usanov
AU - A. B. Hellenes
AU - S. Hahn
AU - M. Leandersson
AU - J. Osiecki
AU - K. Uhlířová
AU - D. Evtushinsky
AU - L. Šmejkal
AU - T. Jungwirth
AU - J. H. Dil
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20383
UR - https://arxiv.org/abs/2610.20383
AB - 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 (11̅00) 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.
ER -