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MA: Fachverband Magnetismus
MA 54: Altermagnets VI
MA 54.6: Vortrag
Freitag, 13. März 2026, 10:45–11:00, HSZ/0002
Persistent altermagnetic spin polarisation — •Warlley H. Campos1, Florette C. F. Mbognou1, Anna B. Hellenes2,3, Jan Priessnitz1, and Libor Šmejkal1,3 — 1Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany — 3Institute of Physics, Czech Academy of Sciences, 162 00 Praha 6, Czech Republic.
Altermagnets exhibit d-, g-, or i-wave collinear spin polarisation of nonrelativistic exchange origin [1]. Relativistic spin-orbit coupling (SOC) is commonly considered to generate noncollinear spin textures in reciprocal space. Here, we demonstrate that collinear, persistent altermagnetic spin polarisation (PASP) in the full Brillouin zone is possible even in the presence of strong SOC. By combining spin and magnetic layer group analysis, we identify two distinct classes of PASP: one materialising on top of strong exchange spin splitting, and the other accompanying a typically weaker [2], relativistic spin splitting. We then perform ab initio calculations to realise the strong and weak types in Lieb-lattice [3-5] and cuprate altermagnets [1], respectively. Finally, we discuss experimental indication of weak PASP in MnTe [2]. PASP could enable strong spintronics currents with long spin lifetimes and efficient spin accumulation [5].
[1] L. Šmejkal et al., Phys. Rev. X 12, 031042 (2022). [2] Krempasky et al., Nature (2024); A. Dal Din et al., arXiv:2511.01690. [3] R. Jaeschke-Ubiergo et al., arXiv:2503.10797. [4] N. Parthenios et al., arXiv:2502.19270. [5] L.E. Golub et al., arXiv:2503.12203.
Keywords: altermagnetism; persistent spin texture; unconventional magnetism; spin-orbit coupling; spin polarisation