Altermagnetic lifting of Kramers spin degeneracy

Krempaský, Juraj; Šmejkal, Libor; D’Souza, S. W.; Hajlaoui, Mahdi; Springholz, G.; Uhlířová, Klára; Alarab, Fatima; Constantinou, Procopios; Strocov, Vladimir N.; Усанов, Д. А.; Pudelko, W. R.; González‐Hernández, Rafael; Hellenes, Anna Birk; Jansa, Zdeňek; Reichlová, Helena; Šobáň, Z.; Betancourt, R. D. Gonzalez; Wadley, P.; Sinova, Jairo; Kriegner, Dominik; Minář, J.; Dil, J. Hugo; Jungwirth, T.

doi:10.1038/s41586-023-06907-7

articleNatureFeb 14, 2024HYBRID OA

Altermagnetic lifting of Kramers spin degeneracy

JKJuraj Krempaský LŠLibor Šmejkal SWS. W. D’Souza MHMahdi Hajlaoui GSG. Springholz

Paul Scherrer Institute · Johannes Gutenberg University Mainz · +9 more institutions

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Abstract

Abstract Lifted Kramers spin degeneracy (LKSD) has been among the central topics of condensed-matter physics since the dawn of the band theory of solids 1,2 . It underpins established practical applications as well as current frontier research, ranging from magnetic-memory technology 3–7 to topological quantum matter 8–14 . Traditionally, LKSD has been considered to originate from two possible internal symmetry-breaking mechanisms. The first refers to time-reversal symmetry breaking by magnetization of ferromagnets and tends to be strong because of the non-relativistic exchange origin 15 . The second applies to crystals with broken inversion symmetry and tends to be comparatively weaker, as it originates from…

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Keywords

Physics
Magnetism
Condensed matter physics
Point reflection
Symmetry breaking
Magnetization
Ferromagnetism
Symmetry (geometry)

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