Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 9: Altermagnets I
MA 9.6: Vortrag
Montag, 17. März 2025, 16:15–16:30, H20
Chiral spin-flip magnons in metallic altermagnets from many-body perturbation theory — •Wejdan Beida1, Ersoy Sasioglu2, Gustav Bihlmayer1, Christoph Friedrich1, Yuiry Mokrousov1, Ingrid Mertig2, and Stefan Blügel1 — 1Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich Germany — 2Institute of Physics, Martin Luther University Halle-Wittenberg, 06120 Halle, Germany
Altermagnets represent a novel class of magnetic materials that bridge the gap between conventional ferro- and antiferromagnets. A unique feature of altermagnets is the lifting of degeneracy of their spin-wave modes (magnons) along the same crystallographic directions in which electronic bands also exhibit spin splitting. This non-degeneracy leads to chirality and directional anisotropy in spin-wave dispersions. In this presentation, we present the spin splitting of electronic bands and chiral spin-wave excitations in a series of metallic altermagnets, which have NiAs-type crystal structure, using DFT and many-body perturbation theory [1]. Our findings reveal a pronounced anisotropic splitting in chiral magnon bands, a small chiral asymmetry in the magnon lifetime, and demonstrate that magnon damping due to Stoner excitations is minimal. This results in long-lived magnons with efficient propagation, underscoring the potential of altermagnets for advanced spintronic and magnonic applications.
W.B. acknowledges support by the Palestinian-German Science Bridge.
[1] E. Sasioglu et al., Phys. Rev. B 81,054434 (2010).
Keywords: Altermagnet; Magnons; chiral; Many-body perturbation theory; Stoner