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MA: Fachverband Magnetismus
MA 2: Altermagnets I
MA 2.5: Vortrag
Montag, 9. März 2026, 10:30–10:45, HSZ/0004
Magnons in Antialtermagnets — •Robin R. Neumann1,2,3, Rodrigo Jaeschke-Ubiergo2, Ricardo Zarzuela2, Jairo Sinova2,4, and Alexander Mook1,2 — 1University of Münster, Münster, Germany — 2Johannes Gutenberg University Mainz, Mainz, Germany — 3Martin Luther University Halle-Wittenberg, Halle, Germany — 4Texas A&M University, College Station, USA
Altermagnets and antialtermagnets are unconventional magnetic phases with compensated magnetization and nonrelativistic spin splitting in their electronic band structures. In altermagnets, this spin splitting has even parity, whereas in antialtermagnets it has odd parity. In this talk we go beyond electrons and demonstrate that magnons, the collective spin excitations of magnetically long-range ordered systems, inherently feature an odd-parity spin polarization in antialtermagnets without spin-orbit or dipolar coupling. We present minimal model spin Hamiltonians free of spin-orbit coupling that stabilize antialtermagnetic ground states, discuss their symmetries, and characterize the spin-polarized magnon band structures.
Keywords: Magnons; Antialtermagnetism; Odd-Parity Magnetism; Unconventional Magnetism; Noncollinear Magnetism