Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 8: Altermagnets II
MA 8.1: Talk
Monday, March 9, 2026, 15:00–15:15, HSZ/0002
Odd-parity spin splitting and anomalous Hall effect in spiral magnets — •Shun Okumura1,2, Moritz M. Hirschmann2, and Yukitoshi Motome3 — 1Quantum-Phase Electronics Center, The University of Tokyo, Tokyo, Japan — 2RIKEN Center for Emergent Matter Science, Wako, Japan — 3Department of Applied Physics, The University of Tokyo, Tokyo, Japan
Altermagnetism with collinear antiferromagnetic order has recently attracted considerable interest for a spontaneous anomalous Hall effect (AHE) mediated by spin-orbit coupling (SOC). In contrast, non-coplanar magnetic textures such as skyrmions exhibit a topological Hall effect by imprinting a Berry phase on itinerant electrons even in the absence of SOC. However, in the case of spiral magnetism, a prototypical example of a non-collinear and coplanar magnetic structure, the conditions required to realize AHE have yet to be thoroughly explored.
In this study, we investigate the AHE in metallic systems coupled to commensurate spiral magnetic textures. The electronic bands exhibit odd-parity spin splitting with spin polarization perpendicular to the helical plane. In the presence of SOC and finite magnetization, the Berry curvature concentrated along the spin-nodal lines leads to a characteristic AHE in the spin spiral state. This spiral-induced AHE depends sensitively on the SOC type, helical plane, and magnetization direction. We also demonstrate that a “p-wave” magnet with a commensurate spin spiral, recently identified in an f-electron material, can host this enormous AHE.
Keywords: spin spiral; helimagnet; odd-parity spin splitting; anomalous Hall effect; p-wave magnet