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TT: Fachverband Tiefe Temperaturen

TT 98: Altermagnets

TT 98.7: Vortrag

Freitag, 13. März 2026, 11:15–11:30, CHE/0091

Nonlinear Sigma Model of an Insulating Altermagnet — •Parasar Thulasiram^1,2, Chris Hooley³, and Roderich Moessner¹ — ¹Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ²Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ³Centre for Fluid and Complex Systems, Coventry University, Coventry, United Kingdom

We applied the Haldane map to derive an O(3) x O(3) nonlinear sigma model of an insulating altermagnet from a transition-metal-dichalcogenide-inspired 3D spin model. The model displays nonrelativistic spin splitting of the magnon bands and anisotropic couplings. We studied the energetics of its preferred topological defects (skyrmions and hopfions), their viability in being generated, as well as the model's behaviour under lightly frustrated couplings. We performed a renormalization analysis of the model and studied its (in)stabilities.

Keywords: Altermagnets; Nonlinear Sigma Model; Unconventional Magnetism; Field Theory; Topological Defects