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MA: Fachverband Magnetismus

MA 13: Altermagnets II

MA 13.12: Vortrag

Dienstag, 18. März 2025, 12:30–12:45, H20

SU(N) altermagnetism: Lattice models, magnon modes, and flavor-split bands — •Pedro Monteiro Cônsoli and Matthias Vojta — Institut für Theoretische Physik, TU Dresden

Altermagnets are magnetically ordered states which, much like antiferromagnets, have zero net magnetization, and yet resemble ferromagnets in that their band structure shows signs of broken time-reversal symmetry. They have stirred great interest lately not only due to their potential for spintronics applications, but also as gateways to unconventional phases of matter. In this talk, we will demonstrate that a generalized form of altermagnetism can occur in SU(N) magnets with N>2. Guided by symmetry principles, we will present a recipe to construct simple Heisenberg models for such generalized altermagnets and apply it explicitly to two-dimensional examples with N=2 and 3. We will then report a comparative analysis based on spin- and flavor-wave calculations which proves that both systems share the same characteristic behavior of insulating altermagnets, namely that their magnon bands are nondegenerate and carry different sets of magnetic quantum numbers. Finally, we will show that the analogy between the models persists when they are supplemented with charge carriers to become metallic.

Keywords: Altermagnetism; SU(N) magnetism