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MA: Fachverband Magnetismus

MA 54: Altermagnets VI

MA 54.4: Vortrag

Freitag, 13. März 2026, 10:15–10:30, HSZ/0002

Antichiral surface states in altermagnets — •Sopheak Sorn — Institute for quantum materials and technology, Karlsruhe Institute of Technology, Karlsruhe, Germany — Institute of theoretical solid state physics, Karlsruhe Institute of Technology, Karlsruhe, Germany

Altermagnets host symmetry-protected nodal lines and nodal planes in their band structures. In this talk, I will show how nodal lines in d-wave altermagnets give rise to unusual surface states that are antichiral. Antichiral surface states on two opposite surfaces of a slab geometry propagate parallel to one another, in contrast to the antiparallel propagation direction of chiral surface states. I demonstrate the presence of antichiral surface states using a tight-binding model. The antichiral character and many important features of the antichiral surface states are explained using a mapping from the altermagnetic model to Su-Schrieffer-Heeger chains: the topological index and the bulk-boundary correspondence of the latter explain the antichiral surface states. This work indicates that altermagnets are one of the few quantum materials that can support such antichiral surface states.

Reference [1] Sopheak Sorn, Antichiral surface states and Su-Schrieffer-Heeger physics in rutile altermagnets, Phys. Rev. B 111, L161109 (2025).

Keywords: altermagnet; surface states; antichiral; Su-Schrieffer-Heeger chain; nodal lines