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MA: Fachverband Magnetismus

MA 54: Altermagnets VI

MA 54.5: Vortrag

Freitag, 13. März 2026, 10:30–10:45, HSZ/0002

Quantum Entanglement Signatures of Altermagnetism — •mahsa seyed heydari, wolfgang belzig, and sebastián a. díaz — Universität Konstanz

In two-sublattice magnets in an antiferromagnetic configuration, the notion of two-mode squeezing is equivalent to quantum entanglement between the sublattice spins[1]. It has been shown that the logarithmic negativity is linearily related to the squeezing parameter. Altermagnets are a particular class of magnets which have a vanishing total magnetisation but a peculiar spin-polarization texture in momentum space. Using a simple model an altermagnet [2], we determine the magnon spectrum of an altermagnet and show that particular entanglement features witness the altermagnetic nature. Hence, we show that quantum magnonics offers a route towards distinguishing altermagnets from simple antiferromagnets, which is a difficult experimental task to date.

[1] Kamra, A.; Belzig, W. Phys. Rev. Lett. 2016, 116, 146601.

[2] Brekke, B.; Brataas, A.; Sudbø, A. Phys. Rev. B 2023, 108, 224421.

Keywords: Altermagnetism; Logarithmic negativity; Magnon Squeezing