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MA: Fachverband Magnetismus

MA 2: Altermagnets I

MA 2.10: Vortrag

Montag, 9. März 2026, 12:00–12:15, HSZ/0004

Magnetic circular dichroism in resonant Auger electron diffraction from altermagnets — •Peter Krüger — Chiba University, Chiba, Japan

Recently we demonstrated that in altermagnets, there exists a large magnetic circular dichroism (MCD) in resonant photoelectron diffraction (RPED) [1]. The MCD-RPED signal is time-reversal odd and characteristic of the altermagnetic state. It is proportional to the local XMCD signal from a single magnetic sublattice and thus provides a direct probe of the sublattice magnetization. Here we show that MCD-RPED occurs in all altermagnets independently of the orientation of the Néel vector. This is a major difference to the weak XMCD observed in some altermagnets [2]. We also extend the theory to resonant Auger electron diffraction, whose MCD gives similar information as that of RPED, while being conceptually simpler. We discuss the symmetry properties of the MCD signal and explain its physical origin with a simple model. [1] P. Krüger, Phys. Rev. Lett. 135, 196703 (2025). [2] A. Hariki et al, Phys. Rev. Lett. 132, 176701 (2024).

Keywords: altermagnetism; photoelectron diffraction; circular dichroism; Auger; theory