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MA: Fachverband Magnetismus

MA 13: Altermagnets II

MA 13.2: Vortrag

Dienstag, 18. März 2025, 09:45–10:00, H20

Theory of circular dichroism in resonant photoelectron diffraction of altermagnets — •Peter Krüger — Materials Science Dpt, Chiba University, Chiba 263-8522 Japan

Recently we have developed a computational method for resonant photoelectron diffraction (RPED) and its circular dichroism (CD) of magnetic surfaces, by combining ligand field multiplet and multiple scattering theory. The method was successfully tested for ferromagnetic Ni(111) [Phys. Rev. B 107, 075407 (2023)]. Here I apply the new method to the altermagnet MnTe. For a photon energy at the Mn L3-edge resonance and light incidence parallel to the magnetization axis, I show that there is a large, purely magnetic CD signal at the forward focusing peaks of the RPED pattern. This CD signal provides a direct probe of the staggered magnetization in altermagnets, which is closely related to the X-ray magnetic circular dichroism observed in ferromagnets.

Keywords: resonant photoemission; photoelectron diffraction; XMCD; multiplet; multiple scattering