Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 54: Altermagnets VI
MA 54.2: Vortrag
Freitag, 13. März 2026, 09:45–10:00, HSZ/0002
Giant Faraday Effect of magnon-polarons in the magnetoelectric altermagnet Fe2Mo3O8 — •Kirill Vasin1, Sandor Bordács2, Lilian Prodan1, Vladimir Tsurkan3, Istvan Kézsmárki1, and Joachim Deisenhofer1 — 1University of Augsburg, Augsburg, Germany — 2Budapest University of Technology and Economics, Budapest, Hungary — 3Moldova State University, Chisinau, Republic of Moldova
We investigate magnetic circular dichroism of magnon-polarons in the polar altermagnet candidate Fe2Mo3O8 using time-domain terahertz magnetospectroscopy. From linearly polarized measurements in Faraday geometry we reconstruct right- and left-circular transmission, revealing hybrid magnon-phonon branches which are fully circularly polarized below the Néel temperature. These magnon-polarons are both electric- and magnetic-dipole active and produce exceptionally large Faraday rotations in the terahertz range, with Verdet constant up to ∼ 4100∘/T/cm. A suggested minimal circular-birefringent dielectric model captures both the magnitude and field dependence of the response.
Keywords: faraday; magnons; magnetooptics; tds-thz