Dresden 2026 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 54: Altermagnets VI

MA 54.2: Talk

Friday, March 13, 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