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Quantum Geometry of Altermagnetic Magnons Probed by Light

Rundong Yuan1,*, Wojciech J. Jankowski1,†, Ka Shen2,3, and Robert-Jan Slager4,1,‡

  • 1TCM Group, Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
  • 2The Center for Advanced Quantum Studies, School of Physics and Astronomy, and Institute for Advanced Study, Beijing Normal University, Beijing 100875, China
  • 3Key Laboratory of Multiscale Spin Physics, Ministry of Education, Beijing Normal University, Beijing 100875, China
  • 4Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom

  • *Contact author: ry306@cam.ac.uk
  • †Contact author: wjj25@cam.ac.uk
  • ‡Contact author: rjs269@cam.ac.uk
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Phys. Rev. Lett. 137, 106901 – Published 1 September, 2026

DOI: https://doi.org/10.1103/12cl-b9jj

Abstract

Magnons with momentum-dependent chirality are a key signature of altermagnets. We identify bicircular light as a smoking-gun optical probe for chiral altermagnetic magnons, selectively targeting their quantum geometry induced by an alternation of magnonic chirality. We show that in d-wave altermagnets, under a canting magnetic field, the altermagnetic magnons realize a nontrivial quantum geometry, resulting in an enhancement of the nonlinear second-order light-magnon interactions. We find that the scattering of bicircular pulses probes the present magnonic quantum geometry, even if the magnonic topology is trivial. Hence, our findings establish bicircular Raman response as an optical effect of choice to identify altermagnetic magnons. As such, we propose a universal experimental protocol to distinguish altermagnets from antiferromagnets by detecting their magnon chirality patterns with light, independently of the underlying magnon topology.

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Phys. Rev. Lett. 137, 106901– Published 1 September, 2026
  • Received 6 August 2025
  • Accepted 5 August 2026
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