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Chiral electronic excitations and strong electron-phonon coupling to Weyl fermions in the kagome semimetal Co3Sn2S2

Ge He1,2,3,*,†, Malhar Kute4,5,*, Zhongchen Xu6,7, Leander Peis2,8,9,‡, Ramona Stumberger2,8,§, Andreas Baum2,8,∥, Daniel Jost2,5,8, Emily Been5,10,11, Brian Moritz5 et al.

Jun Shen1, Youguo Shi6,12,¶, Thomas P. Devereaux4,5,13,**, and Rudi Hackl2,8,9,††

  • *These authors contributed equally to the work.
  • †Contact author: ge.he@bit.edu.cn
  • ‡Present address: Capgemini, Frankfurter Ring 81, 80807 München, Germany.
  • §Present address: Robert Bosch GmbH, Robert-Bosch-Campus 1, 71272 Renningen, Germany.
  • ∥Present address: Mynaric, Bertha-Kipfrnüller-Str. 2-4, 81249 München, Germany.
  • Contact author: ygshi@iphy.ac.cn
  • **Contact author: tpd@stanford.edu
  • ††Contact author: hackl@tum.de

Phys. Rev. B 112, 214404 – Published 1 December, 2025

DOI: https://doi.org/10.1103/wkzr-vfgn

Abstract

We present results of a Raman-scattering study of the Kagome ferromagnet Co3Sn2S2, with a focus on electronic and phononic excitations and their interplay. We provide a theoretical analysis of the electronic-band structure, enabling a semiquantitative explanation of the spectra. A prominent feature in the electronic spectra is a redistribution of spectral weight from low to high energies in all polarization configurations starting at the Curie temperature TC. In the symmetry-resolved spectra, the suppression of the A1g continuum in the ferromagnetic state arises from the redistribution of electronic states below TC, while a strong enhancement of the A2g continuum is linked to the dynamics of fermions near the Fermi level EF being characterized by spin-momentum locking near Weyl points. The A1g phonon modulates the position of these Weyl points and couples strongly to the related fermions close to EF. These results allow a comprehensive understanding of the bulk band-structure evolution as a function of temperature in Co3Sn2S2, offering key insights for further studies of the driving force behind the long-range magnetic order and novel topological states in this compound.

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