Chiral Splitting of Magnons and Paramagnon Coupling in MnTe

ORAL

Abstract

We investigate the intertwined dynamics of spin and lattice degrees of freedom in α-MnTe, focusing on the possible chiral splitting of magnon modes and their coupling to paramagnons, phonons, and polaronic excitations. The combination of strong spin-orbit interaction, noncentrosymmetric crystal symmetry, and magnetoelastic correlations in MnTe provides a fertile ground to explore such multichannel interactions. Through inelastic neutron scattering and complementary spinwave modeling, we examine how magnon–phonon hybridization evolves with temperature and how short-range spin correlations give rise to dispersive paramagnon modes that may couple to lattice fluctuations. We aim to establish a microscopic framework that captures the cooperative behavior of spin and lattice degrees of freedom underlying the complex excitation landscape of MnTe.

*This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract no. DE-AC05-00OR22725. Portions of this research used resources at the Spallation Neutron Source and High Flux Isotope Reactor, which is a U.S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Presenters

  • George Yumnam

    • Oak Ridge National Laboratory

Authors

  • George Yumnam

    • Oak Ridge National Laboratory
  • Eleanor M Clements

    • Oak Ridge National Laboratory
  • Jiaqiang Yan

    • Oak Ridge National Laboratory
  • Mathew B Stone

    • Oak Ridge National Laboratory
  • Michael E Manley

    • Oak Ridge National Laboratory
  • Raphael P Hermann

    • Oak Ridge National Laboratory