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Instabilities of heavy magnons in an anisotropic magnet

Author

Listed:
  • Xiaojian Bai

    (Oak Ridge National Laboratory
    Georgia Institute of Technology
    Louisiana State University)

  • Shang-Shun Zhang

    (University of Tennessee)

  • Hao Zhang

    (University of Tennessee
    Oak Ridge National Laboratory)

  • Zhiling Dun

    (Georgia Institute of Technology)

  • W. Adam Phelan

    (The Johns Hopkins University)

  • V. Ovidiu Garlea

    (Oak Ridge National Laboratory)

  • Martin Mourigal

    (Georgia Institute of Technology)

  • Cristian D. Batista

    (University of Tennessee
    Oak Ridge National Laboratory)

Abstract

The search for new elementary particles is one of the most basic pursuits in physics, spanning from subatomic physics to quantum materials. Magnons are the ubiquitous elementary quasiparticle to describe the excitations of fully-ordered magnetic systems. But other possibilities exist, including fractional and multipolar excitations. Here, we demonstrate that strong quantum interactions exist between three flavors of elementary quasiparticles in the uniaxial spin-one magnet FeI2. Using neutron scattering in an applied magnetic field, we observe spontaneous decay between conventional and heavy magnons and the recombination of these quasiparticles into a super-heavy bound-state. Akin to other contemporary problems in quantum materials, the microscopic origin for unusual physics in FeI2 is the quasi-flat nature of excitation bands and the presence of Kitaev anisotropic magnetic exchange interactions.

Suggested Citation

  • Xiaojian Bai & Shang-Shun Zhang & Hao Zhang & Zhiling Dun & W. Adam Phelan & V. Ovidiu Garlea & Martin Mourigal & Cristian D. Batista, 2023. "Instabilities of heavy magnons in an anisotropic magnet," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39940-1
    DOI: 10.1038/s41467-023-39940-1
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    References listed on IDEAS

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