Instabilities of heavy magnons in an anisotropic magnet

Bai, Xiaojian; Zhang, Shang-Shun; Zhang, Hao; Dun, Zhiling; Phelan, W. Adam; Garlea, V. Ovidiu; Mourigal, Martin; Batista, Cristian D.

doi:10.1038/s41467-023-39940-1

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Title: Instabilities of heavy magnons in an anisotropic magnet

Journal Article · 13 July 2023 · Nature Communications

DOI: https://doi.org/10.1038/s41467-023-39940-1 · OSTI ID:1989771

; Zhang, Shang-Shun;

; Dun, Zhiling; Phelan, W. Adam;

;

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 FeI ₂ . 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 FeI ₂ is the quasi-flat nature of excitation bands and the presence of Kitaev anisotropic magnetic exchange interactions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725; SC0018660

OSTI ID:: 1989771

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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