Instabilities of heavy magnons in an anisotropic magnet.
Nat Commun
; 14(1): 4199, 2023 Jul 14.
Article
em En
| MEDLINE
| ID: mdl-37452016
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.
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Base de dados:
MEDLINE
Assunto principal:
Campos Magnéticos
/
Imãs
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article