Ring-Exchange Interaction Effects on Magnons in Dirac Magnet CoTiO\(_3\)

The magnetic interactions that determine magnetic order and magnon energies typically involve only two spins. While rare, multi-spin interactions can also appear in quantum magnets and be the driving force in the ground state selection and in the nature of its excitations. By performing time-domain...

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Bibliographic Details
Published in:arXiv.org 2024-06
Main Authors: Li, Yufei, Mai, Thuc T, Karaki, M, Jasper, E V, Garrity, K F, Lyon, C, Shaw, D, DeLazzer, T, Biacchi, A J, Dally, R L, Heligman, D M, Gdanski, J, Adel, T, Muñoz, M F, Giovannone, A, Pawbake, A, Faugeras, C, Simpson, J R, Ross, K, Trivedi, N, Lu, Y M, Hight Walker, A R, R Valdés Aguilar
Format: Article
Language:English
Subjects:
Brillouin zones
Electron spin
Electrons
Exchanging
Excitation
Low temperature
Magnetism
Magnets
Magnons
Thin films
Topology
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Summary:The magnetic interactions that determine magnetic order and magnon energies typically involve only two spins. While rare, multi-spin interactions can also appear in quantum magnets and be the driving force in the ground state selection and in the nature of its excitations. By performing time-domain terahertz and magneto-Raman spectroscopy measurements combined with theoretical modeling, we determine the origin of the magnon excitation gap in Dirac antiferromagnet CoTiO\(_3\). By adding a ring-exchange interaction in a hexagonal plaquette of the honeycomb lattice to both an XXZ spin model and to a low energy spin-orbital flavor wave model, a gap is generated in the magnon spectrum at the Brillouin zone center. With this addition, the flavor wave model reproduces a large swath of experimental results including terahertz, Raman, inelastic neutron scattering, and magnetization experiments.
ISSN:2331-8422
DOI:10.48550/arxiv.2212.05278