Ring-Exchange Interaction Effects on Magnons in Dirac Magnet CoTiO_3
arxiv(2022)
摘要
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.
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