Magnons in the antiferromagnetic insulator CoTiO₃

Dirac materials have been extensively studied in fermionic particle system like graphene and topological insulators. Recently, bosonic Dirac magnons have been reported in the antiferromagnetic insulator CoTiO₃, where the magnetic lattice of the Co²⁺ ions is a stacked honeycomb lattice analogous to graphene lattice. Here we report Raman spectra of multiple magnon modes below the transition temperature, which is consistent with the recent inelastic neutron scattering experiments [1, 2]. We will also discuss magnetic-field and temperature dependence of magnons in this antiferromagnetic insulator.

[1] B. Yuan, et al. Phys. Rev. X 10, 011062 (2020)

[2] M. Elliot, et al. Nat. Comm. 12, 3936 (2021)