Two-magnon Raman scattering in antiferromagnetic phases of frustrated spin models on the honeycomb lattice

TL;DR

This paper calculates two-magnon Raman spectra in frustrated antiferromagnetic models on the honeycomb lattice, revealing how frustration and anisotropy influence the spectra and aiding in extracting magnetic interactions from experimental data.

Contribution

It provides the first detailed analysis of two-magnon Raman scattering in various frustrated honeycomb lattice models, linking theoretical spectra to experimental observations.

Findings

Magnetic frustration and anisotropy significantly alter Raman spectra.

Raman spectra can be used to infer magnetic interactions in materials.

Results applicable to iron-based compound BaFe$_2$Se$_2$O.

Abstract

We calculate the two-magnon Raman scattering spectra in antiferromagnetic phases of several frustrated spin models defined on the honeycomb lattice. These include the N\'{e}el antiferromagnetic phase of a $J_1$-$J_2$-$J_3$ model and the stripe phase of the Heisenberg-Kitaev model. We show that both the magnetic frustration and the anisotropy of interactions may significantly affect the Raman spectra. We further discuss the implications of our results to the magnetic excitations of the iron-based compound BaFe$_2$Se$_2$O and show how the magnetic interactions can be extracted from fit to the Raman spectrum.