Hybrid Goldstone modes in multiferroics

TL;DR

This paper demonstrates that in multiferroics, hybrid excitations involving both spin and lattice degrees of freedom, termed Goldstone modes, arise due to spin-lattice entanglement and Dzyaloshinskii-Moriya interactions, as shown by neutron scattering.

Contribution

It introduces the concept of hybrid Goldstone modes in multiferroics and links their origin to Dzyaloshinskii-Moriya interactions, supported by neutron scattering data.

Findings

Identification of hybrid spin-lattice excitations as Goldstone modes

Evidence of spin-lattice quantum entanglement in multiferroics

Dzyaloshinskii-Moriya interaction as a key mechanism

Abstract

By using polarized inelastic neutron scattering measurements, we show that the spin-lattice quantum entanglement in mutliferroics results in hybrid elementary excitations, involving spin and lattice degrees of freedom. These excitations can be considered as multiferroic Godstone modes. We argue that the Dzyaloshinskii-Moriya interaction could be at the origin of this hybridization.