Cavity Optomechanics of Topological Spin Textures in Magnetic Insulators

TL;DR

This paper explores how topological magnetic textures in insulators interact with cavity photons via optomechanical effects, revealing tunable level attraction phenomena influenced by magnetic chirality and external fields.

Contribution

It introduces a novel cavity optomechanics framework for topological spin textures, demonstrating their interaction with light and revealing tunable level attraction regimes.

Findings

Effective optomechanical coupling parameters estimated for spin textures.

Chiral magnetic soliton lattice exhibits light-helicity-dependent behavior.

Level attraction regime observed and tunable via magnetic field.

Abstract

Collective dynamics of topological magnetic textures can be thought of as a massive particle moving in a magnetic pinning potential. We demonstrate that inside a cavity resonator this effective mechanical system can feel the electromagnetic radiation pressure from cavity photons through the magneto-optical inverse Faraday and Cotton-Mouton effects. We estimate values for the effective parameters of the optomechanical coupling for two spin textures -- a Bloch domain wall and a chiral magnetic soliton lattice. The soliton lattice has magnetic chirality, so that in circularly polarized light it behaves like a chiral particle with the sign of the optomechanical coupling determined by the helicity of the light and chirality of the lattice. Most interestingly, we find a level attraction regime for the soliton lattice, which is tunable through an applied magnetic field.