Cavity optomechanics of topological spin textures in magnetic insulators

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. arXiv:1809.10091v2 [cond-mat.mes-hall]

Interferometric control of magnon-induced nearly perfect absorption in cavity magnonics

“…This interference is tunable by both the strength and the direction of an external magnetic field, and can modify magnetically induced transparency (MIT) into a level attraction (LA)-like hybridization in the transmission. Different from previously reported systems with dissipative coupling [35][36][37][38][39][40][41][42][43][44][45][46] , negative mass 47 , or negative energy [48][49][50][51][52][53] , LA-like hybridization in our device is a special transmission response produced by destructive interference. This hybridization eliminates transmission and allows perfect absorption (96% in the experiment and 100% in the theory reported in this work).…”

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

“…Alternatively, Grigoryan and Xia have proposed an approach to explore level attraction [28] in hybrid magnon-photon systems, by modulating the relative phase [29] between coherent microwaves, and very recently Boventer et al [30] reported level attraction in these systems. Due to its potential applications in topological energy transfer, quantum sensing, and nonreciprocal photon transmission, level attraction has been of great interest in studies of other systems, such as in Bose-Einstein condensated quantum systems [31,32], microcavity polariton systems [33] and cavity optomechanical systems [34][35][36].…”

Prediction of Attractive Level Crossing via a Dissipative Mode

“…For example, either the oscillator or the dissipative third-party can be superconducting qubit [6,23], dielectric nanostructures [24], antiferromagnets [25,26], high-order spin wave modes [27] or other excitations such as phonons [28]. It has been reported recently that magnetic textures can also be coupled with the cavity photons [29,30]. Based on the understanding of dissipative coupling, the nonlinear effect [31,32] and topological properties of exceptional point [33][34][35][36] can be generalized and new physics is expected.…”