Strong Coupling between Propagating Magnons and High-order Gyrotropic Skyrmion Modes

TL;DR

This paper demonstrates coherent strong coupling between propagating magnons and local skyrmion resonances via exchange interaction, revealing tunable polaragnonic band gaps and paving the way for quantum magnonic applications.

Contribution

It reports the first realization of strong magnon-skyrmion mode coupling through exchange interaction, including the observation of polaragnonic band gaps and control over coupling regimes.

Findings

Observation of magnonic polaragnonic band gap (PBG).

Detection of Rabbi coupling gap (RCG) in dispersion.

Strong coupling regime achieved by tuning magnon wavenumber.

Abstract

Inspired by the recent achievements of the strong magnons- and spin textures-photons coupling via dipolar interaction, the coupling between magnons and the local resonances of spin textures through direct exchange interaction is expected but not realized yet. In this work, we demonstrated the coherent coupling between propagating magnons and local skyrmion resonances. Besides the Rabbi coupling gap (RCG) in the frequency field dispersion, a magnonic analog of polariton gap, polaragnonic band gap (PBG), is also observed in the frequency-wavenumber dispersion. The realization of coupling requires the gyrotropic skyrmion modes to satisfy not only their quantum number larger than one but also their chirality opposite to that of magnons. The observed PBG and RCG can be controlled to exist within different Brillouin zones (BZs) as well as at BZ boundaries. The coupling strength can approach the strong regime by selecting the wavenumber of propagating magnons. Our findings could provide a pure magnonic platform for investigating quantum optics phenomena in quantum information technology.