Chiral Phonon Transport Induced by Topological Magnons

TL;DR

This paper predicts the existence of chiral edge phonon modes induced by topological magnons in 2D ferromagnetic systems, offering new insights into heat management and phonon transport in topological materials.

Contribution

It introduces the concept of chiral phonon transport mediated by topological magnons and demonstrates the existence of topological magneto-polarons and chiral edge phonons in such systems.

Findings

Topological magneto-polarons around phonon-magnon crossings.

Existence of Rayleigh edge phonons in armchair ribbons.

Chiral edge modes with phononic character mediating heat transport.

Abstract

The plethora of recent discoveries in the field of topological electronic insulators has inspired a search for boson systems with similar properties. There are predictions that ferromagnets on a two-dimensional honeycomb lattice may host chiral edge magnons. In such systems, we theoretically study how magnons and phonons couple. We find topological magneto-polarons around the avoided crossings between phonons and topological magnons. Exploiting this feature along with our finding of Rayleigh edge phonons in armchair ribbons, we demonstrate the existence of chiral edge modes with a phononic character. We predict that these modes mediate a chirality in the coherent phonon response and suggest to measure this effect via elastic transducers. These findings reveal a possible approach towards heat management in future devices.