Chiral magnon in ferromagnetic chiral crystals

TL;DR

This paper proposes the existence of chiral magnons in ferromagnetic chiral crystals, demonstrating their orbital angular momentum dependence on crystal chirality and the induction of orbital angular momentum via temperature gradients, akin to the Edelstein effect.

Contribution

It introduces the concept of chiral magnons in ferromagnetic chiral crystals and reveals their orbital angular momentum properties and control mechanisms.

Findings

Magnon orbital angular momentum reflects crystal chirality.

Temperature gradients can induce magnon orbital angular momentum.

Chiral magnons exhibit opposite signs for different chiralities.

Abstract

We theoretically propose chiral magnon in ferromagnetic chiral crystals. We show that the crystal chirality is imprinted in orbital angular momentum of magnons which exhibits the opposite signs for opposite chiralities of the crystal. We also show that a finite magnon orbital angular momentum can be induced by a temperature gradient which is a magnonic analogue of the Edelstein effect.