Hidden Galilean symmetry, conservation laws and emergence of spin current in the soliton sector of chiral helimagnet

TL;DR

This paper reveals hidden Galilean invariance in chiral helimagnets, deriving conservation laws and explaining the emergence of spin current through symmetry analysis of the continuum model.

Contribution

It applies Lie group analysis to the chiral XY model, uncovering hidden symmetries and conservation laws that justify spin current existence.

Findings

Identification of hidden Galilean invariance in the model

Derivation of energy and momentum conservation laws

Explanation of spin current emergence due to symmetry breaking

Abstract

Motivated by the spin current problem in chiral helimagnet, we rigorously elucidated the hidden Galilean invariance in the chiral XY model under the magnetic field. The Lie group analysis is applied to the differential equations of the continuum theory of the chiral helimagnet with the parity-violating Dzyaloshinskii-Morya coupling under a transversal magnetic field. Lie point symmetries and the invariant solutions under these symmetries are found. They present sliding solutions that come up as a consequence of breaking of both spin rotational symmetry by the external magnetic field and a parity violation due to the Dzyaloshinskii-Morya interaction. We found that variational symmetries are related with translations in space and time, the corresponding energy and momentum conservation laws are derived. We therefore succeeded in justifying the existence of the transport spin current in chiral helimagnet.