Hidden Galilean symmetry, conservation laws and emergence of spin current in the soliton sector of chiral helimagnet
arXiv:0810.2583 · doi:10.1016/j.physleta.2008.12.010
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.
arXiv comment14 pages
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Cited by in corpus (4)
- Coherent sliding dynamics and spin motive force driven by crossed magnetic fields in chiral helimagnet
- Origin of adiabatic and non-adiabatic spin transfer torques in current-driven magnetic domain wall motion
- Spin parity effects in monoaxial chiral ferromagnetic chain
- Spin-current diode with a monoaxial chiral magnet