Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-10-15
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages
Scientific paper
10.1016/j.physleta.2008.12.010
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.
Bostrem I. G.
Kishine Jun-ichiro
Lavrov R. V.
Ovchinnikov A. S.
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