Nonequilibrium charge density wave ordering from anomalous velocity in itinerant helical magnets

Details Nonequilibrium charge density wave ordering from anomalous velocity in itinerant helical magnets Nonequilibrium charge density wave ordering from anomalous velocity in itinerant helical magnets

2005-06-13

arxiv.org/abs/cond-mat/0506298v1

Sol. St. Comm. 135, 62 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages and 1 figure

Scientific paper

10.1016/j.ssc.2005.03.059

The Karplus-Luttinger anomalous velocity is shown to lead to electric-field-induced charge accumulation in nearly ferromagnetic noncollinear magnets with itinerant electrons, like $MnSi$. For helical magnetic ordering, the balance between this accumulation and the Coulomb interaction leads to a nonequilibrium charge density wave state with the period of the helix, even when such accumulation is forbidden by an approximate gauge-like symmetry in the absence of electric field. We compute the strength of such charge accumulation as an example of how unexpected many-electron physics is induced by the inclusion of the one-electron Karplus-Luttinger term whenever the local exchange field felt by conduction electrons does not satisfy the current-free Maxwell equations.

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