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

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
135
Identifiers
DOI: 10.1016/j.ssc.2005.03.059
Keywords
  • D. Anomalous Hall Effect
  • D. Charge Density Wave
Disciplines
  • Physics

Abstract

Abstract 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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