Excitations in a quantum Hall ferromagnet with strong Coulomb interaction

  • S. V. Iordanski
  • A. Kasbuba
Condensed Matter


A quantum Hall ferromagnet is considered at integer fillings ν, provided typical Coulomb interaction energy Ec is large compared to the cyclotron energy ωH. Low-energy collective modes consist of a magnetoplasmon exciton and a gapless spin exciton. All charged excitations have a gap. The activation energy gap for a pair of charged topological excitations—skyrmion and antiskyrmion—is small, i.e., Δ< vωH. The electric charge of a skyrmion is the multiple q=eνQ, where Q is the integer topological charge.

PACS numbers

71.27.+a 73.43.Cd 71.35.Lk 


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Copyright information

© MAIK "Nauka/Interperiodica" 2002

Authors and Affiliations

  • S. V. Iordanski
    • 1
  • A. Kasbuba
    • 1
  1. 1.Landau Institute for Theoretical PhysicsRussian Academy of SciencesMoscowRussia

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