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VOLUME 75 (2002) | ISSUE 7 | PAGE 419
Excitations in quantum hall ferromagnet with strong Coulomb interaction
PACS: 71.27.+a, 73.43.-f
Abstract
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 magnetoplasmon exciton and gapeless spin exciton. All charged excitations have a gap. The activation energy gap for a pair of charged topological excitations - skyrmion and antiskyrmion - is small Δ = νωH. Electric charge of skyrmion is multiple q=eν Q, where Q is the integer topological charge.