Excitations in a quantum Hall ferromagnet with strong Coulomb interaction
Authors:
- 1 April 2002
- journal article
- Published by Pleiades Publishing Ltd in JETP Letters
- Vol. 75 (7) , 348-353
Abstract
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.Keywords
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