Spin-Pseudospin Coherence and CP3 Skyrmions in Bilayer Quantum Hall Ferromagnets
Z. F. Ezawa
Abstract
We analyze bilayer quantum Hall ferromagnets, whose underlying symmetry group is SU(4). Spin-pseudospin coherence develops spontaneously when the total electron density is low enough. Quasiparticles are CP3 skyrmions. One skyrmion induces charge modulations on both of the two layers. At the filling factorν=2/m one elementary excitation consists of a pair of skyrmions and its charge is 2e/m. Recent experimental data due to Sawada et al. [Phys. Rev. Lett. 80, 4534 (1998)] support this conclusion.
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