Magnons and skyrmions in fractional Hall ferromagnets

Abstract

Recent experiments have established a qualitative difference between the magnetization temperature-dependences $M(T)$ of quantum Hall ferromagnets at integer and fractional filling factors. We explain this difference in terms of the relative energies of collective magnon and particle-hole excitations in the two cases. Analytic calculations for hard-core model systems are used to demonstrate that, in the fractional case, interactions suppress the magnetization at finite temperatures and that particle-hole excitations rather than long-wavelength magnons control $M(T)$ at low $T$.

4 pages, no figures

References in corpus (4)

• Fractional Quantum Hall Effect Measurements at Zero g-Factor
• Optically Pumped NMR Measurements of the Electron Spin Polarization in GaAs Quantum Wells near Landau Level Filling Factor nu=1/3
• Quantum Hall Fluids on the Haldane Sphere: A Diffusion Monte Carlo Study
• Unpolarized quasielectrons and the spin polarization at filling fractions between 1/3 and 2/5

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• Transport gap in a nu=1/3 quantum Hall system: a probe for skyrmions
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• Microscopic study of the 2/5 fractional quantum Hall edge
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• Finite Temperature Magnetism in Fractional Quantum Hall Systems: Composite Fermion Hartree-Fock and Beyond