Magnons and skyrmions in fractional Hall ferromagnets

Details Magnons and skyrmions in fractional Hall ferromagnets Magnons and skyrmions in fractional Hall ferromagnets

1998-06-06

arxiv.org/abs/cond-mat/9806087v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, no figures

Scientific paper

10.1103/PhysRevB.58.R10171

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 $T$.

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