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Disorder and interactions in quantum Hall ferromagnets: effects of disorder in Skyrmion physics

Jairo Sinova·A. H. MacDonald·S. M. Girvin
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Abstract

We present a Hartree-Fock study of the competition between disorder and interactions in quantum Hall ferromagnets near $ν=1$. We find that the ground state at $ν=1$ evolves with increasing interaction strength from a quasi-metallic paramagnet, to a partially spin-polarized ferromagnetic Anderson insulator, and to a fully spin-polarized ferromagnet with a charge gap. Away from $ν=1$, the ground state evolves from a conventional Anderson insulator, to a conventional quasiparticle glass, and finally to a ferromagnetic Skyrmion quasiparticle glass. These different regimes can be measured in low-temperature transport and NMR experiments. We present calculations for the NMR spectra in different disorder regimes.

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Jairo Sinova, A. H. MacDonald, S. M. Girvin. 2002-04-12. Disorder and interactions in quantum Hall ferromagnets: effects of disorder in Skyrmion physics. https://doi.org/10.1016/s1386-9477(01)00263-6

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