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

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

2002-04-12

arxiv.org/abs/cond-mat/0204288v1

Physica E 12, 16 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures, proceedings for EP2DS-14, Prague 2001

Scientific paper

10.1016/S1386-9477(01)00263-6

We present a Hartree-Fock study of the competition between disorder and interactions in quantum Hall ferromagnets near $\nu=1$. We find that the ground state at $\nu=1$ 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 $\nu=1$, 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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