Disorder and interactions in quantum Hall ferromagnets: effects of disorder in Skyrmion physics
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.
- Publication:
-
Physica E Low-Dimensional Systems and Nanostructures
- Pub Date:
- January 2002
- DOI:
- 10.1016/S1386-9477(01)00263-6
- arXiv:
- arXiv:cond-mat/0204288
- Bibcode:
- 2002PhyE...12...16S
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 3 pages, 3 figures, proceedings for EP2DS-14, Prague 2001