Order from Disorder in Graphene Quantum Hall Ferromagnet

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dc.creatorAbanin, Dmitry A.
dc.creatorLee, Patrick A.
dc.creatorLevitov, Leonid S.
dc.date2006-11-02
dc.date.accessioned2026-07-07T09:32:03Z
dc.date.available2026-07-07T09:32:03Z
dc.descriptionValley-polarized quantum Hall states in graphene are described by a Heisenberg O(3) ferromagnet model, with the ordering type controlled by the strength and sign of valley anisotropy. A mechanism resulting from electron coupling to strain-induced gauge field, giving leading contribution to the anisotropy, is described in terms of an effective random magnetic field aligned with the ferromagnet z axis. We argue that such random field stabilizes the XY ferromagnet state, which is a coherent equal-weight mixture of the $K$ and $K'$ valley states. Other implications such as the Berezinskii-Kosterlitz-Thouless ordering transition and topological defects with half-integer charge are discussed.
dc.description4 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0611062
dc.identifierhttp://arxiv.org/abs/cond-mat/0611062
dc.identifierPhys. Rev. Lett. 98, 156801 (2007)
dc.identifierdoi:10.1103/PhysRevLett.98.156801
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158673
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleOrder from Disorder in Graphene Quantum Hall Ferromagnet
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