Quantum Hall ferromagnets, cooperative transport anisotropy, and the random field Ising model

Article

关键词: 2-DIMENSIONAL ELECTRON LIQUID;    TILTED MAGNETIC-FIELDS;    INSTABILITY;    STATE;    GAS;   

DOI  :  10.1103/PhysRevB.66.161317

来源: SCIE

【 摘 要 】

We discuss the behavior of a quantum Hall system when two Landau levels with opposite spins and combined filling factor near unity are brought into energetic coincidence using an in-plane component of magnetic field. We focus on the interpretation of recent experiments under these conditions [Zeitler , Phys. Rev. Lett. 86, 866 (2001); Pan , Phys. Rev. B 64, 121305 (2001)], in which a large resistance anisotropy develops at low temperatures. Modeling the systems involved as Ising quantum Hall ferromagnets, we suggest that this transport anisotropy reflects domain formation induced by a random field arising from isotropic sample surface roughness.

【 授权许可】

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