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】
Free