Disordered quantum Hall ferromagnets and cooperative transport anisotropy

Conference item

We discuss the behaviour of a quantum Hall system when two Landau levels with opposite spin 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 (Phys. Rev. Lett. 86 (2001) 866; Phys. Rev. B 64 (2001) 121305), in which a large resistance anisotropy develops at low temperatures. Modelling 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. (C) 2003 Elsevier B.V. All rights reserved.

Authors: Chalker, J; Polyakov, D; Evers, F; Mirlin, A; Wolfle, P

• Publication status: Published
• Journal: PHYSICA E-LOW-DIMENSIONAL SYSTEMS and NANOSTRUCTURES
• Volume: 22
• Issue: 1-3
• Pages: 82-85
• Publication date: 2004-04-01
• Event title: 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-15)
• DOI: 10.1016/j.physe.2003.11.221
• ISSN: 1386-9477
• Keywords: quantum Hall ferromagnetism; domain walls; electron-electron interactions; Ising model; quantum Hall effect