Some Generic Aspects of Bosonic Excitations in Disordered Systems
Physical Review Letters 89 (2002) 136801 4pp
Negative scaling dimensions and conformal invariance at the Nishimori point in the +/-J random-bond Ising model
(2002)
Quantum Hall ferromagnets, cooperative transport anisotropy, and the random field Ising model
ArXiv cond-mat/0208024 (2002)
Abstract:
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 [Zeitler et al, Phys. Rev. Lett. 86, 866 (2001); Pan et al, Phys. Rev. B 64, 121305 (2001)], 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.Quantum Hall ferromagnets, cooperative transport anisotropy, and the random field Ising model
(2002)
Some generic aspects of bosonic excitations in disordered systems
(2002)