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)
The two-dimensional random-bond Ising model, free fermions and the network model
Physical Review B: Condensed Matter and Materials Physics 65 (2002) 054425 18pp