Spectral Function of a Quarter-Filled One-Dimensional Charge Density Wave Insulator
Physical Review Letters 88 (2002) 096403 4pp
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
Hydrodynamics of topological defects in nematic liquid crystals
(2002)
Spin textures, screening, and excitations in dirty quantum Hall ferromagnets.
Phys Rev Lett 88:3 (2002) 036801
Abstract:
We study quantum Hall ferromagnets in the presence of a random electrostatic impurity potential. Describing these systems with a classical nonlinear sigma model and using analytical estimates supported by results from numerical simulations, we examine the nature of the ground state as a function of disorder strength, Delta, and deviation, deltanu, of the average Landau level filling factor from unity. Screening of an impurity potential requires distortions of the spin configuration, and in the absence of Zeeman coupling there is a disorder-driven, zero-temperature phase transition from a ferromagnet at small Delta and /deltanu/ to a spin glass at larger Delta or /deltanu/. We examine ground-state response functions and excitations.BPS kinks in the Gross-Neveu model
Physical Review D American Physical Society (APS) 65:2 (2002) 025001