20 papers
On the Beta Function for Anisotropic Current Interactions in 2D
B. Gerganov, A. LeClair, M. Moriconi
By making use of current-algebra Ward identities we study renormalization of general anisotropic current-current interactions in 2D. We obtain a set of algebraic conditions that en…
Quasi-Spin-Charge Separation and the Spin Quantum Hall Effect
D. Bernard, A. LeClair
We use quantum field theory methods to study the network model for the spin quantum hall transition. When the couplings are fine tuned in a certain way, the spin and charge degrees…
The Exact S-Matrix for an osp(2|2) Disordered System
Z. S. Bassi, A. LeClair
We study a two-dimensional disordered system consisting of Dirac fermions coupled to a scalar potential. This model is closely related to a more general disordered system that has…
gl(N|N) Super-Current Algebras for Disordered Dirac Fermions in Two Dimensions
S. Guruswamy, A. LeClair, A. W. W. Ludwig
We consider the non-hermitian 2D Dirac Hamiltonian with (A): real random mass, imaginary scalar potential and imaginary gauge field potentials, and (B) arbitrary complex random pot…
Plateaux Transitions from S-matrices based on SL(2,Z) Invariant Field Theories
I. Devetak, A. LeClair
A scattering scattering description is proposed for a boundary perturbation of a c=1 SL(2,Z) invariant conformal field theory. The bulk massless S-matrices are of the form of Zamol…
On the Relevance of Disorder for Dirac Fermions with Imaginary Vector Potential
Andre' LeClair
We consider the effects of disorder in a Dirac-like Hamiltonian. In order to use conformal perturbation theory, we argue that one should consider disorder in an imaginary vector po…