Representations of the quadratic algebra and partially asymmetric diffusion with open boundaries
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL 29:13 (1996) 3375-3407
Splitting the multiphase point
PHASE TRANSIT 57:1-3 (1996) 49-58
Abstract:
Models with competing interactions, for example the ANNNI model, can have special points at which the ground state is infinitely degenerate, so-called multiphase points. Small perturbations can lift this degeneracy and give rise to infinite sequences of long-period phases. This paper compares the effect of three possible perturbations, quantum fluctuations, thermal fluctuations and the softening of the spins from their quantised positions.The supersymmetric t-J model with a boundary
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL 29:19 (1996) 6183-6203
Determinant representation for a quantum correlation function of the lattice sine-Gordon model
(1995)
Exact Perturbative Solution of the Kondo Problem
Physical Review Letters American Physical Society (APS) 75:24 (1995) 4492-4495