F. Igloi et L. Turban, COMMON TRENDS IN THE CRITICAL-BEHAVIOR OF THE ISING AND DIRECTED WALKMODELS, Physical review letters, 77(7), 1996, pp. 1206-1209
We consider layered two-dimensional Ising and directed walk models and
show that the two problems are inherently related. The information ab
out the zero-field thermodynamical properties of the Ising model is co
ntained in the transfer matrix of the directed walk. For several hiera
rchical and aperiodic distributions of the couplings, critical exponen
ts for the two problems are obtained exactly through renormalization.