Q-Dependent Susceptibilities in Ferromagnetic Quasiperiodic Z-Invariant Ising Models
Abstract
We study the q-dependent susceptibility chi(q) of a series of quasiperiodic Ising models on the square lattice. Several different kinds of aperiodic sequences of couplings are studied, including the Fibonacci and silver-mean sequences. Some identities and theorems are generalized and simpler derivations are presented. We find that the q-dependent susceptibilities are periodic, with the commensurate peaks of chi(q) located at the same positions as for the regular Ising models. Hence, incommensurate everywhere-dense peaks can only occur in cases with mixed ferromagnetic-antiferromagnetic interactions or if the underlying lattice is aperiodic. For mixed-interaction models the positions of the peaks depend strongly on the aperiodic sequence chosen.
Keywords
Cite
@article{arxiv.cond-mat/0606301,
title = {Q-Dependent Susceptibilities in Ferromagnetic Quasiperiodic Z-Invariant Ising Models},
author = {Helen Au-Yang and Jacques H. H. Perk},
journal= {arXiv preprint arXiv:cond-mat/0606301},
year = {2011}
}
Comments
LaTeX2e, 26 pages, 9 figures (27 eps files). v2: Misprints corrected