Low-energy properties of aperiodic quantum spin chains
Abstract
We investigate the low-energy properties of antiferromagnetic quantum XXZ spin chains with couplings following two-letter aperiodic sequences, by an adaptation of the Ma-Dasgupta-Hu renormalization-group method. For a given aperiodic sequence, we argue that in the easy-plane anisotropy regime, intermediate between the XX and Heisenberg limits, the general scaling form of the thermodynamic properties is essentially given by the exactly known XX behavior, providing a classification of the effects of aperiodicity on XXZ chains. As representative illustrations, we present analytical and numerical results for the low-temperature thermodynamics and the ground-state correlations for couplings following the Fibonacci quasiperiodic structure and a binary Rudin-Shapiro sequence, whose geometrical fluctuations are similar to those induced by randomness.
Keywords
Cite
@article{arxiv.cond-mat/0403635,
title = {Low-energy properties of aperiodic quantum spin chains},
author = {André P. Vieira},
journal= {arXiv preprint arXiv:cond-mat/0403635},
year = {2007}
}
Comments
Published version