Magnon Wave-function and Impurity Effects in S=1 Antiferromagnetic Chains: A Large-n Approach
Strongly Correlated Electrons
2012-02-27 v1 High Energy Physics - Theory
Abstract
A large-n approximation to the S=1 antiferromagnetic chain, using the symmetric tensor representation and its conjugate, is developed to order 1/n in order to calculate the magnon wave-function and to study the effect of modifying the exchange coupling from J to J' on a single link. It is shown that a magnon boundstate exists below the Haldane gap for arbitrarily small negative J'-J but only above a certain critical value of J'-J for positive values. In the former case the binding energy vanishes as the square of (J-J').
Cite
@article{arxiv.cond-mat/9808345,
title = {Magnon Wave-function and Impurity Effects in S=1 Antiferromagnetic Chains: A Large-n Approach},
author = {Alistair Savage and Ian Affleck},
journal= {arXiv preprint arXiv:cond-mat/9808345},
year = {2012}
}
Comments
revtex, 22 pages, 15 eps figures