Effective actions for spin ladders
Strongly Correlated Electrons
2009-01-23 v3
Abstract
We derive a path-integral expression for the effective action in the continuum limit of an AFM Heisenberg spin ladder with an arbitrary number of legs. The map is onto an nonlinear -model (NLM) with the addition of a topological term that is effective only for odd-legged ladders and half-odd integer spins. We derive the parameters of the effective NLM and the behaviour of the spin gap for the case of even-legged ladders.
Cite
@article{arxiv.cond-mat/9610148,
title = {Effective actions for spin ladders},
author = {S. Dell'Aringa and E. Ercolessi and G. Morandi and P. Pieri and M. Roncaglia},
journal= {arXiv preprint arXiv:cond-mat/9610148},
year = {2009}
}
Comments
Final version, as published in Phys. Rev. Lett