Haldane-gapped spin chains: Exact low-temperature expansions of correlation functions
Haldane-gapped spin chains: Exact low-temperature expansions of correlation functions
We study both the static and dynamic properties of gapped, one-dimensional, Heisenberg, anti-ferromagnetic, spin chains at finite temperature through an analysis of the O(3) non-linear sigma model. Exploiting the integrability of this theory, we are able to compute an exact low temperature expansion of the finite temperature correlators. We do …