Monte carlo study of correlations in quantum spin ladders

M. Greven, R. J. Birgeneau, U. J. Wiese

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Abstract

We study antiferromagnetic spin-1/2 Heisenberg ladders, comprised of nc chains [Formula presented] with ratio [Formula presented] of interchain to intrachain couplings. The correlation length ξ(T) is deduced from measurements of the correlation function. For even nc, the static structure factor exhibits a peak at a temperature below the corresponding spin gap. Results for isotropically coupled ladders [Formula presented] are compared to those for the single chain and the square lattice. For [Formula presented], the correlation function of the two-chain ladder is in excellent agreement with analytic results from conformal field theory, and ξ(T) exhibits simple scaling behavior.

Original languageEnglish (US)
Pages (from-to)1865-1868
Number of pages4
JournalPhysical review letters
Volume77
Issue number9
DOIs
StatePublished - 1996
Externally publishedYes

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