Finite temperature density matrix and two-point correlations in the antiferromagnetic XXZ chain
Frank Göhmann, Nils P. Hasenclever, Alexander Seel
Abstract
We derive finite temperature versions of integral formulae for the two-point correlation functions in the antiferromagnetic XXZ chain. The derivation is based on the summation of density matrix elements characterizing a finite chain segment of length m. On this occasion we also supply a proof of the basic integral formula for the density matrix presented in an earlier publication.
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