Exact results for the sigmaz two-point function of the XXZ chain at Delta=1/2
Abstract
We propose a new multiple integral representation for the correlation function <sigma1z sigmam+1z> of the XXZ spin-1/2 Heisenberg chain in the disordered regime. We show that for Delta=1/2 the integrals can be separated and computed exactly. As an example we give the explicit results up to the lattice distance m=8. It turns out that the answer is given as integer numbers divided by 2[(m+1)2].
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