Temperature dependent correlation length for the S=1/2 Quantum Heisenberg Antiferromagnet on the square lattice
Jae-Kwon Kim, D. P. Landau, Matthias Troyer
Abstract
We present an analysis of high precision Monte Carlo data for the two dimensional S=1/2 quantum Heisenberg antiferromagnet up to ξ= 95.7(3) obtained by the continuous time version of the loop algorithm. Our data are in good agreement with a prediction of the recent theory (Phys. Rev. Lett. vol. 77, 3439 (1996)) in very high temperature regime, but they strongly disagree with it in the low temperature regime.
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