Asymptotic scaling of the square lattice quantum Heisenberg antiferromagnet

Abstract

We present thermodynamic measurements of various physical observables of the two dimensional S=1/2 isotropic quantum Heisenberg antiferromagnet on a square lattice, obtained by quantum Monte Carlo. In particular we have been able to measure the infinite volume limit of the uniform susceptibility up to the inverse temperature beta=40, the analysis of which reveals the correct asymptotic behavior in excellent agreement with the prediction of chiral perturbation theory. The controversy over the existence of a crossover from quantum critical to renormalized classical regime is resolved.

5 pages, 4 figures; two references added in revised version

References in corpus (2)

• The Square-Lattice Heisenberg Antiferromagnet at Very Large Correlation Lengths
• Perturbative renormalization group, exact results and high temperature series to order 21 for the N-vector spin models on the square lattice

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