Abstract
We perform numerical simulations of the 2-d Heisenberg antiferromagnet using a cluster algorithm. Comparing the size and temperature effects of various quantities with results from chiral perturbation theory we determine the low energy parameters of the system very precisely. We finde 0=−0.6693(1)J/a 2 for the ground state energy density, ℳ s = 0.3074(4)/a 2 for the staggered magnetization,ħc=1.68(1)J a for the spin wave velocity andp s =0.186(4)J for the spin stiffness. Our results agree with experimental data for the precursor insulators of high-T c superconductors.
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Supported by the Schweizer Nationalfond