Physics – Condensed Matter
Scientific paper
1997-09-16
Physics
Condensed Matter
4 pages, RevTeX + 5 encapsulated postscript figures
Scientific paper
10.1103/PhysRevLett.80.1746
We study the low energy spectrum of the nearest neighbor Heisenberg model on a square lattice as a function of the total spin S. By quantum Monte Carlo simulation we compute this spectrum for the s=1/2, s=1 and s=3/2 Heisenberg models. We conclude that the nonlinear sigma model prediction for the low energy spectrum is always verified for large enough system size. However the crossover to the correct scaling regime is particularly slow just for the s=1/2 Heisenberg model. The possibility to detect this unexpected anomaly with finite temperature experiments on s=1/2 isotropic quantum antiferromagnets is also discussed.
Lavalle C.
Parola Alberto
Sorella Sandro
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