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Abstract : The first moments of the magnetization mz of the d=2, S=1-2 quantum Heinsenberg antiferromagnet with nearest neighbor interactions on the square lattice are computed for T=0 via path integral Monte Carlo Simulations. The results for the ratio R=〈m4z 〉- 〈m2z 〉2 show a cross-over at a system size of N ≈100 to the classical behavior, lim N↦∞ R = 9-5. This supports the arguments that the long range order in the ground state is reached by a spontaneous symmetry breaking, just as in the classical case.





Autor: Joseph Reger

Fuente: https://hal.archives-ouvertes.fr/



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