On the nature of the order parameter in quantum antiferromagnetsReport as inadecuate




On the nature of the order parameter in quantum antiferromagnets - Download this document for free, or read online. Document in PDF available to download.



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.





Author: Joseph Reger

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



DOWNLOAD PDF




Related documents