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Abstract : We show that the finite size scaling analysis of the quantum non linear sigma model O3-O2 associated with antiferromagnets justifies the existence of the tower of excited states first proposed by Anderson to explain the symmetry breaking of quantum antiferromagnets in the thermodynamical limit. Finite size formulas for the ground state energy and for the ground state expectation value of the order parameter are explicitly given.





Author: P. Azaria B. Delamotte D. Mouhanna

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



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