Broken symmetries and thermodynamic limit in quantum antiferromagnets |
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Authors: | B Bernu C Lhuillier L Pierre |
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Affiliation: | (1) Laboratoire de Physique Théorique des Liquides, Université P. et M. Curie, boite 121, 4 Place Jussieu, 75252 Paris Cedex. URA 765 of CNRS;(2) U.F.R. SEGMI, Université Paris-X, Nanterre, 92001 Nanterre Cedex |
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Abstract: | We study how the Néel order breaks the symmetries of the hamiltonian in quantum antiferromagnet. The construction of a quantum wave packet that mimics the classical groundstate implies the existence of an extensive number of states: 1) with an energy scale much smaller than the spin-waves excitations (magnons); 2) with well defined symmetries.For the case of the triangular lattice, we find that all necessary properties to obtain a Néel state are well verified, already on periodic samples as small as 21 spins. For this system, this is a new and strong evidence of Néel order in the thermodynamic limit. |
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