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EnglishWe investigate the controversial issue of the existence of universality classes describing critical phenomena in three-dimensional systems characterized by a matrix order parameter with symmetry O(2)xO(N) and symmetry-breaking pattern O(2)xO(N)-->O(2)xO(N-2). Physical realizations of these systems are, for example, frustrated spin models with noncollinear order. Starting from the field-theoretical Landau-Ginzburg-Wilson Hamiltonian, we consider the massless critical theory and the minimal-subtraction scheme without epsilon expansion. The three-dimensional analysis of the corresponding five-loop series shows the existence of a stable fixed point for N=2 and N=3, confirming recent field-theoretical results based on a six-loop expansion in the alternative zero-momentum renormalization scheme defined in the massive disordered phase. In addition, we report numerical Monte Carlo simulations of a class of three-dimensional O(2)xO(2)-symmetric lattice models. The results provide further support to the existence of the O(2)xO(2) universality class predicted by the field-theoretical analyses.
| Autori interni: | ||
| Autori: | Calabrese P; Parruccini P; Pelissetto A; Vicari E | |
| Titolo: | Critical behavior of O(2)circle times O(N) symmetric models | |
| Anno del prodotto: | 2004 | |
| Digital Object Identifier (DOI): | 10.1103/PhysRevB.70.174439 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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