We perform a rigorous computation of the specific heat of the Ashkin-Teller model in the case of small interaction and we explain how the universality-nonuniversality crossover is realized when the isotropic limit is reached. We prove that, even in the region where universality for the specific heat holds, anomalous critical exponents appear: for instance, we predict the existence of a previously unknown anomalous exponent, continuously varying with the strength of the interaction, describing how the difference between the critical temperatures rescales with the anisotropy parameter.
GIULIANI A, & MASTROPIETRO V (2004). Anomalous critical exponents in the anisotropic Ashkin-Teller model. PHYSICAL REVIEW LETTERS, 93, 190603.
Titolo: | Anomalous critical exponents in the anisotropic Ashkin-Teller model |
Autori: | |
Data di pubblicazione: | 2004 |
Rivista: | |
Citazione: | GIULIANI A, & MASTROPIETRO V (2004). Anomalous critical exponents in the anisotropic Ashkin-Teller model. PHYSICAL REVIEW LETTERS, 93, 190603. |
Abstract: | We perform a rigorous computation of the specific heat of the Ashkin-Teller model in the case of small interaction and we explain how the universality-nonuniversality crossover is realized when the isotropic limit is reached. We prove that, even in the region where universality for the specific heat holds, anomalous critical exponents appear: for instance, we predict the existence of a previously unknown anomalous exponent, continuously varying with the strength of the interaction, describing how the difference between the critical temperatures rescales with the anisotropy parameter. |
Handle: | http://hdl.handle.net/11590/143429 |
Appare nelle tipologie: | 1.1 Articolo in rivista |