N -Color Ashkin-Teller Model in Two Dimensions: Solution in the Large- N Limit
1984; American Physical Society; Volume: 53; Issue: 21 Linguagem: Inglês
10.1103/physrevlett.53.1967
ISSN1092-0145
Autores Tópico(s)Quantum many-body systems
ResumoThe $N$-color Ashkin-Teller model is solved exactly in the large-$N$ limit in two dimensions. The phase diagram is found. It is shown that for positive four-spin coupling the transition is first order while for negative four-spin coupling the transition is continuous and Ising type. The specific heat near the second-order transition is calculated and it is found to be finite at the transition because of large corrections to scaling. The latent heat and correlation length at the first-order transition are also calculated.
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