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Nonequilibrium critical dynamics of the two-dimensional Ashkin-Teller model at the Baxter line

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Nonequilibrium critical dynamics of the two-dimensional Ashkin-Teller model at the Baxter line

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Título Nonequilibrium critical dynamics of the two-dimensional Ashkin-Teller model at the Baxter line
Autor Fernandes, Henrique Almeida
Silva, Roberto da
Caparica, Álvaro de Almeida
Felício, José Roberto Drugovich de
Abstract We investigate the short-time universal behavior of the two-dimensional Ashkin-Teller model at the Baxter line by performing time-dependent Monte Carlo simulations. First, as preparatory results, we obtain the critical parameters by searching the optimal power-law decay of the magnetization. Thus, the dynamic critical exponents θm and θp, related to the magnetic and electric order parameters, as well as the persistence exponent θg, are estimated using heat-bath Monte Carlo simulations. In addition, we estimate the dynamic exponent z and the static critical exponents β and ν for both order parameters. We propose a refined method to estimate the static exponents that considers two different averages: one that combines an internal average using several seeds with another, which is taken over temporal variations in the power laws.Moreover, we also performed the bootstrapping method for a complementary analysis. Our results show that the ratio β/ν exhibits universal behavior along the critical line corroborating the conjecture for both magnetization and polarization.
Contido em Physical review. E, Statistical, nonlinear, and soft matter physics. Melville. Vol. 95, no. 4 (Apr. 2017), 042105, 14 p.
Assunto Método de Monte Carlo
Modelo de ising
Pontos criticos
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/168954
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