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

Fernandes, Henrique Almeida Fernandes; Silva, Roberto da Silva; Caparica, Álvaro de Almeida; Felicio, Jose Roberto Drugowich de Felicio

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

Data

2017

Autores

Fernandes, Henrique Almeida Fernandes

Silva, Roberto da Silva

Caparica, Álvaro de Almeida

Felicio, Jose Roberto Drugowich de Felicio

Resumo

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.

Citação

FERNANDES, H. A. et al. Nonequilibrium critical dynamics of the two-dimensional Ashkin-Teller model at the Baxter line. Physical Review E, Ridge, v. 95, e042105, 2017. DOI: 10.1103/PhysRevE.95.042105. Disponível em: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.95.042105. Acesso em: 11 set. 2023.