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

作者：Fernandes H A^*; da Silva R; Caparica A A; de Felicio J R Drugowich

来源：PHYSICAL REVIEW E, 2017, 95(4): 042105.

DOI：10.1103/PhysRevE.95.042105

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 theta(m) and theta(p), related to the magnetic and electric order parameters, as well as the persistence exponent theta(g), are estimated using heat-bath Monte Carlo simulations. In addition, we estimate the dynamic exponent z and the static critical exponents beta and nu 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 beta/nu exhibits universal behavior along the critical line corroborating the conjecture for both magnetization and polarization.

• 出版日期2017-4-5