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- W4302007689 abstract "After a sudden quench from the disordered high-temperature $T_0toinfty$ phase to a final temperature below the critical point $T_F ll T_c$, the non-conserved order parameter dynamics of the two-dimensional ferromagnetic Ising model on a square lattice (2dIM) initially approaches the critical percolation state before entering the coarsening regime. This approach involves two timescales associated with the first appearance (at time $t_{{rm p}_1}>0$) and stabilization (at time $t_{rm p}>t_{{rm p}_1}$) of a giant percolation cluster, as previously reported. However, the microscopic mechanisms that control such timescales are not yet fully understood. In this paper, in order to study their role on each time regime after the quench ($T_F=0$), we distinguish between spin flips that decrease the total energy of the system from those that keep it constant, the latter being parametrized by the probability $p$. We show that the cluster size heterogeneity $H(t,p)$ and the typical domain size $ell (t,p)$ have no dependence on $p$ in the first time regime up to $t_{{rm p}_1}$. On the other hand, the time for stabilizing a percolating cluster is controlled by the acceptance probability of constant-energy flips: $t_{rm p}(p) sim p^{-1}$ for $pll 1$ (at $p=0$, the dynamics gets stuck in a metastable state). These flips are also the relevant ones in the later coarsening regime where dynamical scaling takes place. Because the phenomenology on the approach to the percolation point seems to be shared by many 2d systems with a non-conserved order parameter dynamics (and certain cases of conserved ones as well), our results may suggest a simple and effective way to set, through the dynamics itself, $t_{{rm p}_1}$ and $t_{rm p}$ in such systems." @default.
- W4302007689 created "2022-10-06" @default.
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- W4302007689 date "2022-10-05" @default.
- W4302007689 modified "2023-10-16" @default.
- W4302007689 title "Energy-lowering and constant-energy spin flips: Emergence of the percolating cluster in the kinetic Ising model" @default.
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- W4302007689 doi "https://doi.org/10.1103/physreve.106.044105" @default.
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