Zero-temperature Glauber dynamics on small-world networks

The zero-temperature Glauber dynamics of the ferromagnetic Ising model on small-world networks, rewired from a two-dimensional square lattice, has been studied by numerical simulations. For increasing disorder in finite networks, the nonequilibrium dynamics becomes faster, so that the ground state is found more likely. For any finite value of the rewiring probability p, the likelihood of reaching the ground state goes to zero in the thermodynamic limit, similarly to random networks. The spin correlation xi(r) is found to decrease with distance as xi(r) ~ exp(-r/lambda), lambda being a correlation length scaling with p as lambda ~ p^(-0.73). These results are compared with those obtained earlier for addition-type small world networks.