Dynamics of quenching temperature is studied in pure and random Ising chains. Using the Kibble-Zurek argument, we obtain for the pure Ising model that the density of kinks after quenching decays as 1/\sqrt{ \tau} with the quench rate of temperature 1/\tau for large \tau. For the random Ising model, we show that decay rates of the density of kinks and the residual energy are 1/\ln\tau and 1/(\ln\tau)^2 for large \tau respectively. Analytic results for the random Ising model are confirmed by the Monte-Carlo simulation. Our results reveal a clear difference between classical and quantum quenches in the random Ising chain.
Categories: cond-mat.dis-nn cond-mat.stat-mech quant-ph