|Out-of-equilibrium critical dynamics at surfaces|
|Friday 28 May 2004 , 11h00|
|Talk at the workshop (2004)|
Nonequilibrium surface autocorrelation and autoresponse functions are studied in semi-infinite critical systems. In the short time regime an unusual stationary stretched exponential behaviour of the dynamical surface autocorrelation is observed in cases where the equilibrium surface autocorrelation function decays very fast. This behaviour, which is due to a novel mechanism called cluster dissolution, also takes place in the critical semi-infinite three-dimensional Ising model. Ageing processes showing up in the dynamical scaling regime are also discussed. Integrated surface response functions are confronted with predictions coming from the theory of local scale invariance. The asymptotic value of the nonequilibrium surface fluctuation-dissipation ratio is shown to depend on the value of the surface scaling dimension.