Federico Ricci-Tersenghi: Rejuvenation and Memory: Amazing Effects in the Spin Glass Dynamics,

Title: Rejuvenation and Memory: Amazing Effects in the Spin Glass Dynamics, Involving Several Growing Length Scales

Abstract: Spin glasses are disordered magnets whose relaxation times are so large that never reach equilibrium at low temperatures, even on experimental time scales. In their out-of-equilibrium dynamics, experimental spin glasses show amazing effects, called rejuvenation and memory, whose explanation has remained elusive for decades, given the inability of reproducing such effects in numerical simulations.
I will present the results of the first large-scale numerical simulation which has been able to reproduce such effects, exploiting the computational power of the Janus 2 dedicated computer.
The microscopic explanation of these effects requires the measurement of more than a single growing length scale, something that currently can be achieved only in numerical simulations.