Vendredi 27 mai 2016 à 14h15
Auditoire Stueckelberg, Ecole de Physique

Universality, short-time dynamics and aging after a quench in isolated quantum systems

Andrea Gambassi, SISSA

Analogously to phase transitions in equilibrium, collective non-equilibrium behaviours may emerge after a quench, with an associated dynamical critical point characterised by scale invariance and universality. Within a renormalization-group approach and via exact solutions we demonstrate that a system deeply quenched close to such a dynamical critical point exhibits a scaling regime at short times after the quench, which is however dynamically unstable. Within this unusual non-thermal regime, dynamical correlations are characterized by universal exponents and aging, which we investigate both analytically and numerically.