Duncan Campbell (Carnegie Mellon)
Thu, 23 May 2019, 11:00
"A short story of non-thermal fixed points"
Christian-Marcel Schmied
Thu, 23 May 2019, 13:00

Special Lecture: From unitary dynamics to statistical mechanics in isolated quantum chaotic systems

Marcos Rigol , Penn State University
Recently, experiments with ultracold gases have made it possible to study dynamics of (nearly) isolated quantum many-body systems, which has revived theoretical interest on this topic. In generic isolated systems, one expects nonequilibrium dynamics to result in thermalization: a relaxation to states where the values of macroscopic quantities are stationary, universal with respect to widely differing initial conditions, and predictable through the time-tested recipe of statistical mechanics. However, it is not obvious what feature of a many-body system makes quantum thermalization possible, in a sense analogous to that in which dynamical chaos makes classical thermalization possible. Underscoring that new rules could apply in the quantum case, experimental studies in one-dimensional systems have shown that traditional statistical mechanics can provide wrong predictions for the outcomes of relaxation dynamics. We show that isolated quantum chaotic systems do in fact relax to states in which observables are well-described by statistical mechanics. Moreover, we argue that the time evolution itself plays a merely auxiliary role as thermalization happens at the level of individual eigenstates.
28 May 2019, 00:00
Institut für Theoretische Physik, INF 226, Goldene Box

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