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Accueil du site > Séminaires > LKB > Relaxation Dynamics and Pre-thermalization in a Quantum System

Relaxation Dynamics and Pre-thermalization in a Quantum System

Exposé de Tim Langen

Vendredi 4 novembre 2011, 9h15 dans la salle de réunion du siège de l’IFRAF, au 4e étage du batiment Rataud, à l’ENS au 45 rue d’Ulm, Paris 5e.

Résumé :

Questions of relaxation processes in quantum many-body systems arise in many areas of physics ranging from cosmology to high-energy physics to condensed matter. These problems remain a challenge despite considerable theoretical and experimental efforts, and their difficulty is exacerbated by the scarcity of experimental tools for characterizing complex transient states.

We report an experimental study of the relaxation dynamics of a coherently split one-dimensional Bose gas through measurements of full probability distributions of matter-wave interference patterns, which provides us with unprecedented information about the dynamical states of the system.

Following an initial rapid evolution, the distributions approach an apparent thermal-like steady state characterized by an effective temperature eight times lower than the initial equilibrium temperature of the system before the splitting process.

This dynamical phenomenon is the first demonstration of the existence of pre-thermalization, showing that the evolution of non-equilibrium many-body quantum systems is a far richer process than has been assumed in the past.


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