non-equilibrium dynamics
Feed: Science: Current Issue
Posted on: Friday, 10 April 2015 10:00 AM
Author: Tim Langen
Subject: [Report] Experimental observation of a generalized Gibbs ensemble
The description of the non-equilibrium dynamics of isolated quantum many-body systems within the framework of statistical mechanics is a fundamental open question. Conventional thermodynamical ensembles fail to describe the large class of systems that exhibit nontrivial conserved quantities, and generalized ensembles have been predicted to maximize entropy in these systems. We show experimentally that a degenerate one-dimensional Bose gas relaxes to a state that can be described by such a generalized ensemble. This is verified through a detailed study of correlation functions up to 10th order. The applicability of the generalized ensemble description for isolated quantum many-body systems points to a natural emergence of classical statistical properties from the microscopic unitary quantum evolution. Authors: Tim Langen, Sebastian Erne, Remi Geiger, Bernhard Rauer, Thomas Schweigler, Maximilian Kuhnert, Wolfgang Rohringer, Igor E. Mazets, Thomas Gasenzer, Jörg Schmiedmayer
View article...<http://www.sciencemag.org/content/348/6231/207.summary?rss=1>
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