title: Far-From-Equilibrium Quantum Many-Body Systems: From Universal Dynamics to Statistical Mechanics
creator: Erne, Sebastian Anton
subject: ddc-530
subject: 530 Physics
description: This thesis examines, alongside a series of experiments, the far-from-equilibrium dynamics of isolated quantum many-body systems. As a model example we study the relaxation of a single and two linearly coupled one-dimensional Bose gases, brought out off equilibrium through a rapid change in the system parameters. For the single Bose gas this quench is a rapid cooling of the system to the one-dimensional regime, leading to a far-from-equilibrium state. In the subsequent relaxation towards thermal equilibrium we find direct experimental evidence for a scaling evolution in space and time, signaling the approach of a non-thermal fixed point and universality far from equilibrium. For the two linearly coupled gases we demonstrate how the analysis of higher-order correlations and their factorization properties can be used to determine the validity of effective field theories. In thermal equilibrium we find the system is described by the sine-Gordon model up to 10th -order correlations. Lastly, the relaxation of two independent condensates, initialized in a strongly phase-correlated state, is studied in the context of prethermalization, generalized statistical ensembles, and quantum recurrences. Our work paves the way for future studies of universality far from equilibrium.
date: 2018
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/25106/1/Far-From-Equilibrium%20Quantum%20Many-Body%20Systems%20-%20From%20Universal%20Dynamics%20to%20Statistical%20Mechanics.pdf
identifier: DOI:10.11588/heidok.00025106
identifier: urn:nbn:de:bsz:16-heidok-251061
identifier:   Erne, Sebastian Anton  (2018) Far-From-Equilibrium Quantum Many-Body Systems: From Universal Dynamics to Statistical Mechanics.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/25106/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng