Lookup NU author(s): Dr Gary Liu,
Professor Nikolaos Proukakis
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The formation of an equilibrium state from an uncorrelated thermal one through the dynamical crossing of a phase transition is a central question of quantum many-body physics. During such crossing, the system breaks its symmetry by establishing numerous uncorrelated regions separated by spontaneously generated defects, whose emergence obeys a universal scaling law with quench duration. The ensuing re-equilibrating or “coarse-graining” stage is governed by the evolution and interactions of such defects under system-specific and external constraints. We perform a detailed numerical characterisation of the entire non-equilibrium process associated with the Bose–Einstein condensation phase transition in a three-dimensional gas of ultracold atoms, addressing subtle issues and demonstrating the quench-induced decoupling of condensate atom number and coherence growth during the re-equilibration process. Our findings agree, in a statistical sense, with experimental observations made at the later stages of the quench, and provide valuable information and useful dynamical visualisations in currently experimentally inaccessible regimes.
Author(s): Liu IK, Donadello S, Lamporesi G, Ferrari G, Gou SC, Dalfovo F, Proukakis NP
Publication type: Article
Publication status: Published
Journal: Communications Physics
Online publication date: 11/06/2018
Acceptance date: 12/04/2018
Date deposited: 28/06/2018
ISSN (electronic): 2399-3650
Publisher: Nature Publishing Group
Data Source Location: https://doi.org/10.17634/122626-7
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