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  Universal dynamics in an isolated one-dimensional Bose gas far from equilibrium

Erne, S., Bücker, R., Gasenzer, T., Berges, J., & Schmiedmayer, J. (2018). Universal dynamics in an isolated one-dimensional Bose gas far from equilibrium. Nature, 563(7730), 225-229. doi:10.1038/s41586-018-0667-0.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-9300-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-A638-4
Genre: Journal Article

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https://dx.doi.org/10.1038/s41586-018-0667-0 (Publisher version)
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 Creators:
Erne, S.1, 2, 3, Author
Bücker, R.1, 4, Author              
Gasenzer, T.2, 5, Author
Berges, J.2, Author
Schmiedmayer, J.1, Author
Affiliations:
1Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, ou_persistent22              
2Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, ou_persistent22              
3School of Mathematical Sciences, Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, University of Nottingham, ou_persistent22              
4Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
5Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, ou_persistent22              

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 Abstract: Understanding the behaviour of isolated quantum systems far from equilibrium and their equilibration is one of the most pressing problems in quantum many-body physics1,2. There is strong theoretical evidence that sufficiently far from equilibrium a wide variety of systems—including the early Universe after inflation3,4,5,6, quark–gluon matter generated in heavy-ion collisions7,8,9, and cold quantum gases4,10,11,12,13,14—exhibit universal scaling in time and space during their evolution, independent of their initial state or microscale properties. However, direct experimental evidence is lacking. Here we demonstrate universal scaling in the time-evolving momentum distribution of an isolated, far-from-equilibrium, one-dimensional Bose gas, which emerges from a three-dimensional ultracold Bose gas by means of a strong cooling quench. Within the scaling regime, the time evolution of the system at low momenta is described by a time-independent, universal function and a single scaling exponent. The non-equilibrium scaling describes the transport of an emergent conserved quantity towards low momenta, which eventually leads to the build-up of a quasi-condensate. Our results establish universal scaling dynamics in an isolated quantum many-body system, which is a crucial step towards characterizing time evolution far from equilibrium in terms of universality classes. Universality would open the possibility of using, for example, cold-atom set-ups at the lowest energies to simulate important aspects of the dynamics of currently inaccessible systems at the highest energies, such as those encountered in the inflationary early Universe.

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Language(s): eng - English
 Dates: 2018-05-302018-09-282018-11-072018-11-08
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/s41586-018-0667-0
arXiv: 1805.12310
 Degree: -

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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: 5 Volume / Issue: 563 (7730) Sequence Number: - Start / End Page: 225 - 229 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238