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Decay and recurrence of non-Gaussian correlations in a quantum many-body system
ID Schweigler, Thomas (Author), ID Sotiriadis, Spyros (Author), et al.

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Abstract
Gaussian models provide an excellent effective description of many quantum many-body systems ranging from condensed-matter systems all the way to neutron stars. Gaussian states are common at equilibrium when the interactions are weak. Recently it was proposed that they can also emerge dynamically from a non-Gaussian initial state evolving under non-interacting dynamics. Here we present the experimental observation of such a dynamical emergence of Gaussian correlations in a quantum many-body system. This non-equilibrium evolution is triggered by abruptly switching off the effective interaction between the observed collective degrees of freedom, while leaving the interactions between the microscopic constituents unchanged. Starting from highly non-Gaussian correlations, consistent with the sine–Gordon model, we observe a Gaussian state emerging over time as revealed by the decay of the fourth- and sixth-order connected correlations in the quantum field. A description of this dynamics requires a novel mechanism for the emergence of Gaussian correlations, which is relevant for a wide class of quantum many-body systems. In our closed system with non-interacting effective degrees of freedom, we do not expect full thermalization. This memory of the initial state is confirmed by observing recurrences of non-Gaussian correlations.

Language:English
Keywords:statistical physics, quantum mechanics
Typology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Publication status:Published
Publication version:Author Accepted Manuscript
Year:2021
Number of pages:Str. 559-563
Numbering:Vol. 17, iss. 5
PID:20.500.12556/RUL-132290 This link opens in a new window
UDC:530.145
ISSN on article:1745-2473
DOI:10.1038/s41567-020-01139-2 This link opens in a new window
COBISS.SI-ID:62640131 This link opens in a new window
Publication date in RUL:20.10.2021
Views:665
Downloads:210
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Record is a part of a journal

Title:Nature physics
Publisher:Nature Pub.
ISSN:1745-2473
COBISS.SI-ID:23900455 This link opens in a new window

Secondary language

Language:Slovenian
Keywords:statistična fizika, kvantna mehanika

Projects

Funder:EC - European Commission
Funding programme:H2020
Project number:694544
Name:Open Many-body Non-Equilibrium Systems
Acronym:OMNES

Funder:ARRS - Slovenian Research Agency
Project number:N1-0109
Name:Kvantni sunki, transport in prepletenost v neravnovesnih enodimenzionalnih kvantnih sistemih

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