Resonance triplet dynamics in the quenched unitary Bose gas

J. van de Kraats (Corresponding author), D.J.M. Ahmed-Braun, V.E. Colussi, S.J.J.M.F. Kokkelmans

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The quenched unitary Bose gas is a paradigmatic example of a strongly interacting out-of-equilibrium quantum system, whose dynamics become difficult to describe theoretically due to the growth of non-Gaussian quantum correlations. We develop a conserving many-body theory capable of capturing these effects, allowing us to model the postquench dynamics in the previously inaccessible time regime where the gas departs from the universal prethermal stage. Our results show that this departure is driven by the growth of strong lossless three-body correlations, rather than atomic losses, thus framing the heating of the gas in this regime as a fully coherent phenomenon. We uncover the specific few-body scattering processes that affect this heating and show that the expected connection between the two-body and three-body contacts and the tail of the momentum distribution is obscured following the prethermal stage, explaining the absence of this connection in experiments. Our general framework, which reframes the dynamics of unitary quantum systems in terms of explicit connections to microscopic physics, can be broadly applied to any quantum system containing strong few-body correlations.

Originele taal-2Engels
Aantal pagina's7
TijdschriftPhysical Review Research
Nummer van het tijdschrift1
StatusGepubliceerd - mrt. 2024


Acknowledgments. We thank Silvia Musolino for fruitful discussions. J.v.d.K. and S.J.J.M.F.K. acknowledge financial support from the Dutch Ministry of Economic Affairs and Climate Policy (EZK), as part of the Quantum Delta NL program. D.J.M.A.-B. acknowledges financial support from the Netherlands Organisation for Scientific Research (NWO) under Grant No. 680-47-623. V.E.C. acknowledges financial support from the Provincia Autonoma di Trento, the Italian MIUR under the PRIN2017 projectCEnTraL, and from the National Science Foundation (NSF) under Grant No. PHY-1748958.

Provincia Autonoma di Trento
Italian Ministero dell’ Istruzione, Università e Ricerca
Ministerie van Economische Zaken en Klimaat
Nederlandse Organisatie voor Wetenschappelijk Onderzoek680-47-623
National Science Foundation(NSF)PHY-1748958


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