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  • Letter
  • Open Access

Resonance triplet dynamics in the quenched unitary Bose gas

J. van de Kraats1,*, D. J. M. Ahmed-Braun1, V. E. Colussi2,3, and S. J. J. M. F. Kokkelmans1

  • 1Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands
  • 2Infleqtion, Inc., 3030 Sterling Circle, Boulder, Colorado 80301, USA
  • 3Pitaevskii BEC Center, CNR-INO and Dipartimento di Fisica, Universitá di Trento, 38123 Trento, Italy

  • *Corresponding author: j.v.d.kraats@tue.nl
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Phys. Rev. Research 6, L012056 – Published 11 March, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L012056

Abstract

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.

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Phys. Rev. Research 6, L012056– Published 11 March, 2024
  • Received 8 September 2023
  • Revised 8 November 2023
  • Accepted 11 December 2023
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