# Quantum kinetics of quenched two-dimensional Bose superfluids

Source: [Quantum kinetics of quenched two-dimensional Bose superfluids](<https://www.sota2.com/research/paper/68fa44191e209131ce90eb41>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T04:20:12.606Z

Authors: Cl\\'ement Duval, Nicolas Cherroret

Published: 2023-02-21T15:39:49.000Z

## Abstract

We study theoretically the non-equilibrium dynamics of a two-dimensional (2D) uniform Bose superfluid following a quantum quench, from its short-time (prethermal) coherent dynamics to its long-time thermalization. Using a quantum hydrodynamic description combined with a Keldysh field formalism, we derive quantum kinetic equations for the low-energy phononic excitations of the system and characterize both their normal and anomalous momentum distributions. We apply this formalism to the interaction quench of a 2D Bose gas and study the ensuing dynamics of its quantum structure factor and coherence function, both recently measured experimentally. Our results indicate that in two dimensions, a description in terms of independent quasi-particles becomes quickly inaccurate and should be systematically questioned when dealing with non-equilibrium scenarios.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2302.10737>)

[PDF](<https://arxiv.org/pdf/2302.10737.pdf>)