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arXiv · 2302.10737

Quantum kinetics of quenched two-dimensional Bose superfluids

Clément Duval·Nicolas Cherroret
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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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Clément Duval, Nicolas Cherroret. 2023-02-21. Quantum kinetics of quenched two-dimensional Bose superfluids. https://doi.org/10.1103/physreva.107.043305

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