Anomalous Landau damping and algebraic thermalization in two-dimensional superfluids far from equilibrium

• URL: http://arxiv.org/abs/2405.08606v1
• Date: Tue, 14 May 2024 13:43:20 GMT
• Title: Anomalous Landau damping and algebraic thermalization in two-dimensional superfluids far from equilibrium
• Authors: Clément Duval, Nicolas Cherroret,
• Abstract summary: We study the thermalization dynamics of far-from-equilibrium, two-dimensional (2D) Bose superfluids. For a far-from-equilibrium initial state, we find that Landau damping differs from the conventional picture of exponentially relaxing quasi-particles.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a quantitative description of the thermalization dynamics of far-from-equilibrium, two-dimensional (2D) Bose superfluids. Our analysis leverages a quantum kinetic formalism and allows us to identify two successive regimes of relaxation: an initial damping of quasi-particles due to Landau scattering processes, followed by the slower establishment of a global equilibrium at long time. For a far-from-equilibrium initial state, we find that Landau damping differs from the conventional picture of exponentially relaxing quasi-particles. Moreover, our results showcase a pronounced mechanism of algebraic transport at late times, rooted in energy conservation and compatible with 2D diffusion. Using theoretical and numerical arguments, we construct a detailed dynamical portrait of global equilibration in 2D superfluids.

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