- Letter
Anomalous Landau damping and algebraic thermalization in two-dimensional superfluids far from equilibrium
Phys. Rev. A 111, L021301 – Published 5 February, 2025
DOI: https://doi.org/10.1103/PhysRevA.111.L021301
Abstract
We present a quantitative description of the thermalization dynamics of two-dimensional (2D) Bose superfluids far from equilibrium. Our analysis leverages a quantum kinetic formalism and allows us to identify two successive regimes of relaxation: an initial damping of quasiparticles due to Landau scattering processes, followed by the slower establishment of equilibrium at long time. For an initial state far from equilibrium, we find that Landau damping differs from the conventional picture of exponentially relaxing quasiparticles. Moreover, our results showcase a pronounced mechanism of slow algebraic transport at late times, rooted in energy conservation. Using theoretical and numerical arguments, we construct a detailed dynamical portrait of thermal equilibration in 2D superfluids.
