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arXiv · 2510.23600

Coupling-induced universal dynamics in bilayer two-dimensional Bose gases

En Chang·Vijay Pal Singh·Abel Beregi·Erik Rydow·Ludwig Mathey·Christopher J. Foot·Shinichi Sunami
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Abstract

The emergence of order in many-body systems and the associated self-similar dynamics governed by dynamical scaling laws is a hallmark of universality far from equilibrium. Measuring and classifying such nontrivial behavior for novel symmetry classes remains challenging. Here, we realize a well-controlled interlayer coupling quench in a tunable bilayer two-dimensional Bose gas, driving the system to an ordered phase. We observe robust self-similar dynamics and a universal critical exponent consistent with diffusion-like coarsening, driven by vortex and antivortex annihilation induced by the interlayer coupling. Our results extend the understanding of universal dynamics in many-body systems and provide a robust foundation for quantitative tests of nonequilibrium effective field theories.

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En Chang, Vijay Pal Singh, Abel Beregi, Erik Rydow, Ludwig Mathey, Christopher J. Foot, Shinichi Sunami. 2025-10-27. Coupling-induced universal dynamics in bilayer two-dimensional Bose gases. https://arxiv.org/abs/2510.23600

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