Universal dynamics of a turbulent superfluid Bose gas

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Abstract
We study the emergence of universal scaling in the time-evolving momentum distribution of a harmonically trapped three-dimensional Bose-Einstein condensate, parametrically driven to a turbulent state. We demonstrate that the out-of-equilibrium dynamics post excitation is described by a single function due to nearby nonthermal fixed points. The observed behavior connects the dynamics of a quantum turbulent state to several far-from-equilibrium phenomena. We present a controllable protocol to explore universality in such systems, obtaining the associated scaling exponents. Our experimental results thus offer a promising route to investigate the complex dynamics of the quantum turbulent regime.
Funding Information
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (2013/07276-1, 2014/50857-8, 2017/09390-7, 2018/09191-7)
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (465360/2014-9, 142436/2018-6)

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